It's all about the Software

Alessandro55 wrote: Fri Jan 02, 2026 8:48 am The cable is 1.5m long, I don't use a BT connection or headphones at all!! Yes, the HERMES LITE works fine with the THETIS. When I use the TUNE it works fine, the problem is when I transmit with AUDIO. I wanted to ask something about the elad, but is there a way to make a mechanical PTT so that when I want to talk I have to press the button???

For PTT on Elad Duo see here/Per PTT vedere qui:
https://www.sdr-radio.com/elad-transceiver#Notes

and here/e qui:
https://www.sdr-radio.com/ptt

So, if HL2 works properly with Thetis, this seems to imply that there are no network/LAN issues between HL2 and the PC.

You need to run the audio latency test I mentioned earlier. We want to know if there are any latencies or audio dropouts between the microphone and the point where it can be monitored on the SDRC DSP transmit panel. Run this test WITHOUT HL2 being in TX mode by pressing the RX button on the TX DSP audio monitoring panel, as indicated in my earlier post, and shown in the picture I attached. Then LISTEN and let us know if there are any audio dropouts/delays. If so, please provide the approximate amount of delay/latency.

Quindi, se HL2 funziona correttamente con Thetis, questo sembra implicare che non ci siano problemi di rete/LAN tra HL2 e il PC.

È necessario eseguire il test di latenza audio di cui ho parlato in precedenza. Vogliamo sapere se ci sono latenze o interruzioni audio tra il microfono e il punto in cui può essere monitorato sul pannello di trasmissione del DSP SDRC. Esegui questo test SENZA che HL2 sia in modalità TX premendo il pulsante RX sul pannello di monitoraggio audio del DSP TX, come indicato nel mio post precedente e mostrato nell'immagine allegata. Quindi ASCOLTA e facci sapere se ci sono interruzioni/ritardi audio. In tal caso, fornisci la quantità approssimativa di ritardo/latenza.

Max

OK, I'll try tomorrow and post the results, thanks again, I read how to build a ptt but it's not very clear to me

Questa USB funziona se la collego al PC e al PA per utilizzare con elad e console sdr il PTT meccanico tramite pulsante?? Devo poi attivarlo naturalmente dal console sdr

The chance of that dongle working is very very poor.

I wonder if your audio levels are overloading something. Make sure you are not using VOX. I notice you have it turned on. Turn it off and use the TX button. Once that works you can tune the VOX adjustments for your speaking style and desires. You press it briefly to start transmitting and press it briefly to stop transmitting.

{^_^}

Alessandro55 wrote: Fri Jan 02, 2026 11:26 pm OK, I'll try tomorrow and post the results, thanks again, I read how to build a ptt but it's not very clear to me

Questa USB funziona se la collego al PC e al PA per utilizzare con elad e console sdr il PTT meccanico tramite pulsante?? Devo poi attivarlo naturalmente dal console sdr

FTDI Serial adapter (any) like this/Adattatore seriale FTDI (qualsiasi) come questo:
https://www.ebay.co.uk/itm/365943351983

See very simple circuit like attached picture/Guarda il circuito molto semplice come nell'immagine allegata Taken from here/Preso da qui:
https://youtu.be/F-edK-1KpRc?t=185

Technically better but possibly more complex than needed/Tecnicamente migliore ma forse più complesso del necessario:
https://lance.conryclan.com/home/buildi ... interface/

Max

jdow wrote: Sat Jan 03, 2026 6:56 am The chance of that dongle working is very very poor.

I wonder if your audio levels are overloading something. Make sure you are not using VOX. I notice you have it turned on. Turn it off and use the TX button. Once that works you can tune the VOX adjustments for your speaking style and desires. You press it briefly to start transmitting and press it briefly to stop transmitting.

{^_^}

I'm not using the vox even though I had the level a little raised, I tried and I have no delays with either elad or hemes lite...

Max wrote: Sat Jan 03, 2026 2:40 pm

Alessandro55 wrote: Fri Jan 02, 2026 11:26 pm OK, I'll try tomorrow and post the results, thanks again, I read how to build a ptt but it's not very clear to me

Questa USB funziona se la collego al PC e al PA per utilizzare con elad e console sdr il PTT meccanico tramite pulsante?? Devo poi attivarlo naturalmente dal console sdr

FTDI Serial adapter (any) like this/Adattatore seriale FTDI (qualsiasi) come questo:
https://www.ebay.co.uk/itm/365943351983

See very simple circuit like attached picture/Guarda il circuito molto semplice come nell'immagine allegata
Serial interface.jpg

Taken from here/Preso da qui:
https://youtu.be/F-edK-1KpRc?t=185

Technically better but possibly more complex than needed/Tecnicamente migliore ma forse più complesso del necessario:
https://lance.conryclan.com/home/buildi ... interface/

Max

Usb2rig is not good, I did not understand how to connect the pen, from the PC to the ptt of the pa??

is the connection like this?

Is it connected like this?

Alessandro55 wrote: Sat Jan 03, 2026 6:09 pm
Usb2rig is not good, I did not understand how to connect the pen, from the PC to the ptt of the pa??

OK I am now very confused. I thought what you wanted was to connect PTT switch to SDRC to be able to make SDRC enter transmit mode with an external switch like a footswitch for example when using the Elad FDM-Duo. That is what this circuit was for. In this case use switch to ground the CTS, not DTR!

None of this is needed for the Hermes Lite 2 which has it's own PTT on the rig.

Is this what you want (put SDRC in to TX mode with FDM Duo) or are you trying to do something else?

Ok, ora sono davvero confuso. Pensavo volessi collegare l'interruttore PTT all'SDRC in modo da poterlo mettere in modalità trasmissione con un interruttore esterno, come un interruttore a pedale, come quando si usa l'Elad FDM-Duo. Questo circuito serve proprio a questo. In questo caso, usa l'interruttore per mettere a terra il CTS, non il DTR!

È questo che vuoi (mettere SDRC in modalità TX con FDM Duo) o stai cercando di fare qualcos'altro?

Max

yes, i want to use a mechanical button with elad and CONSOLE SDR, please advise me what to buy, thanks

As for my previous reply, connect switch to GND and CTS (not DTR)

Then connect USB to the PC (not to the Elad)
Job done!

Max

Perfect, so PC and in my case PA (RM Italy 505) doesn't it matter that at the PA PTT input I also have other PTTs from other SDRs? Thanks

I took this one, it cost less and it was in Italy

But this one DOESN'T HAVE A CLEAN CONTACT, it has 5 volts! If I get the pin wrong, I'll burn the battery... are you sure about the contacts? Thanks