I ad a similar problem with a TR7. It was a defective 25 volt regulator
on the PS board.
On 8/1/2015 12:00 PM, [email protected] wrote:
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Today's Topics:
1. R7 Tuning Instability (Arthur Delibert)
2. Re: R7 Tuning Instability (Gary Poland)
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Message: 1
Date: Fri, 31 Jul 2015 17:49:42 -0400
From: Arthur Delibert <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [Drakelist] R7 Tuning Instability
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
I have a Drake R7 that sometimes displays an instability on the higher
frequency bands when I first turn it on. On the 21 and 28 MHz bands the
frequency reads as 16xxx kHz or 32xxx kHz, and continually increases, as if the
radio is slowly counting something. The lower frequency ranges act normally.
The same thing happens on the Aux7 frequencies that use 21 MHz band selector
setting.
The problem continues for about 5 minutes, and then the radio settles down and
acts normally on all bands.
I've tried cleaning the switch contacts on both the band selector switch and
the Aux Program switch, but that didn't seem to make any difference.
Any thoughts?
Thanks.
Art Delibert
KB3FJO
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Message: 2
Date: Fri, 31 Jul 2015 19:19:49 -0400
From: "Gary Poland" <[email protected]>
To: "Arthur Delibert" <[email protected]>, <[email protected]>
Subject: Re: [Drakelist] R7 Tuning Instability
Message-ID: <9969F516F90B42699894D368F559686C@Inspiron580>
Content-Type: text/plain; charset="utf-8"
Arthur,
Check the 25 volt DC input from the power supply board to the VCO. If that
voltage is low the VCO doesn?t have the range it needs to tune the 10 and 15
meter bands. If your power supply board is the older type with the dc to dc
converter, check the core on the transformer to make sure it hasn?t slipped out
of position. The voltage should be between 23 and 24 volts if I remember right.
73, Gary
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