Hermes lite 2 and external PA

[Pentti Pärnänen]

Hi 

I read from https://www.hamradiosecrets.com/sdr-ham-radio-transceiver.html the following claim: 

One word of caution here:

You need to install a relay buffer interface between the HL2 keying relay (EXTR) and the amplifier, to protect the HL2 from the transients that the relays in the amplifier generate when keyed. I use a RBI-1A by HamGadgets.com for that purpose. It comes with the appropriate prewired cables.

Is this true?

In other words, are you using relay between HL2 and PA?

[Heath Petty]

I have two of those PTT interfaces, and they work very well. They also provide some piece of mind and protection for the radio. I have used the EXTR port to directly PTT a few different amps, and they have all worked fine. I have seen some reports about issues with the PTT circuit on the mailing list, so its not a bad idea to use one, especially with an amp like the XPA125B (The QC is always suspect on xiegu radios). I have mainly used my RBI-1A interfaces with my IC-705. So my answer is its not required, but its also a good idea to help protect the radio.

Heath

[Mike Serino]

I have a similar problem with my Hermes and Neptune amp ptt tied to my Ameritron AL 811h. After it keys up something hangs up in the 811h where I get a low signal strength back to Hermes even though the transmit relay releases. When I disconnect the PTT, power off the amp, or switch the amp to standby, the 811h releases the signal to normal. I will be buying a RB1-1A relay buffer to fix this.

Mike KN6MS

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[Pentti Pärnänen]

Hi

Thanks for the answers. I think I'll go with this solution, since RBI-1A i a bit pricey:

Link to relay

I'm going to use my RF2K-S amp with attenuator changed from 10db -> 3db, in order to avoid chaining 2 PA's in series.

Wish me luck :)

Pena OH6PP