[MRCA] ATA ARA RX Alignment Question

[Ray Fantini]

Be careful when doing alignments! Eighty year old slugs ten not tb be limber. Also unless someone has messed with the slugs at some point I would not think they need to be cranked on. Poor sensitivity can often be found in locations like high leakage in screen bypass capacitors in the IF or RF stages on old receivers, one or two Ma of leakage can result in little or no voltage on the screen grids and low performance on the IF stage.

Ray F/KA3EKH


From: mrca-bounces at mailman.qth.net <mrca-bounces at mailman.qth.net> On Behalf Of Mark K3MSB
Sent: Sunday, August 17, 2025 9:21 PM
To: ARC5 <arc5 at mailman.qth.net>; List Milsurplus <milsurplus at mailman.qth.net>; Military Radio Collectors Association (mrca at mailman.qth.net) <mrca at mailman.qth.net>
Subject: [MRCA] ATA ARA RX Alignment Question

I'm thinking of aligning my  500 to 1500 Kc receiver.

Page 41 of the manual says to raise the protruding bakelite rods (of the 3 IF transformers) until they snap into the up position.

Delicately playing with one of them, it seems rather fragile, and I have to use a small pliers to move it -- I'm not sure what tool they used back then.

It didn't want to move either way, and I was leery of giving it a good twist for obvious reasons.  The other two seem just as delicate.

The radio plays but it a bit lethargic -- i was thinking of just doing an alignment with the rods as they were (although the manual frown on that)

Comment from anyone that's done an alignment on this RX before?

73 Mark K3MSB

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