[ARC5] Selectivity and the BC-455

[Brian]

I don't think there is a single-coil IFT in any 6-9 mcs Command Rx, whether 
ARC-5 or SCR-274-N family.
All the circuit diagrams I have for both show all IFTs with two coils.
73 de Brian, VK2GCE.

-----Original Message----- 
From: DSP3
Sent: Friday, October 24, 2014 8:21 PM
To: arc5 at mailman.qth.net
Subject: Re: [ARC5] Selectivity and the BC-455

Ken,

Now that's a new twist on the subject.  Truth told, I have never seen a
single-coil ARC-5/274-N receiver, but then again, its only recently that
I've been actually disassembling them.   If there is only one coil, no
wonder the selectivity is "less than what might be desired".   Which
manual carries that design, if you or anyone can pass on?

Regards

Jeep - K3HVG

On 10/23/2014 8:32 PM, Kenneth G. Gordon wrote:
> On 23 Oct 2014 at 18:25, DSP3 wrote:
>
>> Gents,
>>
>> If I may say without seeming to toot a horn I just blew into..... The ER
>> Article I did a few months ago on the R-26 and the BC-454 selectivity
>> mod, I just did another R27 and it really did improve things, a lot.  I
>> have not done the quantitative measurements, yet, but I can say that the
>> 40 meter band does sound a lot better.  Along with a non-destructive
>> bracke- mounted Jackson drive, its a pleasure to tune, now.  Just a
>> couple of thoughts.....
> Jeep:
>
> Many (most?) of the "40 meter" receivers have only ONE coil in the IF 
> stage,
> not two, like there are in the lower frequency jobs.
>
> Ken W7EKB
> ______________________________________________________________
>

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