Mutek TVVF57a Transverter

Questions and answers on 4 m transceivers, transverters, antennas, etc.

Mutek TVVF57a Transverter

Postby GM4AFF » Wed 15 Nov 2017, 12:46

Does anyone have a circuit diagram of the Mutek TVVF 57a (6m and 4m) transverter, or perhaps know where I can find one? I'm only interested in the PA stage.

Thanks!
Stewart GM4AFF
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Re: Mutek TVVF57a Transverter

Postby GW8IZR » Thu 16 Nov 2017, 21:40

I'm sorry I can't help Stewart but some background. A friend bought one second hand which turned out to be faulty. I had a look at it but failed to make much progress with it. There were some tracking faults that convinced me the 4m section could never have operated. Chris 'DGU had no information at the time either.

Anyway long story short I was never going to invest enough time or effort to sort it so it was sent to the 'new' owner of one of Mutek's incarnations for repair.

He couldn't find any documentation or information and I'm fairly sure the unit is still on the scrap pile or been disposed of 10 years later.

Hopefully you will have more success.

73 de Paul
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Re: Mutek TVVF57a Transverter

Postby GM4AFF » Thu 16 Nov 2017, 22:24

Hi Paul,
Having searched the internet fairly thoroughly and not really found anything, I suspected that I was on a hiding to nothing! But it's worth a try. I can see a burnt out resistor on the board near the PA. I wish I knew what its value was and what the PA transistor was/is, which has probably failed and taken the resistor with it. A search for the numbers on the PA device returns nothing sensible.
Pity, because the receive side seems to be working well. Only slight drawback for some might be the 28v DC requirement.
Someone somewhere will know about these things! Strange and sad that Chris's original documentation has disappeared.
73
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Re: Mutek TVVF57a Transverter

Postby GW8IZR » Fri 17 Nov 2017, 07:30

I do have a Mutek VHF 2m PA of the same vintage which I use as a pre driver for the PA, its a 28V fet and from what I remember its remarkably similar to the transverter - send me a photo of the area of the PA with damage and I'll look to see if any info can be obtained from my PA, if its bias or supply related we may be able to make some conclusions. Its worth a try.
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Re: Mutek TVVF57a Transverter

Postby GM4AFF » Sun 19 Nov 2017, 13:49

Paul,
I've sent you an email with some photos attached.
73
Stewart
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Re: Mutek TVVF57a Transverter

Postby GW8IZR » Mon 20 Nov 2017, 20:03

OK Stewart, by now you should have received my reply and photo, sorry to disappoint but it was worth a try.

I asked Steve 'GEI if he had his faulty one back and he's confirmed that he never got it back so thats a dead end as well.

With those resistors you can often make contact with the spiral track part way along and try to assess the resistance from each end of the o/c bit. Combine that with any colours you can make out and you might get there.

If its the bias supply its value might not be too critical +/- a bit as you can adjust.

HTH

73 de Paul
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Re: Mutek TVVF57a Transverter

Postby GW8IZR » Wed 6 Dec 2017, 19:29

Hi Stewart, were you able to progress with the other helper, be nice to know if its fixed yet?

Regards Paul
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