Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Hi Sindre -
Interesting......
Can you tell if the six diodes are perhaps in series, three in series
one way and three in series the other way across the antenna.?
Perhaps it rectifies big RF and biases PIN diodes with it? (Not
likely) The coil is probably to tune out the capacitance of the
diodes across the antenna?
Any chance of a high resolution photo of the board? Thanks for
checking, at least now we know what it's NOT! :-)
73, Garey - K4OAH
Atlanta
Drake C-Line Service Manual
<http://hr99.home.mindspring.com/R-4C_Servicez/>
Sindre Torp wrote:
"Sindre Torp" <[EMAIL PROTECTED]> made an utterance to the drakelist
gang
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Hi all,
I don't have any schematics for the the RP500 or RP700.
But I opened a sealed box with a RP700 today. No schematic inside, so
therefor I opened the RP700 !
There's a small printed circuit board with 2 ceramic disk capacitors,
1 coil with 5-6 turns, 6 diodes of the same kind and 2 other very
small diodes (most likely).
There's no gas discharge surge protector.
73,
Sindre, LA6OP
----- Original Message ----- From: "Garey Barrell" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Tuesday, June 21, 2005 10:39 PM
Subject: Re: [drakelist] Receiver protector schematic needed.
Garey Barrell <[EMAIL PROTECTED]> made an utterance to the
drakelist gang
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Craig -
I've never actually seen one of these, but I suspect that it may be
nothing more than a gas discharge surge protector in a box with a couple
of connectors on it. These were added to the TR-7 after a while, and
probably the R-7 as well.
The one used in the TR-7 was a CG90L, available from Mouser for about
$4. These have <1 pF capacitance so wouldn't have any effect on an
HF/VHF receiver.
If you get any "real" information, I'd be interested in it!
73, Garey - K4OAH
Atlanta
Drake C-Line Service Manual
<http://hr99.home.mindspring.com/R-4C_Servicez/>
Craig Roberts wrote:
Craig Roberts <[EMAIL PROTECTED]> made an utterance to the
drakelist gang
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I am looking for the schematic for a Drake RP-500 or RP-700 receiver
protector, please.
Many thanks and 73,
Craug
W3CRR
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