highaltitude.log.20150324

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[00:08] <jonsowman> hi ejcweb!
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[02:13] <Oddstr13> 1/4"
[02:13] <Oddstr13> where is that bot when it is needed? :P
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[02:22] <Ian_> 1/4" is 6.35mm 25.4mm / 4
[02:33] <Oddstr13> yea, I asked wolframalpha :P
[02:36] Action: Oddstr13 pulls out his RTL-SDR
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[02:37] <Oddstr13> let's see if 2 transistors are enough for letting magic smoke loose.
[02:50] <Oddstr13> meh, probably wired something incorrectly
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[05:40] Nick change: fl_0|afk -> fl_0
[05:41] <fl_0> morning folks
[05:49] <Vaizki> morning
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[06:04] <SA6BSS-Mike> morn
[06:21] <Vaizki> Russia not pitchibg in on the D-7 tracking I see
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[06:53] <Reb-SM0ULC> morrn
[07:10] <fl_0> yes, last pos was near estonia
[07:10] <fl_0> there are a few SDRs in Moscow
[07:10] <fl_0> but not a single one with a 70cm RX
[07:10] <fl_0> :(
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[08:16] <Vaizki> I'm guessing if 70cm is pretty messy with random VHF stuff here in Finland it must be ^2 in Moscow...
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[09:11] <amell> DL7AD: relaunch with APRS code this time? :)
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[09:20] <Babs____> Morning all - question on antenna length. As long as there is a length of shielded coax between the antenna and the transmitter, for the purposes of measuring the length of the antenna I can ignore the length of the pcb trace from transmitter to coax (ie it does not form part of the antenna). Correct?
[09:20] <Babs____> If no coax is there , do I need to account for the trace length and then worry it's straight etc?
[09:20] <pc1pcl> second point yes, first point is 'complicated'
[09:21] <pc1pcl> basically the first case the little trace is also an antenna.
[09:21] <Vaizki> but just off tune by a whooooole lot
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[09:21] <pc1pcl> but if it is a very inefficient (too short) antenna, it won't matter too much
[09:21] <Babs____> Ok
[09:22] <pc1pcl> also, the coax length also matters..
[09:22] <pc1pcl> certain lengths of coax work as a filter.
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[09:25] <craag> err wat
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[09:26] <Vaizki> google coax stub notch filter
[09:26] <Babs____> Ok - so I have 30mm of trace (presume very safe from that point of view) , a few cm of coax then the antenna - it doesn't sound as if it would cause any particular problems
[09:26] <craag> that's for stubs...
[09:26] <craag> He's talking about tx -> antenna
[09:27] <Vaizki> oh right sorry
[09:27] <Vaizki> need coffee
[09:27] <Vaizki> and read back more than 3 lines
[09:27] <craag> Babs____: If the pcb trace is on a groundplane - you can completely ignore it.
[09:28] <craag> Sounds totally fine
[09:28] <Babs____> Craag - it runs through a ground plane but is isolated from it
[09:28] <pc1pcl> craag: at balloon scale a short bit of coax to connect TX > antenna might happen to end up to be 'stub filter'
[09:29] <craag> Babs____: Yep that's good :)
[09:29] <Babs____> Ok great thanks for your help. Awesome.
[09:30] <Babs____> In the hot dog form
[09:30] <Babs____> (C) Eddie Izzard
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[09:32] <craag> pc1pcl: My understanding is that a stub filter requires an impedance mismatch at the end to function (ie either short- or open-circuit)
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[09:37] <pc1pcl> craag: unfortunately the typical hab antenna probably isn't perfectly 50 Ohm impedance, so you'll get that for free..
[09:38] <pc1pcl> But, there are so many variables that can cancel out or interfer constructively,
[09:38] <craag> Yep - but it'd have to be very bad to have any real effect
[09:38] <craag> At which point the mismatch reflection is probably costing you more in ERP
[09:39] <pc1pcl> yeah, just put something together and if it doesn't work 'well enough', then start tweaking stuff.
[09:39] <Vaizki> I lack so much in theory that I simply intend to test something and see if it works...
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[10:12] <infaddict> Interesting chat guys. In my payload box I will have approx 15cm between my PCB's SMA connector and coming out the bottom of the payload box. I intend to measure my antenna length from bottom of payload boad.
[10:12] <infaddict> Therefore interested if thats correct and what impact that 15cm of coax inside the payload might have
[10:12] <infaddict> boad/box
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[10:17] <Vaizki> infaddict, got my first decodes ever last night off D-7.. DomEx22.. only 120km away though.
[10:17] <Vaizki> now I need more floaters my way to practise ;)
[10:17] <edmoore> infaddict, it should have basically no impact
[10:18] <infaddict> great news Vaizki! big moment!
[10:18] <infaddict> thx edmoore, thats good to hear
[10:18] <edmoore> the loss of coax is measured in dB/unit_length and is a function of the quality of the coax and the frequency you're sending down it - losses increase with frequency
[10:18] <edmoore> but 15cm at a low freq like 434MHz will be basically negligible
[10:18] <infaddict> right. i have decent coax i think.
[10:18] <edmoore> if you wanted to send 5GHz down 10m of coax then i'd start worrying
[10:19] <infaddict> mmm
[10:19] <edmoore> but in this case you'll be absolutely gravey
[10:19] <infaddict> nice one. slowly edging towards actually building up my payload box and antenna.
[10:19] <edmoore> coolio!
[10:20] <edmoore> make sure the antenna can take a beating
[10:20] <infaddict> and the big day of deciding what parachute and balloon i need!
[10:20] <infaddict> yer i've seen ideas of putting the antenna in a plastic straw
[10:20] <daveake> That's normally launch day :p
[10:20] <edmoore> people sometimes make it out of free-dangling solid-core wire so it just gets permentantly bent out of shape when you have a messy release at launch and catch it on your hand
[10:20] <edmoore> and then have a devil of a time tracking as a result
[10:20] <edmoore> the guitar wire people advocate is good
[10:21] <infaddict> yep daveake... my stock levels aren't big enough to hold several options so hoping i can pick an all rounder
[10:21] <edmoore> i put one in some of that domestic pipe lagging foam once
[10:21] <edmoore> lemme find a piccy
[10:21] <daveake> infaddict Yes, it's a luxury that those of us who do launch a lot do have
[10:21] <edmoore> infaddict, that's the last box i did: https://www.flickr.com/photos/cuspaceflight/4721971075/in/set-72157624203062811
[10:22] <daveake> fine-tuning of where you want the thing to land
[10:22] <edmoore> ignore the draper cardboard box, that's nowt to do with the payload
[10:22] <edmoore> but you can see the antenna is in the foam lagging, and the radial elements were heatshrunk onto thicking cable ties to provide some rigidity
[10:23] <infaddict> yep - so the foam didnt impact the signal?
[10:23] <daveake> nope
[10:23] <edmoore> nope
[10:23] <edmoore> it's basically just air
[10:23] <infaddict> nice idea. good protection, including if it hits someone lol
[10:24] <edmoore> also note in that album the really sexy parachute
[10:24] <edmoore> yes that's my design criteria
[10:24] <daveake> Without the foam you may have the payload flattening the aerial
[10:24] <edmoore> if it landed on my head as i looked up, would i be sad
[10:24] <edmoore> and then as a follow-up, if it lands antenna-down, are we screwed
[10:24] <edmoore> answer must be no in both cases
[10:25] <edmoore> this is that parachute deployed: http://aeroconsystems.com/cart/images/products/secondary/par72-3.jpg
[10:25] <infaddict> so what was the antenna made of, and what were your radials made from?
[10:25] <edmoore> just 22awg multicore wire
[10:25] <edmoore> in both cases
[10:25] <infaddict> cool i have loads of that
[10:25] <edmoore> yep
[10:25] <infaddict> nice chute!
[10:25] <daveake> last one I used kitchen foil for the gp
[10:26] <edmoore> yeah i was hoping that the silver-lined insulation i used would couple with the ground plane
[10:26] <edmoore> to help it
[10:26] <edmoore> i have strong opinions about wire if you ever get bored
[10:26] <edmoore> can recommend different types for different things
[10:27] <edmoore> especially aerospace apps
[10:27] <infaddict> so did you have a "sheet" type of ground plane as well as radials?
[10:27] <edmoore> it's totally optional but yes you can
[10:28] <edmoore> basically the ground plane is a theoretical construct - a perfectly conductive plane that goes infinitely far in all directions
[10:28] <edmoore> we can't build that so we approximate
[10:28] <infaddict> oki doki thanks. so should i use coax from PCB down to base of payload, then solder on the normal wire for antenna and radials?
[10:28] <daveake> nope
[10:28] <edmoore> and it turns out that 4 20cm radials is like 96% as good as the theoretical infinite plane
[10:28] <daveake> solder = nreaky bit
[10:28] <daveake> breaky
[10:28] <infaddict> ok
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[10:28] <edmoore> yeah i built a separate antenna onto an sma
[10:29] <edmoore> and screwed that in
[10:29] <edmoore> it was a bulkhead sma and i attached the radials to the bulkhead
[10:29] <infaddict> yep so my PCB has a SMA connector. So i need to understand best way to get from that to antenna/radials
[10:29] <edmoore> and the radiating element to the inner conductor
[10:29] <edmoore> i don't actually have a problem with soldering it
[10:29] <fsphil> anyone know where to get a good right angle sma plug?
[10:30] <edmoore> just make sure it's strain-relieved
[10:30] <edmoore> i.e. don't used the solder as a mechanical connection, just an electrical one
[10:30] <edmoore> fsphil, farnell?
[10:30] <infaddict> i guess hot glue can help with solder joints. but what are other options? good old mech connection?
[10:30] <edmoore> you could have a small square of material
[10:30] <edmoore> like copper-clad pcb
[10:30] <edmoore> and drill a hole through the middle
[10:31] <edmoore> then solder the coax braid to the copper and tha radials also to the copper
[10:31] <edmoore> but also put some cable clamps on the copper to hold down the radials
[10:31] <edmoore> then solder your radiating element to the inner core of the coax
[10:31] <edmoore> maybe a sketch would help
[10:33] <infaddict> yep that would certainly help me. i need to google some other pics of how people have done this too.
[10:34] <fsphil> the last 90deg one I got, the little round cover didn't seem to fit well
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[10:38] <mattbrejza> we have had an antenna element fall off due to a solder joint
[10:38] <mattbrejza> that was embarrassing
[10:38] <mattbrejza> thankfully only the backup, now we just use the centre part of the coax itself as the element
[10:39] <fsphil> I think that happened on my second flight
[10:39] <fsphil> I've a rule since then that the main element should never be soldered
[10:39] <mattbrejza> on the other hand it made for good yagi direction finding
[10:39] <fsphil> just use the coax
[10:40] <edmoore> soldering id fine
[10:40] <edmoore> it's just not mechanical
[10:40] <edmoore> a bit like making up a connector
[10:40] <edmoore> strain relief should be mechanical and done elsehwre
[10:40] <fsphil> yes if I'd had some shrink over it, might've survived
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[10:41] <mattbrejza> there wasnt even any flexible part of the coax free to flex which made it worse
[10:41] <gonzo_> on sats they silicone down the wires, to the pcbs, a little way from the solder joints
[10:41] <infaddict> fsphil: i guess it has to be soldered or connected at some point (to main board or a connector)
[10:41] <edmoore> ok this is not a great sketch but https://www.dropbox.com/s/woraimnir34az6u/2015-03-24%2010.40.22.jpg?dl=0
[10:41] <infaddict> as you say, maybe key is strain relief on whatever joins there is
[10:42] <gonzo_> also they use clip over heat sinks on the wires, to prevent the solder wicking too far up, when you make the joint
[10:42] <fsphil> my radials get installed under the duct tape too
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[10:43] <fsphil> gonzo_: good idea
[10:43] <edmoore> but yes in my payload photo everything mechanical was done with heatshrunk onto a structure
[10:43] <gonzo_> Though habs don't gtet anywhere like the abuse of a sat
[10:44] <fsphil> satellites rarely land though
[10:44] <fsphil> and even fewer have to continue to operate :)
[10:44] <mattbrejza> is the copper-clad then glued to the coax outer-insulation?
[10:44] <gonzo_> if you wanted to test your hab to the levels of a sat, you would need to put it in the tumble dryer for 5min
[10:45] <gonzo_> explorer1 ??
[10:46] <gonzo_> didn't that land and start transmitting. Though it didn't quite reach orbit. just fell off the launcher on an aborted liftoff
[10:46] <fsphil> it always surprised me the big heavy connectors that spacecraft used. but I suppose they must to survive testing
[10:46] <edmoore> are they that big?
[10:47] <edmoore> usually they're just those v spendy micro-D things i thought
[10:47] <fsphil> there's a picture of Huygens with some big D plugs, trying to find that
[10:50] <fsphil> hmm don't see it
[10:51] <edmoore> bbiab
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[11:57] <daveake> nice gentle second landing :-) https://youtu.be/AVLmMxirqV0
[12:02] <infaddict> lovely!
[12:02] <Vaizki> sound track needs a foley artist
[12:03] <Geoff-G8DHE-Lap> Looks good!
[12:03] <Geoff-G8DHE-Lap> Did you work out what stopped the pictures being sent ?
[12:04] <daveake> on the case
[12:06] <Vaizki> which payload was this?
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[12:12] <number10> Vaizki: one launch last Friday
[12:13] <Vaizki> yes but which one, I thought most of them were lost to sea / lake?
[12:14] <Pcal> Hi I'm very new to HAB and really could do with some help with DL-Fldigi. No matter what I do I cannot seem to tune it correctly and get gibberish coming through. I've been trying for over a week now! Could anyone please help me? Thanks
[12:15] <Vaizki> hi, screenshot would help hugely
[12:15] <Vaizki> up it on imgur for example
[12:15] <number10> it was daveake multiple one from leicester - Buzz MARVIN rimmer etc
[12:15] <Pcal> How would i show you a screen shot?
[12:16] <Vaizki> number10, ah ok thanks
[12:17] <Vaizki> I did try to track Buzz & Marvin via amell's radio but no luck, sending raw i/q over internet was a bad idea
[12:17] <amell> dont know unless you try :)
[12:18] <Pcal> Hi Vaizki - how do i post a screenshot?
[12:19] <Vaizki> amell, true...
[12:20] <Pcal> oh - got to log out - i'll be back later
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[12:20] <Vaizki> oh well...
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[12:33] <Pcal> Hi - is there anyone who could help with DL-fldigi
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[12:35] <Pcal> Hello - anyone?
[12:35] <Vaizki> yes we can
[12:35] <Vaizki> patience please
[12:35] <Vaizki> and screenshot
[12:35] <DL7AD> Vaizki: "yes we can" is reserved :P
[12:36] <Vaizki> oh sorry :)
[12:36] <Pcal> Thank you. How would i post a screenshot?
[12:37] <Geoff-G8DHE-Lap> to any sie you have access to or say imgur.com
[12:37] <Geoff-G8DHE-Lap> site*
[12:38] <Vaizki> gyazo.com is one option also
[12:38] <Pcal> No - But I do with photobucket
[12:38] <Vaizki> photobucket is ok
[12:38] <Geoff-G8DHE-Lap> also what program or device are you feeding dl-fldigi from ?
[12:39] <Pcal> At the moment I am using a sound file that someone posted. But at home I'm using SDR#
[12:40] <Geoff-G8DHE-Lap> what sort of problem are you having then ?
[12:42] <Vaizki> https://getsharex.com/
[12:42] <Vaizki> that one seems to work great for imgur upload
[12:42] <Vaizki> GPL too
[12:43] <Pcal> I can see the signal but just cannot get it tuned. I just get gibberish
[12:43] <Geoff-G8DHE-Lap> OK lets see the screen grab then.
[12:44] <Geoff-G8DHE-Lap> what is the sound file from or of ?
[12:44] <Pcal> Okay - this was a bit silly because I'm at work and have to leave the office now for about half an hour. I'll try and get a screenshot sorted then come back
[12:45] <Pcal> From a flight someone did.
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[12:46] <Pcal> thanks everyone, though, be back later
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[14:36] <Maxell> Vaizki: sharex looks nice. Open Source/GPLjihad compatible alternative :)
[14:36] Action: Maxell hands out more Free Software
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[14:45] <Vaizki> Maxell, indeed.. good thing pcal asked, got me googling
[14:52] <amell> gah, my 3d print of the last 2 hours is ruined. The dog got tangled up in the filament :(
[15:01] <staylo> Common problem. Last time I try to 3D print a kennel.
[15:03] <edmoore> kennel hacking
[15:06] <gonzo_> would it not be better to print the basket, THEN put the dog in it?
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[15:49] <Ian_> edmoore , your [ 10:41 ] is a great diagram.
[15:50] <edmoore> ?
[15:50] <SpeedEvil> 10:41] <edmoore> ok this is not a great sketch but https://www.dropbox.com/s/woraimnir34az6u/2015-03-24%2010.40.22.jpg?dl=0
[15:51] <Ian_> That's the one, but it did the business as far as I can see.
[15:51] <edmoore> ah righty
[15:51] <edmoore> ta
[15:51] <SpeedEvil> :)
[15:51] <Ian_> Well up to the Edmoore attention to detail standard that we have come to expect ;)
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[16:01] <Laurenceb> how i do it
[16:01] <Laurenceb> http://emcesd.com/tt2010/tt080410.htm
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[17:39] <Lunar_Lander> evening
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[17:52] <mbales_> ahoy hoy
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[18:22] <Vaizki> not so sure about this hab thing any more.. getting to know RF and SDR is starting to look like an expensive addition to my hobbies...
[18:23] <Laurenceb> http://www.bbc.co.uk/news/technology-32033766
[18:23] <Laurenceb> interesting
[18:23] Action: Vaizki is bidding on a Rohde & Schwarz signal analyzer
[18:24] <myself> ooh, which one?
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[18:24] <Vaizki> FSV
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[18:25] <infaddict> so can we use bees to guide us to the payload ;-/
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[18:28] <myself> that looks expensive
[18:29] <myself> I'm looking at a CMU200, since the GPRF functionality includes a spec-an that goes to 2.7GHz, which covers everything I'm interested in
[18:29] <Vaizki> yea well it's at 770 euros now..
[18:29] <myself> oh and it's also a signal generator, and oh it's also a GSM cellsite emulator :P
[18:29] <myself> not bad
[18:29] <Vaizki> I know.. they also have CMW 500 units...
[18:29] <Vaizki> but they go for more like 10k
[18:29] <Vaizki> or 30k :)
[18:30] <Vaizki> I am also considering an older cellular analyzer
[18:30] <Vaizki> they get outdated with new LTE etc coming in so the old stuff gets moved out
[18:30] <Vaizki> like the CMU 200
[18:31] <Vaizki> a friend of mine has a CMU 200 and he can't stop frothing about it ;)
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[18:31] <myself> Exactly. I have a CMW500 on my bench at work, actually my laptop is rubbing against it right now.
[18:32] <myself> Hence the CMU200's being cheap on ebay ;)
[18:32] <myself> The CMW hardware with LTE options is well over $300,000, it's mindboggling
[18:32] <Vaizki> cmw 500 is something like 90k usd new with the usual options?
[18:33] <Vaizki> ehehe
[18:33] <Vaizki> indeed it is
[18:33] <myself> that would be just the hardware, no software
[18:33] <myself> 90k might get you just the box. heh.
[18:33] <Vaizki> or both my cars.. twice.
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[18:35] <Vaizki> myself: if I got a CMU 200, how much would it run me on ebay?
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[18:36] <Vaizki> I'm sure you have a handle on the prices :)
[18:36] <myself> Roughly $1200 nicely equipped, $2000 recently calibrated.
[18:37] <Vaizki> oh ok so not a bad price
[18:37] <Vaizki> it is like a lab in a box I guess
[18:37] <myself> There's been a broken one for $600 that I'm really tempted to pick up because it sounds like a power supply failure
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[18:38] <Vaizki> cmu 200's are at 20 euros each with 20 hours remaining in this auction I'm on ;)
[18:38] <myself> Feel like shipping one to the US? ;)
[18:38] <Vaizki> I expect them to shoot up in price
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[19:26] <Reb-SM0ULC> evevning
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[19:34] <Pcal> Heelo I was hoping some one could help me with dl-fldigi. I'm using it with SDR# and have been trying for 3 x days but can't tune dl-fldigi to the signal
[19:35] <Reb-SM0ULC> how do you mean tune?
[19:35] <Vaizki> hello again, just like last time we'd like to see a screenshot
[19:35] <Pcal> okay i have one uploaded to shareX... how do I send it to you?
[19:36] <mikestir> just paste one into imgur.com
[19:36] <Vaizki> sharex will upload it automatically to imgur
[19:37] <Vaizki> just select it from the list to open it in imgur, then copy the url from the browser for us
[19:37] <Pcal> okay - i'll have a look... thanks
[19:38] <Pcal> here you are... http://imgur.com/xiiRPnY,8Lt17wh
[19:39] <Vaizki> whoaa that's not right at all
[19:39] <mikestir> now do one of sdr#
[19:39] <Reb-SM0ULC> wow
[19:39] <Pcal> there is one there... click on second image
[19:39] <Vaizki> yea something wrong with SDR# side of things
[19:40] <Reb-SM0ULC> that's one pic for a toplist :)
[19:40] <Pcal> okay do you know what.?
[19:41] <mikestir> need to see the demod settings
[19:41] <Vaizki> so is that playback of a recorded i/q file?
[19:41] <Vaizki> or playback of a recorded audio file
[19:41] <Vaizki> or live data from SDR
[19:41] <Pcal> no i've got a Rpi and PITS board running upstairs
[19:41] <Pcal> live data
[19:42] <Vaizki> and yes, scroll the left pane in sdr# to the top
[19:42] <mikestir> how are you looping the audio from sdr# to fldigi?
[19:43] <Pcal> hang on will just upload the top pic
[19:43] <Vaizki> and make sure you have squelch, unity gain, filter audio etc all off in sdr#
[19:44] <Pcal> okay - i'll read what you said.. here's the pic.. http://imgur.com/Shyrv1M
[19:45] <Pcal> through the virtual cable
[19:45] <mikestir> in that last screenshot you've got the marker too close to the centre of the signal
[19:46] <Vaizki> ok well that looks almost good but your filter is not capturing the signal
[19:46] <mikestir> you need to move it a bit to the left so that the middle of the signal is near the middle of the light blue bar
[19:46] <Pcal> okay
[19:47] <Vaizki> and I tend to set my bandwidth to 4000, then set in fl-digi waterfall options -> fft processing the upper limit also to 4000
[19:47] <Vaizki> that way you get a 4kHz slice from sdr# to fldigi
[19:48] <Pcal> i'll try that because it still looks a mess
[19:49] <Vaizki> https://dl.dropboxusercontent.com/u/367935/vzk-1%20tracker.png
[19:49] <Vaizki> that's from a different SDR program but you can see the filter covering both peaks
[19:49] <Vaizki> and you can see the fldigi waterfall
[19:49] <Vaizki> although in that one I have a smaller bandwidth than 4000....
[19:51] <Pcal> did what you said. the waterfall extended in dl-fldigi but still looks the same
[19:51] <Vaizki> and in dl-fldigi you need to click off SQL (squelch) but first get the waterfall right
[19:51] <Vaizki> do you have dl-fldigi configured to get audio from the virtual cable?
[19:52] <Pcal> yes
[19:53] <Pcal> told you... it's driving me nuts!
[19:53] Nick change: fl_0|afk -> fl_0
[19:53] <mikestir> have you got the levels up far too high maybe?
[19:53] <Pcal> which levels/
[19:53] <mikestir> does VAC even have level controls? (I use linux)
[19:53] <Vaizki> well he has the green diamond in dl-fldigi at least...
[19:53] <fl_0> re
[19:53] <Vaizki> and sdr# audio gain (slider next to freq display) is quite low
[19:53] <Pcal> i tried changing the sound levels
[19:53] <fl_0> any news from D-7 btw?
[19:54] <mikestir> does it sound right out of the speakers?
[19:54] <Reb-SM0ULC> Pcal: reduce the gain on the dongle ?
[19:54] <Pcal> D-7?
[19:54] <Vaizki> Pcal: d-7 is a balloon we tracked yesterday
[19:54] <Pcal> oh sorry
[19:54] <Vaizki> went into russia last night
[19:55] <Pcal> how do i reduce the gain on the dongle?
[19:55] <Pcal> cool
[19:55] <Vaizki> press the gear-icon on the toolbar of sdr#
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[19:56] <Pcal> okay pressing gear icon
[19:56] <Pcal> do you mean thr RF gain?
[19:56] <Vaizki> yes
[19:56] <Vaizki> what is it at?
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[19:57] <Pcal> now it's 2.7db
[19:57] <Vaizki> almost down to minimum on the slider then?
[19:57] <Pcal> there is a bit more blue on the waterfall
[19:57] <Pcal> yes almost
[19:58] <Vaizki> hmmh so very little gain there also
[19:58] <Pcal> yes
[19:59] <mikestir> what baud is it? 300?
[19:59] <Pcal> yes 300 and on the configuration for the PITS board
[19:59] <mikestir> so what does it actually sound like out of sdr#?
[19:59] <Reb-SM0ULC> Pcal: new screenshot?
[19:59] <mikestir> it should sound a bit like on old dial up modem
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[20:00] <Pcal> I hhaven't listened but i will.. i've listed to recordings so know what it should sound like... i'll do another screen shot first though
[20:00] <Vaizki> https://www.youtube.com/watch?v=gcgYLGugMpI
[20:01] <Vaizki> something like that
[20:03] <Pcal> here you are.. i'll listen now and let you know.. http://imgur.com/TIJahwx
[20:04] <mfa298> it might be useful to see what sdr# looks like now as well,
[20:05] <mfa298> that still doesn't look like a good signal (from what daveake was saying the other day it sounds like PITS should have a shift of ~910Hz)
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[20:05] <Reb-SM0ULC> Pcal: you can get them both in same shot, show upper part of sdrsharp adn then fldigi in the lower part
[20:05] <mikestir> might be worth tuning around a bit in case that is actually a spurious. the rtlsdr could be quite a bit off frequency
[20:06] <Pcal> okay i'll do another
[20:07] <Pcal> it did say that... i'll change the shift first but the signal still look terrible
[20:08] <daveake> Doesn't even look like USB RTTY
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[20:09] <Pcal> here you are.. http://imgur.com/WDFlIVq
[20:09] <daveake> That doesn't make sense
[20:10] <fsphil> hehe
[20:10] <daveake> dl-fldigi should see what the selected section in SDR# shows
[20:10] <Vaizki> yea which is why I asked about soundcard config in dl-fldigi
[20:10] <fsphil> audio routing trouble
[20:10] <daveake> Do you have any bass boost or something going on ?
[20:10] <Reb-SM0ULC> weird with the straight lines in fldigi...
[20:10] <fsphil> that could be mic noise
[20:11] <Pcal> not that I know of
[20:11] <daveake> check it
[20:11] <Pcal> it looked the same listening to a recording
[20:11] <daveake> Just look in that SDR section
[20:11] <Vaizki> in fldigi, menu Configure-> Soundcard.. what is the capture device?
[20:11] <daveake> that has almost nothing at low frequencies
[20:12] <daveake> then look in dl-fldigi
[20:12] <daveake> you have loads beloiw 500Hz
[20:12] <daveake> Doesn't look right at all
[20:12] <Reb-SM0ULC> looks like a mic-input maybe
[20:12] <Pcal> capture devise SDR audio
[20:13] <Pcal> The mike is diabled in windows
[20:13] <daveake> hmmm
[20:13] <daveake> Normally it's SDR --> VAC
[20:13] <daveake> and VAC --> dl-fldigi
[20:13] <daveake> dunno about this SDR audio thing
[20:13] <Pcal> you've lost me now
[20:13] <daveake> Might be right but I've not done it that way
[20:14] <Vaizki> what are the options in the capture device selection
[20:14] <craag> Screenshot the soundcard selection options in dl-fldigi?
[20:14] <Pcal> okay
[20:14] <daveake> Well, someone else can comment about "SDR Audio" as a device
[20:14] <Vaizki> sdr audio might be a name given to a virtual cable endpoint?
[20:14] <craag> Could be trying to listen to the RF IQ stream :P
[20:14] <daveake> But the way I do it is to install VAC (Virtual Audio Cable)
[20:14] <fsphil> fldigi really does need an IQ input
[20:14] <daveake> then you create a VAC channel
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[20:14] <daveake> and you use that as the output to SDR#
[20:14] <daveake> and the input to dl-fldigi
[20:15] <Vaizki> I use VoiceMeeter, it creates an input and output device for you and gives a mixer also
[20:15] <Vaizki> basically same as VAC though
[20:15] <Pcal> audio setting...
[20:16] <Pcal> sorry.. http://imgur.com/aCl5jQ6
[20:16] <Pcal> yes i installed a VAC and renamed it SDR
[20:17] <Vaizki> try to select SDR without directsound
[20:17] <daveake> yes
[20:17] <Vaizki> so VAC as a windows "traditional" audio device
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[20:19] <Pcal> i'm lost now... I'm using VAC qoutput from SDR and the same for input to dl-fldigi
[20:19] <craag> You're currently using "Directsound => SDR(VAC)"
[20:20] <Vaizki> so in capture device, don't go to the Windows DirectSound devices submenu
[20:20] <craag> Try "SDR(VAC)"
[20:20] <Vaizki> just choose SDR (Vir...) on the top level
[20:20] <Pcal> okay
[20:20] <Pcal> no change
[20:20] <Vaizki> what are you running this on, a windows tablet?
[20:21] <Pcal> no win 7 laptop
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[20:21] <Pcal> does the signal in SDR look okay do you think?
[20:21] <Vaizki> might you be starved for CPU?
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[20:22] <Pcal> no... not running anything else
[20:22] <Vaizki> yes the signal in sdr# looks ok, it's running a bit "hot" (yellow-red) because of your range slider on the right of the waterfall
[20:23] <Vaizki> you can tweak the "range" slide to move the noise floor lower on the spectogram to get the non-signal areas blue but it won't change anything
[20:23] <Pcal> oh yes - put the range down - looks better but not in dl-fldigi
[20:24] <mfa298> are you able to record some audio from sdr# and post online, that way someone else (or several of us) could try listening and decoding and see if we get the same result in dl-fldigi
[20:24] <Vaizki> it is definitely looking like your audio is not getting to fldigi correctly
[20:24] <craag> Pcal: There should be multiple options for "SDR(VB-Audio)" in SDR# Audio Output, try selecting another one?
[20:24] <Pcal> okay
[20:25] <Vaizki> craag: he is using [MME] one
[20:25] <Vaizki> it was in an early screenshot
[20:25] <craag> Else: There's something wrong with your vac setup.
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[20:25] <Pcal> changed to SDR direct - no change
[20:25] <Vaizki> you can also take a physical cable and run it from your sound output jack to the input one
[20:26] <Vaizki> or you can record audio from sdr# and give it to us
[20:26] <Vaizki> as suggested
[20:26] <Pcal> I can try both... may take some time though
[20:26] <Vaizki> and also play it back yourself in dl-fldigi with File -> Audio -> Playback
[20:27] <Vaizki> craag:
[20:27] <Vaizki> oops
[20:27] <craag> hello :)
[20:27] <Vaizki> tab+enter
[20:27] <Pcal> okay... will give it a go
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[20:27] <Reb-SM0ULC> Pcal: maybe a first step and record audio in sdrsharp and put online so one can listen
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[20:41] <Pcal> don't know whats going on now - will have to re-boot. Chaned all my sound back to normal... recorded SDR but sounded different when i played it back... back soon
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[20:58] <Vaizki> well need to retire early today.. so g'nite...
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[21:01] <Pcal> Hi Back now. I used a cable from the headphone port to the mic port and this is what i've got.. SDR# http://imgur.com/4tTKc5o
[21:02] <Pcal> and dl-fldigi... http://imgur.com/5fb51NJ
[21:03] <daveake> much better
[21:03] <daveake> now set the filter width in dl-fldigi to auto
[21:03] <fl_0> re
[21:04] <Pcal> how do i do that dave?
[21:04] <daveake> rtty settings page
[21:05] <Pcal> k done that
[21:05] <Pcal> nothing not even gibberish
[21:06] <Pcal> oh okay - just got a red bar
[21:07] <SA6BSS> low volyme, diamond is black in right corner
[21:07] <Pcal> gibberish in the bar and bad checksum
[21:07] <SA6BSS> never mind
[21:07] <cambazz> hello daveake how are you?
[21:07] <SA6BSS> it should wotk anyway as signla is strong
[21:07] <cambazz> I am still playing with lora modules with no success.
[21:07] <cambazz> trying to get that frequency correction
[21:08] <Pcal> no change
[21:09] <daveake> What serial settings in rtty ?
[21:09] <Pcal> 300
[21:09] <daveake> note the plurality of my question
[21:10] <SA6BSS> 7n2 8n2 etc
[21:10] <Pcal> sorry 8
[21:11] <daveake> check against http://www.pi-in-the-sky.com/index.php?id=decoding-with-dl-fldigi
[21:12] <Pcal> 300 baud 8 bits parity 0 2 stop bits
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[21:12] <Pcal> just carrier shift is different
[21:12] <daveake> if you have the camera connected, disconnect it - the image data is binary so will appear as rubbish
[21:13] <daveake> without it you should only get readable text
[21:13] <SA6BSS> parity to none make any change?
[21:13] <Pcal> i haven't diconneted cam but have switched it off in config file
[21:13] <daveake> ok
[21:14] <daveake> yes if you meant "odd" by "parity 0" then change that to None
[21:14] <Pcal> parity is none
[21:15] <daveake> Click the Rv button
[21:17] <Pcal> done that no change
[21:17] <daveake> "no change" ... can't be no change
[21:19] <Pcal> no really - do you want a screen shot?
[21:20] <Pcal> http://imgur.com/28SmbBl
[21:21] <Upu> what does it sound like ?
[21:22] <daveake> right-click the text box and clear it
[21:22] <Pcal> k
[21:22] <Upu> also turn the output volume up until the diamond in dl-fldigi goes green
[21:22] <daveake> +1
[21:22] <Pcal> K
[21:24] <Pcal> goes green but the waterfall fills with red and yellow
[21:24] <daveake> which is good
[21:25] <Pcal> still getting gibberish
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[21:27] <Pcal> same
[21:29] <daveake> and the Rv thing?
[21:30] <Pcal> makes no difference
[21:31] <daveake> Well, it cannot make *no* difference
[21:31] <Pcal> i don't know what to say... only what i see Dave, sorry
[21:31] <daveake> I'm out of ideas
[21:32] <Pcal> me too and i'm a beginner :)
[21:33] <Pcal> thanks anyway... might have a go later. Goning to have a cup of tea.. i need one :)
[21:33] <mikestir> is that definitely the real signal and not a sproggy? it looks pretty ropey in the waterfall
[21:33] <mikestir> did you try tuning up and down a bit to make sure there's not another version of the signal nearby
[21:33] <mikestir> ?
[21:34] <Upu> possibly USB bandwidth
[21:34] <Upu> record the audio lets listen to it
[21:34] <Pcal> no make.. give it a go in a min.. but if i don't get up now, i won't be able to move my old bones!
[21:34] <Upu> see if its choppy
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[21:43] <Pcal> i'm off to bed everyone. Thank you very much for all your help. I'm sure it will get resolved. Be back tomorrow for another try :)
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[22:20] <Geoff-G8DHE> Pcal had AGC turned on in SDR# often better to have it off to start with.
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[00:00] --- Wed Mar 25 2015