[ARC5] AN/ARR-69 inquiry

[Francesco Ledda]

See answers below!

Best, Francesco K5URG
> 
> 
> Sent from my iPad
> 
>> On Mar 24, 2024, at 06:20, zakariya.abu at yandex.com wrote:
>> 
>> I'd like to inquire about the AN/ARR-69 emergency UHF receiver (20 presets + 243 MHz guard) mostly used on naval jets as a go-between the AN/ARA-25 or AN/ARA-50 UHF DF "adapters" and an indicator (eg. the ID-250 RMI) that provided course to a UHF transmitter, whose signal was being picked up. I have a Collins brochure on the AN/ARR-40, but nothing on the AN/ARR-69. Hence, my questions are:
> USAF used ARR-69 as well
>> 
>> (1) Was the AN/ARR-69 an updated (perhaps solid-state) version of the Collins AN/ARR-40 since both used the same C-1457/ARR-40 console control unit? If yes, in what dimension? Did both use crystal-controlled presets with the CR-23/U crystals? Were sensitivity and selectivity improved in the AN/ARR-69 compared to the AN/ARR-40?
> 
> Yes! Yes! 1/3 the size. In F-4, ARR-69 was controlled by ASQ-19 control head. Need to check manual for crystal related Q. Download MIL-R-23767B(AS) for detailed specs.
>> 
>> (2) Was the AN/ARR-69 indeed frequently used when TACAN or other navaids were available? Was it used in the air-to-ground mode only, or the air-to-air, as well, to home on other aircraft flying at altitude?
> No! No relationship with TACAN. A to A and A to G.
>> 
>> (3) Could the AN/ARR-69 both in theory and practice pick up a signal from a low-power ELT, eg. an AN/PRC-90 or AN/URT-33, and effectively home on it via the AN/ARA-50 UHF DF?
>> 
> Yes! In F-4, DF ARA-48 was only for main Comm.
> 
>> (4) Considering the existence of the UHF DF equipment on military jets, did the military use a kind range beacons on UHF, which principle of operation resembled the old LF A-N range beacon system or the YE-ZB system, or the MF ADF?
> 
> No!
> 
> 
>> 
>> 73
>> 
>> Jan
>> SP5XZG
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