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Posted Sunday, August 12, 2012 11:47 PM
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Hi All
I just got a Flex SDR 3000 and wonder if I can plug my Kenwood TL 922 Amp directly to the TX out or do I need
An external relay to protect the internal relay on the Flex 3000.

Thanks in advance for your comments, will be highly appreciated .

TBD
Post #5940
Posted Monday, August 13, 2012 6:57 AM
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The one I use is from the heathkitshop.com also protect you radio from shorts from the amp
[url=http://www.theheathkitshop.com/page13/page13.html][/url]

Jim W4WWJ


Jim W4WWJ
Post #5941
Posted Monday, August 13, 2012 10:52 AM
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Thank You Jim, I will get in touch with Mike, WB8VGE
Post #5942
Posted Thursday, August 16, 2012 9:23 PM
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Hi the Flex 3000 does not need a buffer between the amp and the Flex with most amps. The keying is done with a relay in the radio. The Flex 5000 will need a buffer as it uses a soft key system. I called Flex about this, they said Heath Kit amps are hard on the Flex, but other amps are mostly fine.
Post #5948
Posted Friday, August 17, 2012 1:00 PM
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I, personally, always use a buffer whether needed or not....just in case for some unknown reason the amp sends high voltage to the exciter....it'll blow the keying transister and then it'll cost $150+ to get it fixed....it's happened to me more than once.....ouch....
Post #5949
Posted Tuesday, August 21, 2012 9:36 AM
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Hi was wondering if the buffer was needed on the Ameritron 811

New Flex 3000 Owner and I love It:

Post #5953
Posted Tuesday, August 21, 2012 11:37 AM
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Hi Flex Radio says no.
Post #5956
Posted Friday, August 24, 2012 4:39 PM
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Guys :
I've contacted the flex support and this is what they said:

The Flex 3000 should be able to handle that but it is not recommended. The TL922 has about 120 volts DC on that, I personally would not want that much voltage coming inside my TTL logic transceiver. You are suggested that you use an isolation relay for keying of the amp. There are several good ones out there, Ameritron has the ARB704 , I personally use the one from the Heathkit store, AMP keyer

So I ordered one AmpKeyer from Mike (WB8VGE) I'm waiting but should be here in any moment.

TBD
Post #5964
Posted Monday, August 27, 2012 8:30 AM
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The guys from flex says a relay buffer on the Flex 3000 is not needed with the exeption of some Heath Kit amps that produces to much voltege.
Post #5967
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