TX latency with HERMES LITE

[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

1: "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?"

No, this is not a good idea. Don't parallel PTT SDR outputs all together on the input to the PTT on the amplifier. Might be OK but better to have a switch to route the PTT from the rig outputs to the amplifier so only one PTT is connected at one time.

No, non è una buona idea. Non collegare tutte le uscite PTT dell'SDR in parallelo all'ingresso PTT dell'amplificatore. Potrebbe funzionare, ma è meglio avere un interruttore per instradare il PTT dalle uscite TX dell'SDR all'amplificatore, in modo che solo un PTT dell'SDR (o di altri dispositivi) sia collegato all'ingresso PTT del PA in un dato momento.

2: "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"

I'm not quite sure what you mean by "Clean contact". I think you mean that the CTS pin is showing 5 volts? Yes, it's totally normal that the CTS will have a voltage on it (3.3v or 5v or even higher) but via a very high value resistor on the FTDI adapter, so when it is grounded there will be very little current. Should never be enough to do any damage. Anyway, the CTS is only connected to your PTT switch/foot pedal. What is there to damage? Or are you worried about causing damage to the FTDI adapter? Very unlikely!

Non sono sicuro di cosa intendi con "contatto pulito". Presumo che tu intenda che il pin CTS legge 5 volt? Sì, è perfettamente normale che il CTS abbia una certa tensione (3,3 V o 5 V o anche superiore), ma tramite una resistenza molto alta sull'adattatore FTDI, quindi quando è collegato a massa, la corrente sarà molto bassa. Non dovrebbe mai essere sufficiente a causare danni. In ogni caso, il CTS è collegato solo al tuo interruttore PTT/pedale. Cosa c'è da danneggiare? O temi di danneggiare l'adattatore FTDI? Molto improbabile!

See attached diagram so we avoid misunderstanding!/Per evitare malintesi, vedere lo schema allegato!

Max

[Alessandro55]

ok!! Tancks

[jdow]

You may want the CTS signal to drive a small sensitive relay before you go to the higher power accessories like the cathode circuit of a kW tube amplifier. That should be simple to arrange.

{^_^}