[ARC5] ARC-5 Double Conversion

[DSP3]

One might also try modifying the three IFTs by moving the lower coil 
downward.  I wrote it up in ER magazine and it works great.  The BW on 
the 80 meter receivers is better than halved.  On forty meters, not 
quite as narrow but it really helps.  Not as good as using a second 
receiver, but......

Jeep - K3HVG


On 4/4/2018 6:52 PM, Phillip Carpenter wrote:
> I’ve got three articles, all from foreign countries, describing the double conversion of the ARC-5 receivers. One from the UK, one from Australia, and one from New Zealand.
>
> Basically the BC-454 or BC-455 were modified to replace the 2nd & 3rd IFs with the 1st & 2nd IFs from a BC-453. The 1st IF Amp (12SK7) was replaced with either a 12K8 or 12SA7 and wired as a 2nd mixer. Either a spare BFO can or a BC band oscillator coil was used as a 2nd Local Oscillator with frequency shifted 85 kHz. All three articles stated that the receivers worked great with very good selectivity.
>
> Has anyone done this modification here in the U.S. and were any articles written on it in US publications?
>
> I’d like to here from anyone who has done this or knows of US articles describing this change. The changes are all restorable.
>
> Thanks in advance to all who reply!
>
> Phillip W4RTX
>
> Sent from my iPhone
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/arc5/attachments/20180405/950f5971/attachment.html>