Re: QCX Troubleshooting - Please can you help?
Can you check and let me know what voltage you are getting at Pins 9 and 10 please? I get no DC voltage at all, and no 20mhz signal either. Julian I've avoided jumping in because I cannot really help. But it seems to me if the display is showing something the 20MHz must be working. I've no idea about voltages but a scope put on the crystal pins will most likely stop oscillation. The way to confirm is with a RX not connected to the device. 73 Alan G4ZFQ
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Re: QCX modification for 40 Meters
The idea is to use two SPDT toggle switches instead of the rotary encoder and emulating the behaviour, the signals is described here: or here
You will get the feel for the pattern you need to make with the switches after some practice (: Make sure to mount them on a small plate to make it easier to switch them as you will need to do this many times.
God kv?ll Daniel,
Tack f?r din hj?lp, men jag vet inte n?gonting i encoder googla
eller p? en kodarens spr?k. Om du har lite information om ?mnet
kan jag f?rs?ka l?ra mig 73 och tack Joel F6cht. ps: jag vet inte
svenska! tack google
Le 02/12/2017 à 15:18, Daniel Ekman
SA2KNG a écrit?:
Om
du vill prova att k?ra den innan du f?tt encodern s? g?r det att
g?ra med str?mbrytare ist?llet, googla encoder s? ser du kanske
hur du beh?ver sk?ta dom f?r att ?stadkomma samma sak som att
rotera encodern.
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Re: QCX Troubleshooting - Please can you help?
Thanks for your efforts.
I've checked the voltage at AVcc, it's exactly 5 volts.
Can you check and let me know what voltage you are getting at Pins 9 and 10 please? I get no DC voltage at all, and no 20mhz signal either.
Best wishes,
Julian
G4ETS
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Re: qcx gps interface issue
The GPS data lines are the same as the CW/Keyer signals.
So be aware the QCX starts transmitting.?
(No open antenna , use a dummy load.)
I found every first transmision in wspr/beacon mode the BS170 became very hot.
High current about over 500 mA but NO HF output. Blowed 3 BS170.
Now on a heathsink no problem.
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Re: DVM/RF detector header Question
HI Barry.
No. You connect a lead onto the RF pin (middle) and then just touch/probe the other end on the antenna connector centre pin.
Make sure you have a 50ohm dummy load connected and then key the QCX to transmit whilst viewing the RF detector menu,
73
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If I plug in the gps it is powered, but something in the qcx is overheated. So I quickly unplug it.? gps is working fine still with 3S.? no shorts to ground on the pins. Getting 3.3k ohms between plus and minus power connection to the GPS. I am not readily seeing much in this circuit, I think I will check the regulator area.?
I did move the inductor as suggested, my strange behavior with the vfo resolution seems to be cured. Everything but gps interface is okay in qcx.
Curt
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Re: ZL1RS balloon flight - BB01
Looks like your flight is near halfway to South America. Glen N8WE
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Re: ZL1RS balloon flight - BB01
---- "Bob Sutton via Groups.Io" <zl1rs@...> wrote:
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DVM/RF detector header Question
So to read the approximate RF Power out on the QCX... I have to jumper the RF Input pin to the +V Output. Is that correct?
Thanks.
Barry. ?VE3ZLB
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Hi Ernie.
Sorry, is this still the FT-8 discussion we were having?
I don't have a beacon
3a.?
Re: FT8 for U3?
From: Ernie Hollingsworth
Date: Sun, 10 Dec 2017 06:05:47 PST
Is your beacon day or night? I'll look for you.
73 Ernie
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Hi OM,
Just bought one, thanks for post. Want to ruggedize a radio for field.
This will be internals.
------------------------
Any RPI connection?
73,
Steve
KL7JT/1
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On Sun, Dec 10, 2017 at 6:20 PM, <N3SZ@...> wrote:
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Re: New Year's Eve Operation
I'm in - I'll be QRSS on 30m. As with some others, it'll be the first time I've used my U3S for anything other than WSPR so thanks for the puch!
73,
John AE5X
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Re: New Year's Eve Operation (how to configure your U3S)
Hi TrueBlue (that’s an unusual name),
Thanks - I enjoy getting all these modes running in the same frame.
It’s entirely dependant on band as to the number of spots. ?At the moment my U3S is transmitting on 10m and has been there since early this year - There are some grabbers operating on 10m and the Knights QRSS group are reasonably active with a lot of discussion this year about meteor scatter where pings have been seen from a few stations. ?
It’s not all about the instant gratification of WSPR :-)
I don’t expect many spots of JT9 on 10m but it’s seen fairly often on CW. ?I tried the TEST call but I seem to remember there was an issue with some feeders to the RBN totally ignoring the transmission when I used that and others reporting it multiple times. ?I was advised to use CQ as well as TEST (hence CQ G6NHU G6NHU TEST) and that works well.
Speaking to Hans at Newark, he did say that he’s managed to get RTTY in the firmware but it still needs debugging. ?I have no idea how close that is on the U3S but I’m in no hurry. ?And yes, RTTY is still used. ?I’ve had over 1,500 Qs this year using RTTY and that’s not just contest Qs.
73 Keith G6NHU
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On 10 Dec 2017, at 20:41, TrueBlue < 44-40@...> wrote:
Great how-to!?
I would question why you are calling CQ in the second message.? If it's to trigger ReverseBeacon, TEST will do it as well and is more appropriate for a non-responding beacon.?
You certainly are an optimist!? I routinely run four modes per frequency in a ten-minute frame and since the advent of FT8 get perhaps three hits a day on JT65 and maybe one hit every week or two on JT9.? I suspect I'd have to wait ten years to get a hit on slow Hellschreiber or FSKCW.? At least WSPR remains relatively active.
I am unaware of the impending RTTY firmware upgrade; is that going to be with the FT8 firmware release?? Is anyone actually using RTTY?
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Congratulations.? You did good.??? 8-)
_._
On Sun, Dec 10, 2017 at 2:30 PM, Barry Mercer <Mercerbarry0@...> wrote: I THINK I've solved the problem.? A poor solder joint!
I went over all the connections with a soldering iron again.? I set up a grid like pattern so I tried not to miss any.? Seems the receiver now is crackle free!!? Pretty awesome!
Thanks everyone.? Sure like the kits!
73. Barry.? VE3Zlb
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I THINK I've solved the problem. ?A poor solder joint!
I went over all the connections with a soldering iron again. ?I set up a grid like pattern so I tried not to miss any. ?Seems the receiver now is crackle free!! ?Pretty awesome!
Thanks everyone. ?Sure like the kits!
73. Barry. ?VE3Zlb
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Barry
Quiet initially and noisy after warm up does sound like a cold solder joint or loose
wire someplace.? It could be the wiper on the volume control as was suggested
by another person.?
A defective transistor could be the culprit but that would be the last choice to test
because it rarely happens with today's devices.? A cracked resistor could make
that sort of noise, as could a defective capacitor but those are also low on the
probability list.? If it is a leaky capacitor it might show as flickering DC voltage
on the side of a capacitor where there should be no DC voltage.?
Since the noise is within the audio range I would still try using a fairly high gain
audio amplifier to sample various points in the signal path.
Arv
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On Sun, Dec 10, 2017 at 1:57 PM, Barry Mercer <Mercerbarry0@...> wrote: Sorry folks, I should have told readers the recording was made with the antenna connected. ??
The crackle is ALSO present when the antenna is disconnected.?
I have not confirmed this but I suspect that when starting the QCX when it's "cold", there is no crackle.? Then, as it "warms" up the crackle develops and stays.? Its frustrating. ? Is this possible??
In any case, thanks for listening... and responding.
Barry. VE3ZLB
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Sounds like the audio has a bad jack, bad speaker/headphone or intermittent short to ground. Take something nonmetallic and tap and jiggle the components in the audio chain. Cold solder joint would have been my first guess.
Sent from my iPhone
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On Dec 10, 2017, at 1:26 PM, Jim Kortge <jim.k8iqy@...> wrote:
On 12/10/2017 3:19 PM, Barry Mercer wrote:
30 Metre QCX, v1.00d powered from 12 Volt battery
I'm having an issue with crackle on my audio. I've posted on this previously. I thought if I attached an audio recording of the crackle, it may help with some diagnosis.
The recording is a few seconds of audio from the thirty metre band.
I have reflowed just about everything on the QCX, twice. No change.
Again, any suggestions are appreciated.
Barry. VE3ZLB
In any case, perhaps after listening Sounds like static to me. Did you have an antenna connected to the rig or is that how it sounds
with a dummy load on the antenna port?
Interesting,
Jim, K8IQY
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On Sun, Dec 10, 2017 at 12:57 pm, Barry Mercer wrote:
I have not confirmed this but I suspect that when starting the QCX when it's "cold", there is no crackle. ?Then, as it "warms" up the crackle develops and stays. ?Its frustrating. ? Is this possible??
The first thing that came to mind was "defective capacitor". Which one? No telling... but some freeze spray might help you find the offending component?
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Daniel Ekman SA2KNG
martin
Nick VK4PP
Keith, G6NHU