[TenTec] RX-340 INTERMODULATION

[Carl Moreschi]

There is a known problem in the rx340 that causes the rx340 to hear an image
of one of its own IF's.  What you are describing sounds likes this problem
to me.  Tentec makes a shield that is easy to install that totally fixes
this problem.  Give a call to tentec and have them mail you this shield
along with installation instructions.  It is easy to install.

73,

Carl Moreschi N4PY
Franklinton, NC
----- Original Message -----
From: "Cantarelli, Dino" <DinoCantarelli at EATON.com>
To: <tentec at contesting.com>
Sent: Thursday, December 04, 2003 4:13 PM
Subject: [TenTec] RX-340 INTERMODULATION


>
>
>    Dino Cantarelli   I5XUZ
>
>     Via Monzoni 11   54036   Marina di Carrara
>     Italy
>
>     dinocantarelli at eaton.com
>
>
>   I am located in EUROPE and I own an RX-340   since May 2002.
>  One strange effect I have noticed is that on certain frequencies some
> birdies
>  are udible. They are spaced at 1 KHz interval and during the tuning
> operation
> they cannot zero beat.Once you approach few hundreds hertz the beat starts
> at high frequency again,and so on. The range from S3 up to S7.
>  At my location the effect is audible with the following antennas:
>    1) Explorer 14
>    2) Dipole 80 mt.
>    3 Dipole 160.mt
>
>   If I disconnect the antenna the problem is not present.
>
>  I have done some tests to isolate the problem and the only way to stop it
> is to
> put a good preselector before the receiver.
>  The frequencies involved are all the 40 mt. band and between 3.745 and
> 3.795 KHz.
>  USB or LSB gives the same result.
>  In ISB mode it's present only with beat frequencies of few hundreds hertz
> but it's still there.
>  I tought that it was almost impossible to induce intermodulation of
second
> or third order
>  in such a good receiver with antennas like dipoles,but that's it.
>
>  Does anybody have an idea of how this is possible ??
>
>  I add that my  TS440-S with the same antenna and the same preselector has
> no intermodulation
> effects at all.
>
>  Hello Dino
>
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