[Yaesu] FT1000MP problem - Does anyone know what it might be?

[Ron Youvan]

   Robert KQ2M Shohet wrote:

> I am trying to diagnose a problem with one of my ‘MP’s......

> It ran hot and shut down in CQWWCW last year.  Today it worked fine on 20, but on ALL OTHER BANDS, the receive audio was down 2-3 s-units and the SWR was infinite.  On 20 the SWR was near flat and receive audio was normal.  I repeated this “experiment” several times finally just hooking up one antenna at a time directly to the back of the radio to bypass all other switches, cables, switching devices, etc.  Same result – on 20 it was fine and on all other bands it was down 2-3 s-units and the SWR was infinite.

> I then swapped in another ‘MP to the position that the ailing radio had vacated, and the swapped ‘MP worked perfectly.

> So it is clearly the ailing radio (and not any other devices) that has an issue or multiple issues.

> Has anyone run into this type of problem before?  Does anyone know what could be wrong with my ‘MP?

> Please let me know.  Tnx & 73

   Was that test performed with the auto antenna tuner switched off?

   This kinda sounds like you lost a ground between the antenna jack (or
the antenna switch) and where the signal for the receivers is taken off.
-- 
   Ron  KA4INM - Youvan's corollary:
                 Every action results in unwanted side effects.