[Milsurplus] [ARC5] Improving RU Selectivity.

[Todd, KA1KAQ]

Nice. I've yet to fire up my RU-16 and wasn't expecting much. Your
configuration seems to be on par with many other receivers of that time
frame, albeit with a bit more user input. Something to look forward to.

~ Todd/KAQ

On Mon, May 22, 2017 at 11:35 AM, arc5 at ix.netcom.com <arc5 at ix.netcom.com>
wrote:

> Was listening to a 75-meter AM QSO with the RU-15 receiver this morning.
> There were the usual SS-SOBs needlessly crowding the AM Window.  Made a
> short video of how easily one can improve the selectivity of the receiver
> with just a piece of wire and a few minutes spent fiddling with it.
>
>
> Ran a wire from the antenna post to near the third tube from the rear.
> Adjust how much wire, how near the tube.  Fine-tune with the ANT TUNE
> knob.  It's touchy- too much coupling will motor-boat.  Regen will also
> pull the tuning some so you'll need to zero-best.  When you find the "sweet
> spot," you can easily hear the "rushing noise" as you tune across each
> sideband of the AM signal.  In fact, you can get it TOO narrow, distorting
> the audio.  The improvement can be dramatic.  Here's the video:
>
>
> https://goo.gl/photos/wBK2dKmkFukYjR3A9
>
>
> 73 Dave AB5S
>
>
> P.S. Once you get it narrowed on a carrier, it's much easier to zero-beat
> the BFO correctly.
>
>
> Sent from my Ain't Smart Phone.
>
>
>
> ______________________________________________________________
> 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/milsurplus/attachments/20170522/d7d934a9/attachment-0001.html>