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

[Robert Downs]

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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