Hi All,

Just finished my 30 meter QCX.? The receiver and all the menu functions work fine, but there is no power out in transmit.? I pulled L1, L2, L3, and L4, recleaned the tips, resoldered them on the board.? I then checked continuity across the pads of each inductor.? The output is -0- and the power on the drains of the power amp transistors is 200 mw.

The DC voltages at pin 3 of IC3 is 0 rx and 2.4 v tx.? The DC voltage at Q1,Q2, Q3 drains is 13.2 v rx and 1.2 v tx.? The DC voltage an the gates of those transistors is -0- rx and 2.4v tx.

Where should I go from here?

Thanks.
Jack, NI8N

Paul

glad you found your trace issue.? now to get this receiver to work very well -- that IQ calibration is vital.? I just emailed another builder on the same topic - perhaps both of you have correctly done the IQ calibration -- if not it makes a huge difference.? without this precise calibration, the image signal (around 1.4 kHz away) may be as large as the signal on your transmit frequency.? with careful adjustment of the nice routine that the designer provided - you can null this down more than 50 dB.? follow the instructions in the manual -- the result is very cool !? glad a few of these nice rigs are landing here in the land of PVRC.?

Curt

Heinz

your statement of IQ balance being broad deserves more attention than given thus far !?

the adjustment of the capacitor is a bit broad, and is less vital to the receiver working well - except in terms of having enough signal.? in contrast, the IQ adjustments are a big deal.?

did you notice that in calibration the scale starts to diminsh - and then suddenly jumps back up ?? this is due to the number of available pixels on the LCD.? when this jump occurs - you should see a number going down by one value each time this happens - the calibration display is re-scaling.? with careful adjustment you can work your way down to the lowest level (I am not remembering if this is labelled 1 or 0 ....).? when you get there, finally just touching the pot will change the display -- this says you have gone far enough.? the result and the procedure are very nice -- make sure you are there !

Curt

Hi Ga?tan

Im currently seting up the GB3SEV/B here in the UK .

It very much early days, however my progess and a 2 min cycle is here -?

Cheers

Tristan M0VXX

Hi all

I'm setting up the new gb3sev beacon , I've started to play with the same sort of things as on4khg.

Please see my first go



Tristan m0vxx




--
Sent from my Android device with Sync for iCloud Mail. Please excuse my brevity.

Hi Hans

thanks for the reply....I only have 1m of cable to the QLG-1 and will be driving 3 devices (so far).

Thanks for these wonderful kits.....gets me interested in radio again after 40 years.

73 don

Dear,


Using the Ultimate3S, I'd like to set up a beacon that will generate alternatively Opera05, PI4, JT65, CW and a steady tone for 30 sec or so.
So, I define the ad hoc data (callsign, msg, and so on) for the selected modes and I?enable all these modes. In run mode, after these modes have been running sequentially, I'd like to send a steady CW tone for 30 sec.
I have seen in section 7 of the FW 3.12 documentation that using FSKCW with FSK set to 0 Hz, a steady tone can be sent.
My question is : how the length of that tone can be defined, if it can be defined ?

Otherwise, in general, what would be the way to send a CW tone for x seconds (x could be parametered) in between sequences of other modes ?

Thanks in advance for your help.
73,

Ga?tan, ON4KHG

I am indeed... one of "those", hi!? ?For the last several months I've been running 7 or 8 wspr slices on the Flex 6700, often 2 per band with two different Wellbrook loops at right angles.? This accounts for the two reports on exactly the same frequency but with different signal levels.? ? In addition I sometimes put a Perseus SDR on a 3rd antenna, often one of the yagis.? This is the 3rd and slighly off frequency report with yet another signal level.

So now you know... the rest of the story.??

73 Don
VE6JY

The GPS module works great on my Ultimate 3S....just got to get an antenna up.

Just ordered a VFO/SIGGEN and a triple GPS-disciplined programmable crystal which will need a GPS signal.

Question is how many devices can the QLG1 drive (whats the fan out number ) ????

73
don

?

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On 22/01/2018 9:30 AM, Victor Nagoryanskii wrote:

... Applying attenuator and reducing RF gain on the IC7300 I can get a signal level as low as S5, but they are still there. So it's not a overloading of receiver.

... but, Victor, it could possibly be the 'computer/soundcard' side of the RX chain rather than your radio receiver.?

Looking at the lower 'Spectrum' graph of WSJT-X in the WSPR-1.png indicates that something is well over driven in the soundcard or software side of the system.? What does the WSJT-X signal 'level' bar graph at the lower left of the WSJT-X screen indicate when the QCX is transmitting?? It may even be in the USB codec sound output of your IC-7300 if it has that feature and it is what you are using.? How many live WSPR signals do you see from other stations are S5 and pushing the WSJT-X 'Spectrum' graph over the top??? Try using a temporary 'clip lead' antenna for testing purposes to get the signal strength from the QCX down so the S-meter is not lifting and the main WSPR signal is not over the top on the WSJT-X 'Spectrum' graph, and see what happens.

73, Bob? ZL1RS

Hi Hans,

Thanks for such detailed response!
Based on what's been said I can conclude that multiple spots does not correlate with spurious signals I see on local receiver.

I'm curious now to find out the nature of those spurs spaced 50 Hz. Powering up QCX with a battery didn't change the picture. Applying attenuator and reducing RF gain on the IC7300 I can get a signal level as low as S5, but they are still there. So it's not a overloading of receiver. I'll post update here if I find it out.?

Kind Regards,
Victor, PA8MM

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In the case of "wspr reports.png" ... there are also a few WSPR stations who have stated that they are running multiple receivers on the same band with different antennas, VE6JY may be one of them.

73, Bob? ZL1RS

Thanks Alan,
I understand now what is going on! I must have missed that part of the manual but that makes sense. I am currently testing the QCX on WSPR with the GPS and am getting a good number of spots.
On CW I will remove the GPS.

Patrick, M0AFZ

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Hi Patrick,

What mode are you in? as this sets how the QCX uses the keying lines / GPS interface.

Does it permanent transmit like key down in? the Alignment menu options that involve the GPS?

cut and pasted from what Han's has already said on the subject:-

?the QLG1 1pps and Serial data are connected to the same microcontroller input pins as the key (dit and dah inputs). There isn't any alternative but for the QCX to interpret information on the key input as keying... it doesn't know if there is a real key connected, or a GPS. If you set parameter "6.1 Beacon" to ON then you enable the beacon. Thereafter the QCX interprets everything on the dit/dah inputs as GPS 1pps and Serial data. Even if you power up, if you have "6.1 Beacon" ON then it will start up in beacon mode.

So basically, on those two inputs (dit and dah), the QCX will interpret input signals as GPS only when it is in Beacon mode or in the Alignment menu options that involve the GPS; otherwise the inputs are interpreted as dit/dah paddle inputs.

One idea is to wire up a 3.5mm stereo plug so that you can easily swap between a paddle and the GPS, when you want to use the QCX as a CW transceiver, and when you want to use it as a WSPR transmitter.