[VHFcontesting] Icom AG-25 mast mount preamp

[Ray J]

You dont have any lightning protection hooked to your coax where it 
would ground out the dc for the preamp do ya

Have you tried it in the shack,? do you hear the relays switching?

Is there any change in the noise level/s-meter when turning the preamp 
on and off in the radio menu/switch.

have you verified there is dc out of the radio coax while in receive 
mode while the preamp is switched on?

More than likely relays are pushed to their limit at 100 watts.. also 
they might not have enough isolation over 100 watts, leaking too much 
signal to the active device.

w9Ray

Jon Casamajor wrote:
> I bought a new  AG-25 preamp over a year ago and it never worked. I enabled
> it in my IC-910H but it never worked on the tower, although it did work on
> the bench.
> 
> I may have killed it with something over 100w but before I put an amp on
> line, it still didn't work. I am refreshing my tower to be ready for the
> June bash and have it here on my bench.took it apart and see nothing at all
> burned up inside. Question is, what is likely to fail if it is hit with more
> than the 100 watt limit?
> 
> I know it's better than any other preamp in the shack but I can't measure
> how much if it isn't working. BTW, the 432 preamp on the same tower, feeding
> the same radio works super but it's never had more than 65W through it. it
> is also rated at 100w.
> 
> What would hooking up the preamp backwards do to it?  
> 
> Taking it apart, killed the purge but at least when I seal it up, our
> humidity will be pretty low.33% now.  
> 
> The AG-25 is a really clunky design with the hard to reach, SO239
> connectors. It's almost impossible to attach coax when mounted. Tiny
> Japanese hands I guess.Clunky design
> 
>  
> 
> Cheers,
> 
>  
> 
>  73, Jon
> 
>  K6EL
> 
>  
> 
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