[ARC5] AN/ARR-69 inquiry

[zakariya.abu at yandex.com]

Thank you, Scott!

W dniu 24.03.2024 o 18:55, scottjohnson1 at cox.net pisze:
> Since Francesco is busy yacking to me on the phone, I will answer.  The ARA-25/50 are very effective, and are typically used LOS, and in the 225-400 MHz they are quite accurate.
> Many downed pilots and aircraft (as well as ELTs going off on the ramp) have bee located with these adapters.
> 
> Scott W7SVJ
> 
> -----Original Message-----
> From: arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> On Behalf Of zakariya.abu at yandex.com
> Sent: Sunday, March 24, 2024 10:44
> To: Francesco Ledda <frledda at att.net>; ARC-5 <arc5 at mailman.qth.net>
> Subject: Re: [ARC5] AN/ARR-69 inquiry
> 
> Francesco,
> 
> Thanks again for the follow up. I wonder actually what was the purpose of mass-installation of the ARA-25 and ARA-50 UHF DF sets if these were only to give bearing to another plane in flight or to an ELT on the ground? It's obviously nice that the equipment was available on many planes, but I wonder if the rather poor sensitivity eg. of the ARR-40 of some 6 microvolts limited the SAR/CSAR mission success? Do you happen to know the answer?
> 
> 73,
> 
> Jan
> SP5XZG
> 
> 
> W dniu 24.03.2024 o 17:04, Francesco Ledda pisze:
>> I stand corrected. In the F-4, the aux receiver could be used with the DF system.
>>
>> Best, Francesco K5URG
>> Sent from my iPad
>>
>>> On Mar 24, 2024, at 10:39, zakariya.abu at yandex.com wrote:
>>>
>>> Thank you very much indeed, Francesco! Have a peaceful Sunday.
>>>
>>> W dniu 24.03.2024 o 12:58, Francesco Ledda pisze:
>>>> 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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