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[Amps] low pass filter fail ;)

To: Amps <>
Subject: [Amps] low pass filter fail ;)
From: Benedikt Sveinsson <>
Date: Fri, 25 Apr 2014 21:49:47 +0000
List-post: <">>
I have been building a 2M SSPA - final part in the puzzle has been the low pass 

After building this filter, copied the design from W6PQL - but I have limited 
resources here in TF land, so I don't have access to good PCB materials. But 
the filter was measured using a mini VNA Pro analyser with good results.  1:1.2 
SWR on the operating frequency and cuttoff starts around 150Mhz

well, after transmitting about 10s I noticed a drop in output power, I took the 
cover off and aimed the camera while transmitting

This is what happened on youtube:

I suspect there is something else wrong, as this happened very fast 10-15s - 
and solder melts!

Guess I will go and find teflon sheets and make my own capacitors with copper ;)

73, Benni TF3CY
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