[Milsurplus] Military Receiver R105A/ ARR 15 question

[Al Klase]

Dennis,

You're a troublemaker.  Now I'm wondering if there's room for a 51J4 
filter module inside that thing.

Yes, the basic problem is broad IF.  Probably that way so the autotune 
could work every time.  As is, the RX isn't much good at separating 3885 
from 3875.

Al


On 5/1/2010 2:01 PM, mac wrote:
> Good description of the radio.  Biggest problem for ham use, though, 
> is the tunable IF strip required to accommodate the calibrate/autotune 
> cycle which results in about a 20 kc receiving bandwidth.  Myself and 
> others have considered a mod to switch a 500kc mechanical filter in 
> line at the conclusion of the cycle but have heard no reports on 
> anyone having actually done this.
>
> Dennis D. W7QHO
> Glendale, CA
>
>
>
> On May 1, 2010, at 9:47 AM, Al Klase wrote:
>
>> Hi Greg,
>>
>> Nobody else spoke up, so I'll see what I can do.
>>
>> This receiver uses the Collins Autotune system to accommodate 10 preset
>> channels.  With the wing nuts on the tuning and bandswitch knobs
>> loosened, it can be tuned manually.  In this mode there is no detente on
>> the band switch, so the half-way-in-between condition in the picture is
>> probably OK.
>>
>> The small window on the upper left is the "BFO-Calibrate" indicator.
>> The knob below tunes the entire IF and the BFO +/- 50KC form the 500KC
>> IF.  When this control is turned away from it's center detente, the
>> antenna is disconnected and a 100KC calibrator is turned on.  If for
>> instance if you want to tune the set accurately to 3520 KC, you set the
>> BFO-Calibrate control to +20 and zerobeat using the main tuning control
>> in the vicinity of 3500 KC.  Then when  BFO-calibrate is returned to
>> zero, the set is on the air at 3520.
>>
>> I have one of these in storage.  It strikes me as more of a curiosity
>> for the Collins collector who wants one of everything, and you might be
>> happier with an BC-348 for everyday use.  Of course it will coordinate
>> with the autotune in the ART-13 and it's kinda cool to watch it click
>> and whir it's way to the next frequency.
>>
>> 73,
>> Al
>> ,
>>
>> On 4/30/2010 10:12 PM, Greg Mijal wrote:
>>> Hi:
>>>
>>> I've been looking at an ARR 15 receiver listed on Ebay.  I'm 
>>> thinking about mating it to my ART 13 for 75 M phone.
>>> Ebay auction number is: 230 467 619 002
>>>
>>> I'm not very familiar with this model and would like someone who has 
>>> experience with it take a look and answer a couple of questions.
>>> The right side widow looks like it is between bands.  Could this be 
>>> normal or is something mechanically lacking?
>>> Also, what is the purpose of the small left side window?
>>> Thanks for your help
>>> Greg
>>> WA7LYO
>>> Kinston NC
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>>
>> -- 
>> Al Klase - N3FRQ
>> Jersey City, NJ
>> http://www.skywaves.ar88.net/
>>
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-- 
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/