[MRCA] R-105/ARR-15 mod?

[B. Smith]

73 Magazine archive is available on line.
Z

On 6/7/2024 8:29 PM, Jeep Platt wrote:
> As I recall, the mode and calibration switches were broken out such 
> that BFO, the audio cw filter, AVC, and calibrator were provided 
> individual switches. I think there was also motor off/on. Wish I had 
> the article still. If you look at an unmodified unit, you can see that 
> some knobs are "missing". I also thing RF gain was made a non-recessed 
> control.. maybe.
> K3HVG
>
> Sent from my Verizon, Samsung Galaxy smartphone
> Get Outlook for Android <https://aka.ms/AAb9ysg>
> ------------------------------------------------------------------------
> *From:* scottjohnson1 at cox.net <scottjohnson1 at cox.net>
> *Sent:* Friday, June 7, 2024 8:05:11 PM
> *To:* 'Jeep Platt' <jeepcomms at outlook.com>; MRCA at mailman.qth.net 
> <MRCA at mailman.qth.net>
> *Subject:* RE: [MRCA] R-105/ARR-15 mod?
>
> I am pretty sure Collins intended the ARR-15 to be channelized with 
> the ART-13, but I have never seen an installation that took advantage 
> of it.  It works well!
>
> Scott
>
> *From:*Jeep Platt <jeepcomms at outlook.com>
> *Sent:* Friday, June 7, 2024 12:35 PM
> *To:* scottjohnson1 at cox.net; MRCA at mailman.qth.net
> *Subject:* Re: [MRCA] R-105/ARR-15 mod?
>
> I see photos of it in P5M, P2V,  and a few other Navy heavies.  
> Curious, the T.O. references the Navy and USAF. In the mid 60s, we got 
> a bunch of them at the MARS station at Dover after a surplus run from 
> Westover.  Never saw one in USAF use.
>
> K3HVG
>
> Sent from my Verizon, Samsung Galaxy smartphone
> Get Outlook for Android <https://aka.ms/AAb9ysg>
>
> ------------------------------------------------------------------------
>
> *From:*scottjohnson1 at cox.net <scottjohnson1 at cox.net>
> *Sent:* Friday, June 7, 2024 3:27:38 PM
> *To:* 'Jeep Platt' <jeepcomms at outlook.com>; MRCA at mailman.qth.net 
> <MRCA at mailman.qth.net>
> *Subject:* RE: [MRCA] R-105/ARR-15 mod?
>
> Jeep-
>
> I have that configuration as well at my QTH, set up for channelization 
> using the ART-13 remote control.
>
> Do you know what in what aircraft configuration the ARC-25 was used?
>
> Scott W7SVJ
>
> *From:*mrca-bounces at mailman.qth.net <mrca-bounces at mailman.qth.net> *On 
> Behalf Of *Jeep Platt
> *Sent:* Friday, June 7, 2024 12:17
> *To:* W2HX <w2hx at w2hx.com>; Army-Radios at groups.io; k2ajr--- via MRCA 
> <mrca at mailman.qth.net>
> *Subject:* Re: [MRCA] R-105/ARR-15 mod?
>
> The mod, in general, appeared in 73 magazine in the 1960's.  It is/was 
> an unnecessary hack job, I believe. The ARR-15(  ) can be used even 
> with its very broad IF. An outboard Q-5er works quite well. There is 
> an internal cw audio filter of some slight usefulness. The mod brought 
> imbedded mode functions to the front panel. The only mod one would 
> need to possibly do is attach fil and B+ to the dynamotor pins via a 
> rear panel plug as the organic mating connector is unobtainium.  The 
> dual PTO design is interesting. My ART-13/dual ARR-15 (ARC-25) setup 
> now in ops at W1NZR.
>
> Jeep K3HVG
>
> Sent from my Verizon, Samsung Galaxy smartphone
> Get Outlook for Android <https://aka.ms/AAb9ysg>
>
> ------------------------------------------------------------------------
>
> *From:*mrca-bounces at mailman.qth.net <mrca-bounces at mailman.qth.net> on 
> behalf of W2HX <w2hx at w2hx.com>
> *Sent:* Friday, June 7, 2024 1:46:22 PM
> *To:* Army-Radios at Groups.io <Army-Radios at groups.io>; k2ajr--- via MRCA 
> <mrca at mailman.qth.net>
> *Subject:* [MRCA] R-105/ARR-15 mod?
>
> Hi all, I was browsing ebay and came across this ARR-15 and noticed 
> someone ham-mered the front panel with a column of switches down the 
> left side.
>
> https://www.ebay.com/itm/166778324274
>
> then I saw another one just like it, but better done!
>
> https://www.ebay.com/itm/115721014547
>
> I got to wondering, was this a common mod? Anyone know what it is for 
> (maybe switching attenuation in/out?) or was this an official mod or 
> something?
>
> Thanks
>
> 73 Eugene W2HX
> My Youtube Channel: https://www.youtube.com/@w2hx/videos 
> <https://www.youtube.com/@w2hx/videos>
>
>
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