开云体育

Got it from Thomas George of HFSignals.

On Fri, Jun 9, 2023 at 09:41 PM, W6LKB wrote:

I am a DE user and run both FT8 (via WSJT-X) and JS8Call. Let me know if you want my configuration settings.

It would probably help others if you could post the configuration.
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Gyula HA3HZ

On Sat, Jun 10, 2023 at 08:47 AM, Raj vu2zap wrote:

Folks, is any of you have an open V2, please reply with a pic of where the RTC plugs in?

This test peice came with it rattling inside.

/g/BITX20/message/102612
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Gyula HA3HZ

Folks, is any of you have an open V2, please reply with a pic of where the RTC plugs in?

This test peice came with it rattling inside.

73 Raj vu2zap

Jack,

I could not sleep this evening, so played with the sbitx code.? It turns out that si5351v2.c line 45 needs to be uncommented, and line 46 commented.? Then you get to play with the value of the crystal.

The value provided was way too high for the Si5351 board that I had.? The final value after playing with it is 25002715.? I used WWV to measure the frequency.? The band scope and waterfall make it easy to see the center frequency.? You line up the beak to be on the 10MHz readout.? This was easiest for me to set the frequency span to 0 to 2400 Hertz.? The red line is then centered on the peak of the WWV signal.? I multiplied the error by 3.75 and then added or subtracted to the setting depending on the error being high or low.

I had to reboot, shut down, and restart several times to get the setting to take.? That does not make sense to me as I did build the software after I changed a value.? At times there was no change.? On other reboots, the audio codec would not start properly and caused the sbitx program to abort.? There are still mysteries about this design that I do not understand.

I am going to work on the PWR/SWR meter next.? Once I get that working and calibrated, I will test the rig over time to see if the TCXO is needed for how I use the radio.

73
Evan
AC9TU

Hello,

I will be happy.
I want to use the Qsstv, It may help.

Regards,
Nir

Jack,

does tapping on the relay fix the issue without changing bands?

73
Evan
AC9TU

Jack,

I had a similar issue with the transmitter locking up due to RF feedback. Monitor the current drawn by the radio. For me it would peak, then drop down to a high value. ?My issue was the switching circuit of Q9 and Q10. ?I had to add a resistor and capacitor to stop the feedback. ?

Let us know if there is high current when the condition occurs.?

73
Evan
AC9TU

Part of the mod 2 was a change in the bias circuit replacing the resistors with a resistor and inductor in series. I believe that those were T39-6. ?I am away from my shack right now so can not verify.?

73
Evan
AC9TU

Shirley, which upgrade kit are you referring to? DE upgrade #1 was a power supply fix for the 5V to the Raspberry Pi an upgrade #2 was for a solid state T/R switch. See my photo of the board. I don’t see any toroids of any sort or any color. I was referring to the factory soldered yellow toroids on the main board of the DE that are part of the low pass filter section. Where are your toroids supposed to go?
Jack, N6LN

And here it is! Looks well made.
Jack, N6LN

Evan, check that. It's not a relay.? It happens (losing receive signal after FT8 transmission, and restoring received signals by switching bands and then switching back to the original FT8 transmission band) on FT8 transmission on 15M and then switching to 10M and then back to 15M. Those bands use the same LPF relay! So what else determines whether the receive path is interrupted and restored? Seems to me it must be with the solid start T/R switch of upgrade #2. How might I further track down the problem?
Jack, N6LN

Evan, it seems the lost signal on receive after a FT8 transmission is from a stuck LPF relay for 20 meters. When I switch to another band using another LPF relay and then switch back to 20M (hearing the relays clicking) I get the proper signals on receive on 20M back again. I wonder whether this problem is frequent and whether it was part of the reason to change to MOSFETs for LPF switching in the sBitx V2. Short of replacing the relay, do you think there’s a good way to solve this problem?

Jack, N6LN

What you've described sounds like T30-6.? I have extras and can spare a few.
I can send them if you'd like maybe beat your order to Diz...8^)

You two are my heros! Thanks for sharing all your experiences with this system. I wish I knew enough to contribute to these topics.

I am a DE user and run both FT8 (via WSJT-X) and JS8Call. Let me know if you want my configuration settings.

Ok thank you for helping this Newbie out! ?

Yes. ?It should work with the card removed.?

I found similar units for less on AliExpress and eBay. Not at my desk right now so do not have the links.?

One note: you can use the adjustable resistors to change the voltage level with a 27kOhm resistor across the input to the ATtiny85. ?The bridges I ordered were made to connect to an analog meter and used to adjust the current. Mid range gave me 2.8volts with 40watts from the switch ?

73
Evan
AC9TU