I had the same problem with my Ten-Tek Corsair II when I first became
active on 160 meters. The problem went away when I was listening on my
transmit antenna. I surmised the problem was RF getting back into the
"unprotected" receiver antenna input, which is where the loops and
beverages were connected. The problem was initially cured by shorting out
that input during transmit.
----------
> From: Earl W Cunningham <k6se@juno.com>
> To: topband@contesting.com
> Subject: TopBand: Receiver Survey Follow-up
To: <topband@contesting.com>
> Date: Wednesday, February 11, 1998 22:37
>
> Klaus, DJ6RX gave me permission to post this message he sent to Riki,
> 4X4NJ. It seemed fair to let others see his comments about the FT-1000MP,
> TS-930, FT-1000D, and R-4C.
>
> 73, de K6SE
> ===================
> On Mon, 9 Feb 1998 16:17:24 EST Dj6rx@aol.com wrote:
>
> "Riki,
> Be aware the F-T1000MP creates spurious output on 160. Yaesu told me
> they can't improve it. My FT-1000MP was in for service 3 times after I
> got complaints from EU stations hearing my CQs simultaneously on two or
> three frequencies (loud) on the band. I sold mine after 12 months. The
> DSP did not improve receiving that much, QSK was worse than with the old
> TS-930. The RX was not usable on my log periodic without additional
> external bandpass filters.
>
> Now I have a new FT-1000D. The transmit signal is Ok, QSK is better. It
> also needs an external bandpass filter when using the log periodic.
>
> On 160/80 with STRONG signals nearby (1..2 KHz away from the passband) I
> hear some funny mixed CW signals. The loud CW signals mix somewhere and
> the sum or difference appears in the passband. This is a problem the
> FT-1000MP did not have (nor the old TS-930).
>
> I sold my Drake C-Line a long time ago for the same reasons you
> mentioned. And I'm sorry I did sell it. The R-4C was great for weak
> signal work on the low bands. DJ8WL still uses his Drake RX! Don't give
> it away.
>
> Thanks for the SIXER during the Marathon. Did not go full time, but had
> fun
> though low band conditions were lousy here.
>
> 73 / Klaus"
>
>
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