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 Post subject: The Wonderful Ranger Clamper
PostPosted: Feb Thu 22, 2018 6:16 pm 
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Joined: Jan Mon 25, 2016 3:13 am
Posts: 134
Location: Allen, TX
OK I'm back but this time confused about a Ranger clamper.

It's the early version with no keyer, however, a PTT relay has been installed properly per the manual.

Drive to the final and the final itself all tunes properly when I key the mic in phone position. However. when I unkey and leave the function switch in Phone position the plate current pegs.

It seems like an obvious clamper problem so I did the clamper test by removing drive (switching to an unused crystal). The clamper reduces the plate current (actually clamper current I know) properly to about 50 ma in the CW mode, but has no effect in AM mode because the plate current stays pegged. Or, as soon as I release the PTT the plate meter pegs in the AM mode.

For the life of me I can't see why the clamper works in the undriven CW mode but not the AM mode. Can anyone enlighten me?

Thanks in advance.

Rick
W5RAA


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 Post subject: Re: The Wonderful Ranger Clamper
PostPosted: Feb Thu 22, 2018 6:56 pm 
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Joined: Jun Sun 19, 2011 2:31 pm
Posts: 5465
Rick,

Check you PTT switch wiring. The feed to the final screen should be grounded with the relay in standby position (look at terminal 6 SW4A connection) and the clamper circuit is not involved in controlling the plate current in standby, it is only designed to operate in transmit mode with loss of excitation.

Rodger WQ9E


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 Post subject: Re: The Wonderful Ranger Clamper
PostPosted: Feb Fri 23, 2018 1:52 am 
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Joined: Jan Mon 25, 2016 3:13 am
Posts: 134
Location: Allen, TX
Well...I tried to check the relay wiring, but picture this! Somebody did a very nice job of rewiring this Ranger WITH ALL WHITE WIRES!

So, that mass of white wires coming out of the bottom of the function is a bit overwhelming...I'll save this one for another day.


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 Post subject: Re: The Wonderful Ranger Clamper
PostPosted: Feb Fri 23, 2018 7:59 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3465
Location: Monterey California USA
That must have been the same guy who built a Russian HF CW transceiver I was reverse engineering once, about a century ago. All the wiring was red wire, and I mean all of it. :(

_________________
WB6NVH
California Highway Patrol Radio
Bell System Mobile Telephone History
http://www.wb6nvh.com


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 Post subject: Re: The Wonderful Ranger Clamper
PostPosted: Feb Fri 23, 2018 1:26 pm 
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Joined: Jun Sun 19, 2011 2:31 pm
Posts: 5465
I have a Telefunken E-1501 receiver that is constructed with the different receiver sections on cards. The interconnecting data/control lines (factory wired) are all white and look like a mass of spaghetti shoved in behind the front panel of the receiver. Mine also has an after-market board to add memory and it replaces the RTTY tuning display; at least that one uses different colored wire.

Rodger WQ9E


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