[Milsurplus] TCS Receiver on High Voltage DC-DC Brick
Roger Basford
Roger at new-gate.co.uk
Wed Mar 6 17:28:34 EST 2019
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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