Hi All,
Check in Hints & Kinks, 14th Edition, page 1-18, (also in an issue of QST,
can't remember which issue) for an even simpler hook-up which I have been
using for many years on the TS-850 and now the TS-870. It takes a Radio
Shack reed relay (275-233) with the relay coil in series with a 100 ohm 1/4
watt resistor. Hook the relay coil & series resistor between pins 7 and
common of the remote outlet of the transceiver and let the relay contacts
key the amp. (Pin 7 provides 12v at 10ma). Put it in a 35 mm canister or
something similar and you have a noiseless switch. FWIW.
73, Carl VE9OV
> -----Original Message-----
> From: owner-amps@contesting.com [mailto:owner-amps@contesting.com]On
> Behalf Of Tony Kazmakites
> Sent: Wednesday, October 20, 1999 2:46 PM
> To: 'measures'; 'AMPS'
> Subject: RE: [AMPS] TS940S CONNECTION TO HEATHKIT SB200 LINEAR
>
>
>
> 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.
>
>
> --
> FAQ on WWW: http://www.contesting.com/ampsfaq.html
> Submissions: amps@contesting.com
> Administrative requests: amps-REQUEST@contesting.com
> Problems: owner-amps@contesting.com
> Search: http://www.contesting.com/km9p/search.htm
>
>
> --
> FAQ on WWW: http://www.contesting.com/ampsfaq.html
> Submissions: amps@contesting.com
> Administrative requests: amps-REQUEST@contesting.com
> Problems: owner-amps@contesting.com
> Search: http://www.contesting.com/km9p/search.htm
>
--
FAQ on WWW: http://www.contesting.com/ampsfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|