Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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You don't need the extender cards to make the adjustment, they have to
be made with the VCO card in place. What you DO need is the "jumper"
board that goes over the VCO board to replace the logic line connections
lost when you unplug the DR-7!
A nice set of boards are available at
<http://incolor.inetnebr.com/jshorney/tr7ext.htm>
What frequencies do you get when the VCO is run "open loop" per the
manual section 3.7?
As long as the VCO locks reliably when you change bands, the VCO's are
"close enough".
73, Garey - K4OAH
Atlanta
Drake C-Line Service Manual
<http://www.k4oah.com>
[EMAIL PROTECTED] wrote:
[EMAIL PROTECTED] made an utterance to the drakelist gang
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It appears [from the indications in the service manual] that my VCO
needs alignment. I've removed the DR7 and the front circuit card
shield cover. The SM states that in order to adjust L501 and L502 one
needs the jumper board and the extender cards. Is this true for taking
the measurement at the test point, as well?
I'm getting 22.6V [14MHz] and 22.7[28.5MHz] for readings at the test
point on the VCO board, but this is of course with the DR7 and the
shield cover removed. Are these measurements bogus unless the extender
cards and jumper board are in place? Or, can I just go ahead and
adjust L501 and L502?
Thanks.
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