6400 with Palstar LA-1k amp

Jim

Anyone using the Palstar LA-1k amplifier with their Flex? Supposedly all thats needed is (naturally) the RF Coax and a PTT connection. I have a cable fromTX1 to the Palstar PTT and cannot key the amp. What am I missing?

Alan

Jim

Make sure "TX1" is enabled for the bands you want to key the amp for. Go to Setings>>TX Band Settings.

Alan

KD0RC

Hi Jim, in addition to Alans response, you need to make sure that the RCA jacks are pulled either high or low, depending on your amp (Settings, Radio Setup). Most amps are keyed by bringing the key line low (Active Low), but best to check the documentation for your amp.

73,

Len, KD0RC

David Decoons, wo2x

@KD0RC the Active high/low are only for the TX interlock/Req connections. The TX1,2,3 outputs are always pulled low.

73

Dave wo2x

Jim

Well thanks for the comments, but no luck.

ka9ees

Do you have anything connected to the PTT port?

73,

Ed KA9EES

Jim

I assume you mean the PTT port on the Flex. Yes.......... my Mic. And I have a RCA cable going from TX1 on the Flex to PTT on the LA1K

David Decoons, wo2x

Open a support ticket with Flex but here are some things to recheck.

Make sure TX1 checked in TX Band settings for each band you want the amp to operate.

Do you have an Ohm meter? Using the Ohms position unplug the RCA cable from the amp and check continuity between center and ground when the Flex is in transmit. You can also plug the cable in the amp and unplug the cable from the Flex. Shorting the center pin to the outer should put the amp into transmit.

Double check all of your connections. Ensure you are plugged into TX1 on radio and PTT (not ALC) on amp.

If you check and the radio TX1 line is getting pulled to ground on TX open a support ticket with PalStar.

W8TZ Ross

This is probably a **** question but is the amp in OPR mode?

Jim

Yeah its in OPR mode. Thanks everyone............. I found the issue. I bought a brand new cable for the PTT connection between the 6400 and the LA1K and it turned out to be defective! Moral of the story........ take nothing for granted. All is well now. Thanks everyone for the help

Jim KC3KRZ