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

[J Mcvey]

Everyone has their own objective on how they want to set these up.  It seems to me that you are making this more difficult than it needs to be, if you just want to have a dummy load test jig. Why not attach a dummy load to the BC-442 antenna relay which already has the thermocouple and ammeter?I made one that fit in a small aluminum box with a variable series cap which I marked optimal positions for 40 and 80 meters. Two leads from the binding posts connect to the BC-442 and the system can be verified in it's native state.
If you are looking to have an original testbed, then I guess the hunt is on for all of the obscure parts and pieces. Good luck!

 

    On Saturday, April 9, 2016 8:00 AM, Michael Hanz <aaf-radio-1 at aafradio.org> wrote:
 

  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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