highaltitude.log.20150924

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[02:01] <SpacenearUS> New vehicle on the map: 03MTG004 - 12http://tracker.habhub.org/#!qm=All&q=MTG004
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[04:30] <Jartza> Æ
[04:30] <Jartza> ?
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[05:14] <SpacenearUS> New vehicle on the map: 0313_chase - 12http://tracker.habhub.org/#!qm=All&q=13_chase
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[05:53] <SpacenearUS> New vehicle on the map: 03Seed2 - 12http://tracker.habhub.org/#!qm=All&q=Seed2
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[08:32] <SpacenearUS> New vehicle on the map: 03DL0MES - 12http://tracker.habhub.org/#!qm=All&q=DL0MES
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[10:22] <ntx2> Hi there - I am looking for help with my transmission. Previously, I was getting good reception from my transmission but in the past 2-3 days, I am hearing a lot of hiss in the background. Any idea what might be the source of the hiss and how I can eliminate it?
[10:22] <ntx2> I wonder if this will affect the quality of transmission of the real flight
[10:24] <fsphil> have you changed anything?
[10:25] <ntx2> I only resoldered the tempareture sensor which is sitting on the same stripboard as the NTX2
[10:25] <ntx2> so I had to remove the stripboard from its place on the payload to do the soldering
[10:26] <ntx2> but I did not touch the solder for the NTX2
[10:26] <gonzo_> possibly it's som,ething changed on tour rx set up
[10:27] <ntx2> receiver setup?
[10:27] <ntx2> or transmitter..?
[10:27] <fsphil> you might have tuned into an alias (I think that's the correct term?)
[10:27] <ntx2> tuned into alias? how do I check that?
[10:27] <fsphil> if a signal is very strong it can appear multiple times on your receiver at different frequencies
[10:27] <fsphil> check for a stronger signal
[10:27] <ntx2> I have not changed the receiver frequency
[10:28] <ntx2> but on the dl-fl-digi side, I do see that the red bars are not bright red as they used to be
[10:28] <ntx2> now they are grainy red bars
[10:28] <ntx2> which might be the hiss/noise?
[10:28] <fsphil> can you take a screenshot?
[10:28] <fsphil> sometimes easier to see
[10:29] <ntx2> sure
[10:31] <ntx2> http://imgur.com/WBlRgpL
[10:37] <fsphil> that doesn't look too bad
[10:37] <fsphil> can you show gqrx?
[10:40] <ntx2> http://imgur.com/kL7wdbH
[10:43] <ntx2> http://imgur.com/I0EANUd - this one is where I have connected the USB antenna to the TV tuner. Since my payload TX antenna is connected, I had removed the RX antenna
[10:43] <fsphil> try zooming in a bit. it might be a bit off
[10:43] <ntx2> how do I zoom in?
[10:43] <ntx2> I do it with the mouse by moving the ray around and it is never precise
[10:44] <fsphil> you see the line of frequencies above the blue waterfall?
[10:44] <ntx2> yeah
[10:44] <fsphil> if you hover the mouse over that it should change to a hand
[10:44] <fsphil> use the mouse wheel to zoom
[10:44] <fsphil> you can use the left button to click and drag to move it zoomed window around
[10:46] <ntx2> when I click (when the hand is shown) it just drags the screen around
[10:46] <fsphil> yeah
[10:46] <ntx2> but does not give me a zoom in
[10:46] <fsphil> the mouse wheel will zoom
[10:46] <fsphil> if you have one
[10:46] <ntx2> I do not
[10:46] <fsphil> ah, me neither :)
[10:46] <ntx2> so how to zoom? :)
[10:46] <fsphil> newer versions of gqrx have a zoom control under "FFT Settings" down on the bottom right
[10:47] Nick change: fl_0 -> fl_0|afk
[10:50] <ntx2> but I still cannot zoom! ...
[10:51] <ntx2> I saw one launch video where they were zooming in and out of the signal which is what I want to do
[10:51] <ntx2> but here is the main question
[10:51] <ntx2> how do I ensure that my transmission setup is good enough to be able to receive the signal for far distances..?
[10:52] <fsphil> best way is to just try it at a distance
[10:52] <ntx2> I did a test where I placed the payload in the balcony of a 5th floor apartment and I was able to receive from another balcony 300 m away. But the signal was very weak
[10:52] <fsphil> if you have a large hill or mountain nearby that can be a great way to test
[10:52] <fsphil> they'll have been using the mouse wheel. have you nothing in FFT Settings?
[10:53] <ntx2> I am testing with an antenna which is the regular DVB-T USB antenna without any noise filter
[10:53] <ntx2> not a special antenna
[10:53] <fsphil> yeah you won't be able to use that for longer distances
[10:53] <fsphil> something like http://cpc.farnell.com/1/1/21033-watson-wsm-270-mini-mag-antenna.html will work much better
[10:53] <ntx2> I will be using a different antenna from my friend for the real launch day
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[10:57] <ntx2> so basically my thought is this - if I can receive the tx from a max distance of 300m with a regular antenna, can I safely assume that the reception will be good for a regular antenna?
[10:57] <ntx2> or I should just test it with the real antenna?
[10:57] <fsphil> never assume
[10:57] <fsphil> it'll *probably* be fine, but you don't want to find out it's not after you've let go
[10:57] <fsphil> it happened me once :)
[10:58] <ntx2> I know..that is what I am thinking now
[10:59] <jokke_> ntx2: if you have possibility to borrow that antenna from the friend for testing, do so
[10:59] <ntx2> makes sense
[11:00] <fsphil> at about 10km it should still be a good signal
[11:00] <fsphil> they don't get noticably weaker until a few 100km
[11:01] <fsphil> well, depends on the data rate
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[11:01] <fsphil> and antennas. and radio. ok depends on a lot
[11:02] <infaddict> ntx2: i had good RX up to 500+m but longer than that it didnt work. Luckily picked this up during long range testing and changed radio/antenna.
[11:02] <infaddict> so i'd echo fsphil in saying dont assume and if at all possible, test it
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[11:07] <ntx2> infaddict: how did you do long range testing?
[11:07] <ntx2> and what type of problems was there in your radio/antenna and what did you change?
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[11:07] <eroomde> it's hard to actually test at 100km without actually teting it
[11:07] <eroomde> though you could insert attenuators
[11:08] <infaddict> i found a big area of flat grass land locally. i built a basic wood pyramid structure and hung payload from it and placed at one end of big field. Then I drove off in car to see what happened.
[11:08] <eroomde> however if you do the sums for the link budget, you can be fairly confident
[11:08] <ntx2> eroomde: what do you mean by "insert attenuators"?
[11:08] <infaddict> that proved the 500m+ problem. i upgraded my radio to a AirSpy which fixed the issue for me. I then did further long range testing (5 miles+) with 2 cars (1 payload, 1 chaser)
[11:09] <eroomde> ntx2: so, say to test at 500m range
[11:09] <eroomde> the distance between two hilltops perhaps
[11:09] <eroomde> you want to see what it's actually like at 100km
[11:09] <eroomde> 100km is 200 times greater than 50km
[11:09] <eroomde> so the signal at 100km is 200squared weaker than at 500m
[11:09] <eroomde> which is 40,000
[11:10] <eroomde> so you can fake that by adding in attenuatorsbetween antenna and receiver that reduce the signal strength by 40,000
[11:10] <ntx2> so you are trying to model it
[11:10] <ntx2> but that may or may not be a good test, right?
[11:11] <ntx2> but I like it since we can see how it will behave at 100 km
[11:11] <ntx2> which we cannot test unless we do a real flight
[11:11] <eroomde> which is about 45db if i've done the mental maths right
[11:12] <eroomde> so you'd hadd 45dB of attenitation in the chain and see if you can still receive. it should be a decent test
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[11:12] <eroomde> nothing can perfectly test it like an actual light but i you're worried, that's what I'd do
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[11:13] <ntx2> how can I add 45db of attenuation?
[11:13] <ntx2> is it in the gqrx setting?
[11:13] <eroomde> no!
[11:13] <eroomde> it's a physical thing
[11:13] <eroomde> you buy attenuators
[11:13] <eroomde> they're little modules with an rf connector in each end
[11:13] <eroomde> like resistors, if you like
[11:13] <ntx2> sure
[11:13] <ntx2> I am guessing this can be done via software also?
[11:13] <eroomde> i must stress that most people don't bother with this
[11:14] <ntx2> which is a good thing or bad?
[11:14] <Geoff-G8DHE-Lap> But you also have to make sure that the RF doesn't bypass the attenuator and creep into the Rx via another path locally!
[11:14] <eroomde> they know the tx power, they know the ground-plane with monople tx antenna gain, they know the antenna gain, they know the receiver senstivitiy, they know the bandwidth and baud rate
[11:14] <eroomde> and from that you can calculate that it should be just fine in hab
[11:15] <eroomde> if you do a typical ukhas-sytle flight with normal radios and antennas and so on, you don't really have to re-confirm all this for yourself as it's worked so well for others
[11:15] <ntx2> looking through the wiki, I found this http://homepage.ntlworld.com/lapthorn/coathanger.htm
[11:15] <ntx2> is the coat hanger antenna really as good as a 70 mm one?
[11:15] <eroomde> don't bother with a moxon for receiving
[11:16] <eroomde> not on your first flight
[11:16] <eroomde> just use a normal vertical or a colinear or something
[11:16] <ntx2> meaning, get myself the 70mm one? like this - http://cpc.farnell.com/1/1/21033-watson-wsm-270-mini-mag-antenna.html
[11:16] <eroomde> yeah
[11:16] <eroomde> mount it on something metalic like a car roof
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[11:17] <infaddict> ntx2: thats what I have and worked great on chaser car roof
[11:17] <ntx2> ok
[11:17] <ntx2> let me get it now
[11:22] <fsphil> good magnets on them too
[11:22] <fsphil> it's quite happy at motorway speeds
[11:25] <ntx2> but I might need a airspy for it to work well?
[11:27] <fsphil> not at all
[11:27] <infaddict> no
[11:27] <fsphil> airspy is good though
[11:28] <fsphil> rtlsdr is fine (better with the habamp)
[11:28] <SpacenearUS> New vehicle on the map: 03KZN-Dachstation_chase - 12http://tracker.habhub.org/#!qm=All&q=KZN-Dachstation_chase
[11:28] <infaddict> my particular problem was my cheap dongle that didnt seem to work at long range (even with habamp). i tried 2 dongles and both were the same. tried both mini mag and yagi. so in end upgraded to airspy...
[11:28] <infaddict> but others have had better results with dongles
[11:29] <craag> I've had no problem chasing with a barefoot rtlsdr
[11:29] <craag> but would suggest upgrading (at least to habamp) if you have the budget
[11:29] <infaddict> as i want to track other peoples balloons, upgrading was gonna happen anyway so for me was a no brainer
[11:30] <infaddict> yep craag, not sure if i had a dodgy batch of the rtlsdr dongles or something. as i said others have used them fine.
[11:31] <ntx2> whats a rtlsdr? Sorry about asking a basic question
[11:31] <gonzo_> are there any settings that you may haf wrong/different fro others?
[11:31] <craag> ntx2: dvb dongle thingy
[11:31] <ntx2> ok...thats what I have
[11:31] <fsphil> I used one to receive DVB TV once. novel eh
[11:31] <craag> I did do half my first chase with the gain turned right down :P
[11:31] <craag> only noticed on descent..
[11:32] <craag> grr sdr# defaults
[11:32] <craag> (updated it the night before lol)
[11:32] <fsphil> there are too many gain controls on modern sdrs
[11:32] <fsphil> I never know what to set them at
[11:33] <gonzo_> lookinmg forwarfd to trying the airspy, when the uk supplier gets some more in
[11:33] <gonzo_> though for most of my receiving, I have an sdr just for the bandscope and the actuall receiover is analogue
[11:35] <ntx2> so whats a better setup for a first timer and to be on budget? a simple rtlsdr? rtlsdr+habamp? 70mm antenna alone? 70mm antenna + habamp?
[11:36] <ntx2> right now I am only using a rtlsdr and it is clearly not enough
[11:36] <gonzo_> my personall recomendation is to use a habamp
[11:36] <craag> err 70cm magmount definitely
[11:36] <Geoff-G8DHE-Lap> Yes get a HabAmp
[11:36] <SpacenearUS> New vehicle on the map: 03KZN_chase - 12http://tracker.habhub.org/#!qm=All&q=KZN_chase
[11:37] <ntx2> habamp with a rtlsdr?
[11:37] <craag> that + habamp + rtlsdr is the common budget setup
[11:37] <gonzo_> yep
[11:37] <gonzo_> the FCD p+ is probably the only dongle rx that is sensitive enough (and has internal filters
[11:37] <Geoff-G8DHE-Lap> Minimise cables between units as well, as its very easy to pull a cable when busy!
[11:37] <craag> can be a pain with lots of dongles and cables, but gets you v decent performance for cheap
[11:38] <Geoff-G8DHE-Lap> Box the Dongle and Habamp something like this http://360.g8dhe.net/hab_flights/HABAMP_and_DONGLE/
[11:38] <Geoff-G8DHE-Lap> then no extra co-ax/power cables hanging around to get tugged
[11:38] <ntx2> but if the antenna of my rtlsdr cannot catch the signal at 500m, how can it work with a habamp?
[11:39] <gonzo_> it may be worth boxong the rtl and habamp, with a udb extenmd lead, just to keep it all together and safe, especially if using mobile/postable during a chjase
[11:39] <gonzo_> 500mtrs along the ground? or up in the air
[11:39] <Geoff-G8DHE-Lap> The one your using is NOT tuned to the right frequency!
[11:39] <Geoff-G8DHE-Lap> that's why you want the correct aerial for the band your using
[11:40] <ntx2> 500m in the air (tx in one balcony and rx in another balcony 300m away)
[11:40] <ntx2> Geoff - how do I know if I have tuned to the right freq or not?
[11:40] <Geoff-G8DHE-Lap> By measuring the length or buying it made for the band
[11:41] <ntx2> how do I measure the length?
[11:41] <Geoff-G8DHE-Lap> the active part of the Tracker aerial is measured for 164mm I believe which is 1/4 wave length of 434MHz
[11:41] <Geoff-G8DHE-Lap> with a ruler
[11:42] <Geoff-G8DHE-Lap> Aerials will be either 1/4 or 1/2 wave, 1/4 wave when mounted above a reflecting surface or ground plane as it acts as a mirror
[11:43] <Geoff-G8DHE-Lap> 1/2 wave when on its own like a dipole or a Yagi aerial
[11:43] <ntx2> so the aerial of my receiver is about 15cm...
[11:43] <ntx2> so it is clearly wrong
[11:43] <Geoff-G8DHE-Lap> and its not mounted above a ground plane either
[11:44] <ntx2> yeah
[11:44] <ntx2> so why should a 70mm antenna work then?
[11:45] <Geoff-G8DHE-Lap> where does 70mm come from ?
[11:45] <infaddict> antenna lengths are a percentage/fraction of the wavelength of the frequency you want to receive.
[11:46] <infaddict> 1/4 and 1/2 wave means 1/4 or 1/2 of the frequency the antenna was designed for.
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[11:46] <infaddict> 434Mhz is 70cm wavelength. So a 1/4 antenna is around 164mm long.
[11:46] <infaddict> thats my laymans way of looking at it anyway ;-)
[11:47] <infaddict> Just ensure you buy the right band/length antenna like the one you linked earlier
[11:47] <Geoff-G8DHE-Lap> Thats good enougth! There are end effects and diameter to take into account but only small differences
[11:48] <Andrew_M0NRD> Anyone got any experience on permissions with restrictions on drift? Just got permission document for Hamfest launch and not allowed to drift NE or E due to military airfields
[11:49] <gonzo_> we commonly get those down here because of the souhampton/bornemouth airspaces
[11:49] <infaddict> yep i got one for Oxford airport too.
[11:49] <infaddict> so you are at mercy of winds on day of launch
[11:49] <gonzo_> you just have to apply for a couple of weekends and see if the predictions are good for the day
[11:49] <SpacenearUS> New position from 03MTG004 after 0310 hours silence - 12http://tracker.habhub.org/#!qm=All&q=MTG004
[11:50] <Andrew_M0NRD> got two days for Hamfest, they wanted launch tomorrow.. definitely a no go from prediction http://predict.habhub.org/#!/uuid=72d4b8559fb93e1fb2184ecb870d2cfcc2412ba7
[11:51] <gonzo_> is that newark?
[11:51] <Andrew_M0NRD> Yes
[11:51] <Andrew_M0NRD> Saturday looks okay http://predict.habhub.org/#!/uuid=906254c811bfed69c390f031c08c0fb6c1221243
[11:51] <craag> Andrew_M0NRD: Note that you should check the relevant airspace, but they often only care about the drift just after launch
[11:51] <craag> ie. while it's still low
[11:51] <craag> sat looks good :)
[11:52] <gonzo_> as a backup plan, possibly go for a pico launch?
[11:52] <Andrew_M0NRD> how low is low?
[11:52] <Geoff-G8DHE-Lap> Mainly aircraft heights <10Km ?
[11:52] <craag> yeah
[11:53] <craag> I think southampton airspace tops out at 7km or so
[11:53] <craag> for example
[11:53] <craag> so we've flown where it's gone west (away), and then changed direction at 12km and gone over the airspace
[11:53] <Andrew_M0NRD> Did think it would be issue.. getting anything out CAA is like getting water out of a stone
[11:54] <ntx2> thanks for all that info. Have ordered a 70cm antenna. I will test with it and see how it goes
[11:54] <craag> I'd say saturday looks a far better flight anyway
[11:54] <craag> drier :P
[11:54] <SpacenearUS> New position from 03EOS_T2 after 0315 hours silence - 12http://tracker.habhub.org/#!qm=All&q=EOS_T2
[11:54] <gonzo_> my only notam'ed flight, the weather changed on the last day of the permit and took us north, away from the airspace. Then the upper winds too us back into it, but well above the flight paths by the time it as there
[11:54] <fsphil> ntx2: you might need an adaptor if you ordered that magmount
[11:54] <Andrew_M0NRD> That is what I'm thinking.. not as far to drive
[11:54] <ntx2> what sort of adaptor?
[11:54] <fsphil> ntx2: what kind of plug do you have on the dongle? and what magmount did you order
[11:54] <craag> Also ground winds might be easier on you
[11:55] <gonzo_> Andrew_M0NRD, I found that asking them for advice was a waste of time. They prefer to just have an application
[11:55] <infaddict> the magmount is BNC
[11:55] <gonzo_> I assume it is because of all the different parties they have to contacT?
[11:56] <infaddict> gonzo_: i had an entirely different experience (albeit one and only time i've applied). I rang them and they even chatted thru different options and suggested a site for me!
[11:56] <fsphil> woha
[11:56] <gonzo_> I need to sit down
[11:56] <fsphil> never had that happen
[11:56] <infaddict> lol
[11:56] <Andrew_M0NRD> Only second attempt at flight, so don't want to upset the apple cart, think it best I don't attempt tomorrow
[11:57] <gonzo_> DM was chatty on email, but mainly when asking if they could slip the dates as he had not managed to process the forms
[11:57] <infaddict> i did give them a sob story about how i sent my original application to wrong e-mail address and how i'd invested 6 months of time/money, plus driving 300 miles to launch. very helpful in the end.
[11:57] <gonzo_> what payload are you flying?
[11:57] <ntx2> the magmount is terminated with a BNC
[11:57] <ntx2> so that is not the same with a rtlsdr that I currently have
[11:57] <ntx2> ?
[11:57] <fsphil> did you order that watson one from CPC?
[11:58] <fsphil> rtlsdr's all come with different sockets
[11:58] <ntx2> interesting
[11:58] <Andrew_M0NRD> DM was quite good for the Eggsplorer launch, originally had to be early morning but managed to push it back till 11am which was better for the event
[11:58] <gonzo_> I did a pico launch from our hamfest last month. For a bit of fun
[11:59] <ntx2> ordered it from ebay since cpc does not ship to France
[11:59] <fsphil> ah
[11:59] <fsphil> if it's the same one, it's BNC but comes with a BNC > SMA adaptor
[11:59] <ntx2> supplier in UK though
[11:59] <fsphil> odds are your dongle doesn't use either
[11:59] <Andrew_M0NRD> gonzo_ I have been too ambitious with this one I think.. SSDV etc and flying pigs
[12:00] <ntx2> this is the description : This compact and convenient magnetic mount is ideal for use with dual band 2m & 70cm transceivers. A very powerful micro magnet is incorporated in the base, which provides remarkable adhesion. Fitted with 2.75m coaxial cable terminated with a BNC plug.
[12:00] <fsphil> aah maybe just BNC then
[12:00] <fsphil> you'll need to find out what type of socket your dongle has
[12:00] <fsphil> might be worth taking a photo, someone here should know
[12:00] <craag> !wiki rf+connectors
[12:00] <SpacenearUS> 03craag: Wiki page 03rf_connectors (guides) - 12http://ukhas.org.uk/guides:rf_connectors
[12:00] <infaddict> yep i bought a converter cable to a MCX dongle connection
[12:01] <infaddict> my dongle had MCX which is very small circular push fit
[12:01] <fsphil> the ones I have are the horrible UHF TV sockets
[12:01] <fsphil> but I got a nice adaptor to BNC
[12:02] <infaddict> ntx2: you can never have enough adaptors/converters and they are cheap
[12:02] <ntx2> sure
[12:03] <ntx2> http://i.imgur.com/uQ4rSK8.jpg
[12:03] <ntx2> this is my rtlsdr connectors
[12:03] <fsphil> yeah thats the UHF type
[12:04] <ntx2> so I need a BNC to UHF connector?
[12:04] <fsphil> https://en.wikipedia.org/wiki/Belling-Lee_connector
[12:04] <Geoff-G8DHE-Lap> or Belling Lee, TV aerial connector
[12:05] <Geoff-G8DHE-Lap> UHF is sometimes used to describe PL259 as well
[12:05] <infaddict> search ebay for "uhf to bnc" and look for the correct male/female orientation. lots of them on there.
[12:07] <Geoff-G8DHE-Lap> I've always replace Belling Lee with BNC directly see the link earlier
[12:07] <fsphil> http://www.ebay.co.uk/itm/BNC-SOCKET-to-TV-COAX-PLUG-ADAPTOR-/261287660467
[12:07] <fsphil> something like that is prefect
[12:08] <Geoff-G8DHE-Lap> Be wary of some chinease types the internals are NOT designed for RF !! See here http://360.g8dhe.net/hab_flights/connectors/
[12:09] <craag> lol that's awful
[12:09] <Geoff-G8DHE-Lap> :(
[12:09] <fsphil> ah man
[12:10] <Geoff-G8DHE-Lap> For a novice to get one of those is a nightmare!!!
[12:10] <infaddict> then you get the world of RP!
[12:11] <infaddict> so easy for a novice to buy RP stuff
[12:13] <ntx2> nice :)
[12:13] <ntx2> bought the one you linked to on ebay
[12:17] <infaddict> so that will allow you to use your new 1/4 wave magmount into your dongle and you can test performance. as mentioned above, i recommend a HabAmp if you can afford one. It is an amp/filter specifically designed for HAB frequencies.
[12:17] <infaddict> but you can see how your setup performs without one first of course
[12:23] <SpacenearUS> New vehicle on the map: 03BENNY_1 - 12http://tracker.habhub.org/#!qm=All&q=BENNY_1
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[12:45] <mfa298> you should be able to get the bnc - tv adapters much cheaper than that although probably only if you buy packs of them
[12:46] <mfa298> Geoff-G8DHE-Lap: of course some might suggest even a good pl259 isn't designed for RF :p
[12:47] <eroomde> it's more a locator for a screw
[12:50] <fsphil> hah
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[12:50] <fsphil> the belling lee might actually be worse than PL259
[12:54] <Geoff-G8DHE-Lap> mfa298, yup not sure where the name came from, its fine for HF work!
[12:55] <gonzo_> pl259's are quite nasty, though often made worse (if that is poss) by poor assembly
[12:55] <gonzo_> it was originally designed as a video connector for US ww2 radar
[12:55] <gonzo_> I much prefer N types
[12:56] <gonzo_> I do use BNCs on my patch panels though
[12:56] <gonzo_> not sure I'd trust belling lee for any TX
[12:56] <Geoff-G8DHE-Lap> Yup with care you can actually make an "N" type into a rotary connector, small screw in the shell to lock the thread, whilst allowing the internals to turn!
[12:57] <gonzo_> though lots of 60's desighs for AR kit used them
[12:58] <Geoff-G8DHE-Lap> the bulkhead mount also matches in size so easy to change a SO239 into an N
[12:58] <gonzo_> not sure I'd like tto do that, as it would quickly wear out the plating on the pins. And I'd be worried about the braid connection/security
[12:58] <Geoff-G8DHE-Lap> fine for a weekend Contest!
[12:58] <gonzo_> except on bloody AR rigs, where they like using those oval mount 239's. But you can file an N chassis mount to match
[12:59] <Geoff-G8DHE-Lap> :)
[12:59] <gonzo_> I've replaced them on all my AR commercial rigs, where you can get at the insides wityhout surgery
[13:00] <gonzo_> in thgose cases I've put an adaptor on and a grub screw
[13:01] <gonzo_> (nice, just found that there is a slackware distro for the Pi2)
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[13:39] <mfa298> I've got to the point most of my TV / Commercial radio coax is terminated with BNCs and then a suitable adapter on the ends (belling lee, F etc)
[13:40] <mfa298> has the benefit I can also stick rca connectors on the end for composite / audio stuff
[13:52] <gonzo_> for rx stuff, I use lots of ct100 sat tv coax. With the hateful F types, but permamently fitted with BNC adaptors
[14:01] <SpacenearUS> New vehicle on the map: 03yl3gbc_chase - 12http://tracker.habhub.org/#!qm=All&q=yl3gbc_chase
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[14:24] <zyp> mfa298, how do you deal with the 50/75 impedance mismatch?
[14:25] <eroomde> http://media.giphy.com/media/GODSCQebffJzW/giphy.gif
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[14:26] <mfa298> zyp: in theory all the stuff for rx is 75R and is using 75R parts (urm70 etc), although I don't necessarilty trust that the 75R BNCs are really 75R (mostly as I bought cheap ones)
[14:27] <mfa298> and probably less of an impedace mis-match and overall much lower losses than the "High Quality TV coax" most people use.
[14:28] <mfa298> some of that stuff has air content >> metal content
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[14:42] <gonzo_> I never worry about the mismatch. As I doubt very much that many rx components are going to be that close to 50r anyway
[14:43] <gonzo_> and it's all post lna for me anyway
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[16:34] <SpacenearUS> New vehicle on the map: 03MASAM-mm_chase - 12http://tracker.habhub.org/#!qm=All&q=MASAM-mm_chase
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[18:43] <michal_f> I bought a yagi antenna from eBay and it was advertised as tuned to 435 MHz. Checking it with rtl-sdr-panorama shows this: https://drive.google.com/file/d/0B_8ipK0TpiuhSTItbHF1NjdQQWc/view?usp=sharing
[18:43] <michal_f> is this acceptable to you ?
[18:43] <michal_f> it's peak is for ~428 MHz
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[18:48] <michal_f> I'm going to use it for ~434.650
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[19:29] <SpacenearUS> New position from 03BENNY_1 after 037 hours silence - 12http://tracker.habhub.org/#!qm=All&q=BENNY_1
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[19:46] <Maxell> michal_f: for RX all near 400 MHz will be fine
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[19:56] <michal_f> thx Maxell
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[00:00] --- Fri Sep 25 2015