[ARC5] ARC-5 TX output circuit modeling [long]

[Mike Morrow]

Ian wrote:

>I would think, however, that most HF aircraft transmitters had to
>operate into antennas that were electrically short (compared to 
>¼ wavelength), and had a radiation resistance significantly less
>than 50 ohms. The capacitive reactance is irrelevant, of
>course, since it plays no part in radiating energy.

The dummy load used to test the SCR-274-N (and AN/ARC-5) HF transmitters should give some indication of expected normal antenna characteristics.  This standard dummy load was the A-61.  It consists of an RF ammeter, 5 ohm resistor, and 100 uuf vacuum capacitor all in series.  The capacitor could be bypassed.

Mike / KK5F