[TMC] PAL-500

[J.F. Samuels - K2CIB]

Some antenna changeover relays have a set of external contacts which 
could be in series with the speaker (keep an 8 ohm resistor across the 
receiver output) or could short the receiver antenna input or could put 
the receiver in standby (if there is a connection for that).

*

*/73, John/*



*
On 11/2/2022 12:34 PM, Lawrence Godek wrote:
> I figured i needed to put the PAL-500 to some use on AM.  It's kind of 
> complicated but it works.  I use the K3 for a transmitter cause i can 
> vary the output power from nothing up to 100W.  So i go from the K3 
> into the "high" power input BNC connector on the back of the amp.  Out 
> of there into a T-R relay then to the input of my antenna tuner, out 
> of there to my wattmeter and thence to the antenna.
>
> the K3 is a transmitter only in this case.  With the output set to 5 W 
> i get over 100 out of the amp, maybe tubes a bit soft?
>
> For a receiver i use either the KX-3 or laptop using SDRplay coming 
> from the receiver side of the T-R relay.  Only bad thing about this  
> setup is that i don't have a means of muting the receiver so the only 
> isolation i have is from the T-R relay switching and that ain't doing 
> the job.
>
> To actuate the voltage to do the AMP power switching i come out of the 
> K3 KEY RCA port which controls an MFJ-704 remote relay type box Which 
> then controls the 24V used to key the AMP.   the 24V comes from an 
> external source.
>
> I am only using this on 40 AM at this time to get some bugs worked out 
> of the process.  First of which will be to get some sort of muting for 
> the laptop or KX3.  It's a bit awkward but at least it's got the amp 
> working and it's usefull again.
>
> Any thoughts or suggestions?
>
> Larry W0OGH
>
>
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