I'm still switching the SB220 with the original TS930 NPN transistor since
1982 and I never had problems.
I remember before doing it I checked the transistor data sheet and it come
out it has enough VCE neither dissipates much power since working as a
pure switch.
I don't know if the relay used into the SB 200 has a different voltage coil
than the relay into the SB220.
73,
Mauri I4JMY
-----Messaggio Originale-----
Da: Pete Smith <n4zr@contesting.com>
A: measures <measures@vcnet.com>; AMPS <amps@contesting.com>
Data invio: mercoledì 20 ottobre 1999 20.36
Oggetto: Re: [AMPS] TS940S CONNECTION TO HEATHKIT SB200 LINEAR
>
> 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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