At 10:29 AM 10/20/1999 -0700, measures wrote:
>
>>
>>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.
This is part of the story. Actually, the TS-930 can switch that line with
either a transistor or a relay, depending on a jumper setting inside the
radio. However, the transistor switch in the 930 is not rated to handle
handle the SB-200 relay voltage or current - I think it's 60V/50 ma. or
some such thing. I'm guessing the 940 is similar. I was also warned
against trying to switch my SB-220 with the relay, without a series
current-limiting resistor.
For an SB-200, I suspect you get hot switching regardless of how fast or
slow the transceiver is...
73, Pete N4ZR
Sometimes a tower is just a tower
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