[ARC5] Missing meter in Phantom Antenna A-61-A (#7777)

[Michael Hanz]

On 4/9/2016 3:37 AM, robinson at tuberadio.com wrote:
> Thank you for the information.
> What type of capacitor is inside?
> It is a vacumn capacitor?

Yes.  It is the same diameter as the one in the BC-442 antenna relay, 
but longer, as one would expect.

> My meter is what Mike said,
> 0-4 (non linear scale) internal thermocouple
> has a white scale labeled AMPERES R.F.
> WESTON 507 (metal case) ARC #7781
>
> Whereas the ANTENNA RELAY UNIT type BC-442-AM or RE-2/ARC-5
> 0-10 (linear scale) external thermocouple
> has a black scale lebeled ANTENNA CURRENT INDICATOR
> GENERAL ELECTRIC (DW-52) metal case, BC-442 and RE-2 (CCT manufactured)
> SANGAMO (Weston 507) metal case, RE-2 (CBY manufactured)

Yup.  The _external_ thermocouple was required in the ATA antenna relay, 
in the _early_ BC-442 (for a time), and finally in the RE-2/ARC-5, for a 
very specific purpose.  If you look closely at the test setup in the 
_first_ diagram at http://aafradio.org/docs/ARC_Test_sets.html , which 
is from a 1941 version of the SCR-274N manual, you will notice a curious 
meter labeled I-71-B, which is a remote RF ammeter that could be 
selected by a switch on the antenna relay.  You might be interested in 
reading "the rest of the story" at http://aafradio.org/flightdeck/I-71A.html

73,
Mike  KC4TOS
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