[TenTec] Omni VI+ receiver UHF intermod

[Jack Mandelman]

While tuning across 20m ssb with my recently acquired Omni VI plus I 
noticed what first appeared to be S5-6 splatter from a nearby signal. 
After closer inspection I realized that it was an FM modulated signal 
centered at about 14.17980 MHz.  I then switched the radio to FM and was 
able to make out certain softly spoken words, although the signal was 
wideband FM while the Omni VI + is meant to receive narrow band FM.  The 
FM signal appears to be from a local UHF TV station operating on about 
635MHz.

To determine if the signal I was hearing was truly on the 20m band I 
listened on both a TS-940S and a TenTec CorsairII.  Neither the 940 or 
C2 heard any such signal.  Therefore I surmised I was hearing an 
intermod product generated within the Omni VI +.  I was able to 
eliminate the intermod by inserting an old Johnson Viking LP filter in 
front of the Omni VI+.

Has anyone encountered or heard of a similar UHF intermod problem with 
the Omni VI?

Jack K1VT