There is a solid-state version of the ECA, don’t remember the designation, might be an AM-608A?

Scott W7SVJ

From: [email protected] <[email protected]> On Behalf Of FRANCESCO LEDDA via ARC5
Sent: Monday, July 20, 2026 2:17 PM
To: 'Nico van Dongen' <[email protected]>; 'ARC-5' <[email protected]>
Subject: Re: [ARC5] Schematics of ADF UHF Homer adaptor AN/ARA-25 for ARC-52 radio

Here it is!

It is a fun thing to play with!  Good luck!

From: [email protected] <[email protected]> On Behalf Of Nico van Dongen via ARC5
Sent: Monday, July 20, 2026 3:34 PM
To: ARC-5 <[email protected]>
Subject: [ARC5] Schematics of ADF UHF Homer adaptor AN/ARA-25 for ARC-52 radio

Hello,

I have found all three parts of the UHF Homer adaptor AN/ARA-25 that was used on the early military UHF aircraft radios like the ARC-27, ARC-34 and ARC-52.

The system is now integrated in my ARC-52 installation but so far without proper functionality. 

I have found  a service document labeled: Electronics UHF homer adaptor AN/ARA-25 

that includes a wiring diagram of the ARA-25 in combination with the ARC-34 radio.

It also contains a functional description and block diagram but unfortunately no schematics of the AS-578A/ARA-25 antenna or the AM-608/ARA-25 amplifier.

Anyone here that has schematics available or perhaps knows more of the functionality of the ARA-25?

Nico - PA3ESA