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

Ok I’m new to all this and was going off a video. User didn’t mention removing the SD card so I didn’t. I’ll try that. So the reason I keep on getting that updating process screen is probably because the SD card is still in there?

thanks for the reply!

73
KO
KD0WIY?

Hi Koy,

When you turn on the Nextion, regardless of the Nano connection, you should get the KD8CEC screen. ?If not, there was an error loading the screen from the micfoSD card. ?You must also remove the card after the load into the Nextion. ? What I do is remove power after the screen loads from the microSD card, remove the card, and verify the correct screen coms up after applying power again.

If the above checks OK, verify the wiring.?

One other point, the stock regulator on the Raduino board can only supply a 3.5”. Nextion display. ?If you have a larger than 3.5” display the regulator could be dropping out with the power required to change frequencies.?

73
Evan
AC9TU

开云体育

Very interesting products made by that company!

My board is due to arrive in a couple of days from this manufacturer in Ukraine. Somehow the mail is still getting through.



Jack, N6LN

I should also note that it’s a UBITX v6