[Tech-Assist] Convert Harris FM5K to SS IPA

[Alan Alsobrook]

On 3/25/2012 10:04 AM, Alan Kilgore wrote:
> Anyone got parts-list, schematic and instructions for converting a
> Harris FM5K to use a solid-state IPA?

I don't have any specific information, but in general, be sure your SS 
IPA has about 3db of headroom. After that I recommend that you use a 1/4 
wave stub in the connection to the PA. That provides for a better more 
stable 50 ohm match, as well as providing a DC path to ground should 
something happen in the PA tube.

After that most of the time it can be pretty much just be directly 
attached to the tube IPA feed point.

If you have a antenna analyzer it will make it much easier to set 
everything up prior to bringing up any juice. Just be sure to have the 
filaments warmed up when sweeping towards the PA.

-- 
Alan Alsobrook CSRE AMD
aalso at bellsouth.net