[ICOM] intermod

[D C *Mac* Macdonald]

It's not the IF filters, it's the intermodulation and
cross modulation products created by  STRONG
signals many MHz away that are created by simple
front end overload, just like much TVI and BCI.
To get rid of it, you  MUST  filter at the RF side.
The multiple signals are actually generated in your
receiver's front end if several  STRONG  signals
just bully their way in.

Mac, K2GKK/5



----Original Message Follows----
From: "W5JMW  John" <w5jmw at cableone.net>
Reply-To: ICOM Reflector <icom at mailman.qth.net>
To: "ICOM Reflector" <icom at mailman.qth.net>
Subject: Re: [ICOM] intermod
Date: Sun, 2 Oct 2005 18:37:07 -0500

Yes,I have a 2720 and a dr-620.The 2720 even opened has less intermod that 
the 620.Before I opened the 620 I received very little intermod.Once opened 
a signal abt 3 kcs away will break squelch.The 2720 is tighter than the 
620.If left stock then the built in filters work well...73,john



----- Original Message ----- From: "Michael P. Olbrisch" 
<mike2004 at elp.rr.com>
To: "'ICOM Reflector'" <icom at mailman.qth.net>
Sent: Sunday, October 02, 2005 6:28 PM
Subject: RE: [ICOM] intermod

>>-----Original Message-----

>>From: icom-bounces at mailman.qth.net
>>[mailto:icom-bounces at mailman.qth.net] On Behalf Of W5JMW John
>>Sent: Sunday, October 02, 2005 11:23 PM
>>To: ICOM Reflector
>>Subject: [ICOM] intermod
>>
>>The 2720 and the 208 are far superior to the alinco's.Once
>>you open them up
>
>Great - this is what I was looking for.  Can I assume from what you type
>above that a stock (unopened RX) 2720 isn't a bad radio?  I resigned from
>MARS a few years ago, I have no need for out-of-band stuff anymore.  And
>other than the WX stuff, little need for any public service either.
>
>>I believe all rigs will exibit the same problems.On the 2720
>>and the 208
>>just advance the squelch and that will work for most
>>applications.Same as
>>for the Alinco.A squelch setting of about 10 works well...my 2 cents
>>worth,john
>
>Thanks John.
>
>Mike.  KD9KC