{Collins} Re: FW: Strange 30L-1 effect



Hello all,

Well, A bad 811-A will cause the relay to close upon turning the amp on and this will kill most of the receive. Just my over 35 years observations.

John

"Freeberg, Scott (STP)" <Scott.Freeberg@xxxxxxxxxxx> wrote:

>I sent this yesturday to the list but I got back a 'mailbox' full error =
>message, so I don't think it made it.  I'm resending. =20
>
>-----Original Message-----
>From: Freeberg, Scott (STP)=20
>Sent: Thursday, January 13, 2005 8:35 AM
>To: 'Lance@xxxxxxxxxxxxx'; collins@xxxxxxxxxxxxx
>Subject: RE: {Collins} Strange 30L-1 effect
>
>
>Hi Lance, The 30L-1 antenna relay is normally closed when the relay is =
>unactivated, and its unactivated when either the AC power is off, or AC =
>power is on and the relay coil is not grounded. =20
>
>A separate secondary winding provides power for the relay and a negative =
>grid bias for the 811's.  To active, the relay line is pulled up to =
>ground.
>
>If you are getting normal receive signals when power is off, and lose it =
>when power is applied, then the antenna relay is being energized as soon =
>as you turn the amp on.  What could cause this?  Likely the solid state =
>transceiver interface is not compatible with the amplifier relay drive =
>requirements.  First off I'd disconnect the Solid State transceiver =
>connection to the 30L-1 antenna relay.  Then turn the amp on.  What =
>happens?  If signals are there, then your SS transceiver amplifier =
>switch circuitry is not compatible and you'll need to come up with an =
>interface.=20
>
>If sigs are still not there when the SS transceiver is disconnected, =
>then something inside the 30L-1 is activating the relay and you'll have =
>to open it up and find out.  Since one side of the relay is connected to =
>the negative bias voltage, you'll have to find which component on the =
>other side of the relay is shorting out or leaking enough current to =
>ground to activate the relay coil.  Now I did experience something =
>similar once, and in that case I had some bad 811's that shorted out. I =
>replaced the 811's and it worked FB. =20
>
>Let us know what you find.
>73, Scott WA9WFA
>CCA98-762
>=20
>Sponsored by the Collins Collectors Association http://www.collinsradio.org
>Nets: Tues: 3.805 Mc-2000 Central / Thur: 3.875 Mc-2000 Central
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>
>

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Nets: Tues: 3.805 Mc-2000 Central / Thur: 3.875 Mc-2000 Central
Fri: 3.895 Mc-2000 Pacific / Sun: 14.263 Mc-2000 UTC
1st Wed (of the month) AM Net 3.880 Mc-2000 local (ET, CT, MT, PT)
Sun AM Net: 29.050 Mc-1200 Central






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