30
Jul
'17

From a bunch of stuff some other ham wanted to throw away, this ex-SWR meter.

Stripped

I have no idea why the Dreaded Previous Owner stripped it down to this state. The meter movement is fine, 950-ish mV over a 4k7 resistor gives FSD, so it’s a 200uA unit.

inside

The detector components are still in place, and it looks very similar to the Micronta 21-520A except that there’s only one meter. There’s also a little bobbin on the side for an antenna, presumably to make it into a Field-Strength Meter, but that’s a gimmick and won’t happen.

NewSwitches

The junkbox yielded two switches of the right type and size (one selects Power / SWR, and in SWR mode the other selects Forward / Reverse). There will also be a pot to set FSD in Forward mode after which the Reverse mode should give the SWR. Give or take. Don’t expect a lot from meters like this.

Fast forward a bit and we have

IMG_0070r

IMG_0068r

Don’t ask me what used to live in those two extra holes. This setup works for me, for the price of a few junkbox parts and some time.

 





11
Mar
'15

Trust the military to call a Morse key a “Key and Plug Assembly No. 19”.

It goes with the Wireless Set No. 62, which was vehicle mounted. You strap the key to your leg so that you have one hand free to hold on for dear life while presumably frantically tapping out code with your other hand.

 

 





3
Dec
'14

Well, almost. In Ham Speak, a boat anchor is an old, large, probably obsolete piece of radio equipment. I have more than one.

However:

The Heathkit HW-32 only qualifies if you have a tiny boat. At about 30cm wide and 15cm high, it’s actually quite small for a 14 valve transceiver rated for 200W PEP output. OK, it only does this on a single band, 20m in this case (the HW-12 and HW-22 covers 80m and 40m respectively).

Frequency coverage is 14.2 to 14.35 MHz, for mobile SSB operation. There’s no provision for CW and no coverage of the CW portion of the band.

At 5 1/2 kilos, it’s also too light to be a boat anchor — but that’s because it doesn’t have a built-in power supply. You need to supply 800V DC, 250V DC, and -130V DC bias, as well as 12V for the filaments.

We’ve come a long long way in 50 years.