>In a message dated 12/26/2003 11:53:08 AM Eastern Standard Time,
>n4dek@triad.rr.com writes:
>
>> Wondering if maybe someone that has access to the schematic for the
MLA-2500
>could take a look at it and let me know what I would need to change this
>amp to use vacuum relays. I've been told that I would need two relays but
>really don't know for sure. I've found several vacuum relays on ebay but
>need to be sure of what I need to get. One or two? Voltage? ect. I can't
>deal with the relay noise in this amp any longer.
>> Please help!
>
>You need two if you are using SPDT vacuum relays, one to switch the
>incoming RF from the transceiver to the input of the tubes
** This job can be performed by a Matsushita "RSD" RF reed relay. Bias
T/R switching can be done by an optoisolator and a NPN switch transistor.
>and one to
>switch the output from the amp to the antenna. The MLA-2500 uses an open
>frame DPDT relay to accomplish both of these functions.
>
>73........de Goose, W8AV
>_______________________________________________
>Amps mailing list
>Amps@contesting.com
>http://lists.contesting.com/mailman/listinfo/amps
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|