[Milsurplus] TCS Receiver on High Voltage DC-DC Brick

[B. Smith]

  12VDC or higher.
Most boards have IC's that quit when the input voltage drops down to 8 
volts.
k4che


On 3/7/2019 7:27 PM, Robert Downs via Milsurplus wrote:
> Are these bricks AC line or 12-14VDC operated?
>
> Robert Downs
>
>
> -----Original Message-----
> From: milsurplus-bounces at mailman.qth.net
> [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Roger Basford
> Sent: Wednesday, March 6, 2019 16:29
> To: David Stinson; boatanchors at mailman.qth.net; milsurplus at mailman.qth.net;
> mrca at mailman.qth.net
> Subject: Re: [Milsurplus] TCS Receiver on High Voltage DC-DC Brick
>
> Interesting idea, Dave. It occurs to me that you could run the exciter
> stages of a TCS transmitter from one of those modules and a higher
> voltage/wattage supply for the PA/modulator section, similar as shown on
> ebay UK as item no 132864229686
>
> The TCS makers plate says 225ma at 400V for the PA supply, that's 90
> watts, so maybe we need a bigger model with some overhead.
>
> 73
>
> Roger/G3VKM
>
> On 06/03/19 19:55, David Stinson wrote:
>> They seem to have improved those little yellow
>> High-Voltage
>> DC-DC converters, sourcing enough power to make
>> them
>> more useful.  You can find'em on Ebay and Amazon
>> for
>> 8 or 10 bucks, like this one:
>>
>> https://www.ebay.com/itm/183717171988
>>
>> They spec them for 20 Watts continuous.  Recently
>> got a couple and decided to try one on a newly-
>> revived TCS receiver.  Set the output for 190V.
>> At that B+ the TCS draws about 70 mills at full
>> volume, about 13 Watts.  Ran it for
>> a couple of hours and the FET never got beyond
>> comfortably warm to a fingertip and the
>> heatsink remained cool.
>>
>> https://photos.app.goo.gl/6j3H8cdxRsGxVJdY6
>>
>> Upsides:
>> Easy-peasy regulated B+ supply.
>> TCS is best with regulated B+
>> Run the whole radio off 12VDC.
>> Cheap.  Tiny thing.
>>
>> Downside:
>> RF noisy, so it must be shielded
>> with filtered leads in/out.
>>
>> GL OM ES 73 DE Dave AB5S
>>
>>
>>
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