[UK-CONTEST] FT1kmp partially dead

[Andrew]

John,

You can get a copy of the Technical Supplement (4.8Mb) for the FT1000mp
here http://www.va3cr.net/manuals/Material/Technical%20Supplement.pdf
which gives details of how to check the alignment of the PLL Loop VCO
(page 15 labelled as 3-3) and the PLL Main Loop VCO (page 17 labelled as
3-5).

It also appears the FT1000mp uses 11 BPFs so it's unlikely that one BPF
would cover both 30M and 20M.  Unfortunately, I've yet to find the
frequency range each one covers and I don't have my MP here to check
where they switch....

Regards,

Andrew AC6WI (GI0NWG)


John Lemay wrote:
> John
> 
> Probably the best place for help is the FT-1000 reflector.
> 
> However, I had a similar problem, affecting different bands from yourself. I
> was given help and a small extract of the FT-1000 Technical Supplement,
> which enabled me to mend my own FT-1000MP.
> 
> First, here is the coverage affected by the 4 VCO's for the main receiver:
> 
> 0.1 to 7.499MHz
> 
> 7.5Mhz to 14.499MHz
> 
> 14.5MHz to 21.999MHz
> 
> 22MHz to 30MHz.
> 
> So, you can now easily check to see if your "dead" rig has failed between
> these precise limits. My problem was the 14.5 to 21.999 VCO, which had
> stopped oscillating due to dry joints. It's a problem that is quite well
> known.
> 
> Meanwhile, I'll search for the email which helped me in the hope I can pass
> it on.
> 
> Regards
> 
> John G4ZTR
> 
> 
> -----Original Message-----
> From: uk-contest-bounces at contesting.com
> [mailto:uk-contest-bounces at contesting.com] On Behalf Of John Wayman
> Sent: 08 December 2007 17:54
> To: UK Contest Reflector
> Subject: Re: [UK-CONTEST] FT1kmp partially dead
> 
> Sorry for the Off-Topic stuff, but so many of you have or used to have
> FT1kmp, I thought this was the best place to ask.
> Further investigation reveals that the sub-rx works fine on all bands.
> I believe this would indicate that the correct VCO is not being selected on
> the Local Unit, or that the correct VCO has stopped working, so the 1st
> mixer does not get the right frequency to produce the 70MHz 1st IF. Problem
> is, I can't find anything that tells me the frequency bands that the 4
> different VCO's correspond to. Without this information, I am groping in the
> dark a bit. If 30 and 20m share a VCO with each other and with no other
> bands, then I am probably looking in the right area. If not, back to the
> drawing board. If you know which VCO corresponds to which band, please let
> me know.
> Next step is to get poking about with the frequency counter, I think...
> It's all very exciting.
> 
> 73,
> 
> 
> John
> 
> John Wayman <g4drs at btinternet.com> wrote: Hello,
> I'm looking for an expert who can point me towards the most likely reason
> for my FT1kmp to stop working on 30 and 20m, both on receive and transmit,
> whilst continuing to work on the other bands.
> My guess is one of the relays that switch the bandpass filters, but you may
> be able to save me the whole fault-finding thing, either by saying 'Yes,
> that's what was wrong with mine.' or 'No, mine was the xxx.'
> Thanks for reading.
> 
> 73
> John
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