[ARC5] Using SCR-274N

[Geoff]

> On 28 Mar 2013 at 17:35, Geoff wrote:
>
>> A pair of surplus crystals and a few other small parts would help narrow 
>> the
>> bandpass on the wide open sets. It could all be done with a couple of 
>> tacked
>> in solder lug strips and easy to reverse. I havent looked at what is
>> actually available but it wouldnt hurt to look.
>
> Yes. Cheap and fairly easy to do, too. Good idea. I haven't done that one, 
> but I'll add it to my
> "bag of tricks".
>
>> Slight regeneration of an IF stage would also narrow it a bit without 
>> that
>> extreme hollow sound. No parts required maybe, just a gimmick feedback 
>> cap
>> grid to plate.
>
> I have done that to my 10 meter '454, and it does help very noticeably.
>
>> I believe Ken also mentioned that the 454 IF
>> transformers look possible to seperate the coils a bit.
>
> Yes. What I am going to do is to make take a bunch of photos of the 1415 
> Khz IFs as they
> are now, carefully measure the actual IF bandwidth, then "operate" on 
> them, reinstall, realign,
> and measure the resultant IF bandwidth. I expect it to improve, but am not 
> sure how much.
>
> Modifying the IF transformers would take about 15 minutes for each one, 
> and it is fully
> reversible.
>
> "No ARC-5 parts were damaged in the course of this investigation". (Hee 
> hee!) :-)
>
> Ken W7EKB


Thats the spirit!

Carl