Re: [IRCA] Drinking the Kool-Aid, Jumping on the Couch

["Mike Westfall, Lost Almost NM" <mwdx@xxxxxxxxxx>]

The M37V does indeed suffer from images when in the presence of strong
RF. That's a problem common to most digitally tuned single conversion
radios, because they lack tuned front ends which most analog tuned
radios have.

Today I took the unit and parked about a hundred yards from the
antenna of my local KRSN 1490, which is running 640 watts. Strong
image on 590 kHz (but it could be nulled into oblivion!) The image
went away after I moved about a mile on down the road.

The next strongest signal is from KSWV 810 in Santa Fe. While I was at
the KRSN tower site, I checked for mixing products at 1490-810=680 kHz
and heard nothing. OK, so maybe KSWV is just too far away to cause
intermod with KRSN.  Fine with me!

Images and intermod could likely be dealt with by using the radio in
conjunction with a tuned loop. That's something I haven't tried yet,
though.

In order to test the intermod better, I'll have to go to Santa Fe
where there are 2 or 3 radio stations sharing a tower. If I park near
it, that should bring out any intermod products.

I'm lucky, I guess, that I don't live near any powerful stations. The
local is several miles away from where I live so it doesn't bother me
too much. At home, I notice no images anywhere on the band.



On Jan 4, 2008 7:07 PM,  <D1028Gary@xxxxxxx> wrote:
> Russ,
>
>      The 2007 Shootout (on dxer.ca) revealed that both  the SRF-59 and the
> Sangean DT-200VX perform very well in RF-intensive  environments.  Neither
> showed any images, and there was only one very weak  spur on each receiver.  The
> stock SRF-M37V, on the other hand, has both  image and selectivity problems
> (full list on the review), but Mesa Mike's narrow  filter modification may cure
> the selectivity issue.


-- 
Mesa Mike
LA de NM
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