[ARC5] ARC-5/SCR-274-N IF Coil Mod -Continued

[D. Platt]

All comments well taken.  My first attempt at quantifying the results 
are generally anecdotal.  That is, things sure sounded better and 
sharper.  I did do a manual insertion and take scope readings going into 
the detector.  What I need to do, of course, is sweep the front end and 
record the resultant response.  I have a 141T spectrum analyzer with the 
1 GHz plug-in and a couple of 8640's but I really need a usable sweep 
generator.  Better late than never!  I see some that would be OK for 
I.F. work and up to about 5 MHz, so I'll proceed with some sort of a 
procurement.

Jeep - K3HVG

On 3/11/2014 2:04 PM, Kenneth G. Gordon wrote:
> On 11 Mar 2014 at 13:30, D. Platt wrote:
>
>> So far, thiese mods
>> have genuinly helped with selectivity.....
> Can you give us some figures? 6-60 db figures, etc? Before and after? It is
> most likely that the 60 db figure will not change much since in LC circuits that
> is determined by the IF frequency, but the 6 db point should be very
> noticably improved.
>
> According to info I have here which originally came directly from ARC, they
> were even able to obtain 6 db selectivity in the 6 - 9.1 MHz receivers at that
> 2830 KHz IF of 3 KHz. I was amazed.
>
> But, I am not sure that they didn't do something else too, but the info I have
> was that they only adjusted the IF coil spacing.
>   
>> Does anyone think a submission to ER, probably with photos,
> AND with corroborating test data...
>
>> might be
>> informative?
> As the saying goes, "Ab-so-freakin'-lootely!" In fact, I had proposed just such
> an article to Ray at ER some time ago, but have so far not been able to do
> anything about it.
>
> You are far more along in that project than I am.
>
> I have already sent him at least 3 other articles, one quite long with lots of
> photos, on our favorite receivers and he will publish those in due course.
>
> Your article would be a very welcome addition to the others.
>
> Please do that.
>
> Ken W7EKB
>
>