[ARC5] ARC-2 Defines "Broad as a Barn"

[mac]

The ARR-15 uses the variable IF feature only during the CAL  
(calibration) mode. A while back someone on these lists described a  
modification that switched a mechanical filter into the IF chain when  
operating in the RECEIVE mode and out for CAL.

Dennis D.  W7QHO
Glendale, CA

**************
On Mar 22, 2014, at 1:40 PM, millerke6f at aol.com wrote:

> Hi
>
>
> Same problem with the R105/ARR15   clever radio with the variable IF  
> and all, but no selectivity as such.  You might want to employ  
> regeneration in one of the IFs.  It's an easy scheme to apply and  
> easy to remove and you can set the regen level and leave it set so  
> no holes are required if you leave the pot inside and just glued to  
> something with E6000 glue.  This was a common trick back in the  
> "Modify Days" of surplus.
> I guess it's time to dig out my ARC2 and fire it up again.  Now if I  
> can just find my 28/50 amp supply?
>
>
> 73
> Bob, KE6F
>
>
>
> -----Original Message-----
> From: Kenneth G. Gordon <kgordon2006 at frontier.com>
> To: ARC-5 <arc5 at mailman.qth.net>
> Sent: Sat, Mar 22, 2014 11:55 am
> Subject: Re: [ARC5] ARC-2 Defines "Broad as a Barn"
>
>
> On 22 Mar 2014 at 8:08, Kenneth G. Gordon wrote:
>
>> On 22 Mar 2014 at 0:33, David Stinson wrote:
>>
>>> I have not done any alignment on the IF,
>>> so the results shown in this chart are "as found:"
>>> http://home.netcom.com/~arc5/ARC-2/ARC2IFOrig.jpg
>>> I think "W-I-D-E" is putting it mildly ;-).
>>> So this is my starting-point for my fiddling-to-come.
>>>
>>> Impressions, suggestions?
>>
>> Looks about what I had expected.
>>
>> What is the IF frequency?
>
> Well, I just tried fo find my copy of the ARC-2 manual, and  
> can't...at this
> point. I was reminded that the ARC-2 has a variable IF: i.e., it  
> varies as you
> tuned the range. This, of course, makes it unlikely that a "Q-5er"  
> will work
> with it.
>
> Secondly, I was also reminded that there is a way to non-destructively
> narrow up the IF by "adjusting" some coupling capacitors or parallel
> resistances in the circuit, but I have no details on that either.
>
> Still looking...
>
> Ken W7EKB
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