On 12/16/2013 8:26 AM, Mark Petiford wrote:

I
bought a used pair of small transistor circuit boards that converted
the audio characters (diddle) to current loop characters (90ma
current loop???) for RX and TX.

60mA loops. Later, 20mA polar loops became popular, but I don't remember why. Wonder what it would be like to work a RTTY contest with a "real teletype?" Perhaps similar to:

Having inherited an SX-28, I decided to work an NAQP CW retro. I found my last 40m ARC-5 and Heath power supply in the basement and fired up with a J-38. I lasted 2 hours before I overdosing on nostalgia. Unlike wine, 36 years in the basement did not mellow the ARC-5's key clicks. I only got shocked from the key a couple of times.

The only reason the "good old days" are remembered as "good" is because we had no idea what was coming. :-))

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2014 Cal QSO Party 4-5 Oct 2014
- www.cqp.org

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