For years I have been taking the 12v "transmit out" signal from the back of
Kenwood and Icom radios . I have a voltage divider set up with a 10k and
100k resistor to ground. I tap off of the 100k resistor and drive the gate
of a power MOSFET. The MOSFET pulls to ground the relay line in the amp.
It's cheap, it's quiet, it isolates the amp from the transceiver, and it's
much quicker than the internal relay. Been using it to key my 78 in full QSK
for years without loss of a vacuum relay yet. Tnx to W2VJN for the original
idea.
Tony
N2TK
-----Original Message-----
From: owner-amps@contesting.com [mailto:owner-amps@contesting.com]On Behalf
Of measures
Sent: Wednesday, October 20, 1999 1:29 PM
To: AMPS
Subject: Re: [AMPS] TS940S CONNECTION TO HEATHKIT SB200 LINEAR
>
>Hi Bill. Have a TS-940S and just wired up an amp a
>few days ago.
? The TS-930s has a hv npn transistor that keys the amplifier - without
the delay caused by a relay. The TS-940s uses a relay. The relay will
cause hot switching in any high-speed switching amplifier. The article
about the TS-440s on my Website shows a circuit that replaces the pokey
amplifier control relay in a 440 or 940 with a 300v npn transistor.
Total cost is around 50-cents.
- cheers
- Rich..., 805.386.3734, www.vcnet.com/measures.
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