Author: Damien F4AZF via Topband <topband@contesting.com>
Date: Sat, 19 Apr 2014 16:48:18 +0200
Hello ? I m looking for people who has ever done mods on fl2100z power amps because on 160m I can reach 450-480w max. On other bands example 80 or 40 it can reach 700w without problems. I have Ever m
I think we must do something on the anode coil for better Q or add some length, change diameter?.. or other things ..?! The only real tank circuit issue is range of the tank components used to adjust
Hi Tom, I have ever also have a look few times on your website and infos about the fl2100, some mods have been also done before I get the PA. "Load" button on 160m is always at "0" "ccw" even on 1810
Hi Bill , thanks for reply On schematic i can observ that on 160m Loading capa is done so : by 3 * 500pf Variable in // "VC2" (the Load button)520pF variable + c31 32 33 34 500pF 3kV in // So 3500pF
Is the input circuit properly matched? Herb Schenbohm, KV4FZ I think we must do something on the anode coil for better Q or add some length, change diameter?.. or other things ..?! The only real tank
If he gives the plate current and grid current compared to other bands, it will answer all questions all at one time. :) Is the input circuit properly matched? Herb Schenbohm, KV4FZ I think we must d
I owned a FT2100Z for several years and the power on 160m was the same as other bands. I don't expect any design flaw. The original tubes are not available anymore, the 572's tubes manufactures nowad
Damien, "Load" button on 160m is always at "0" "ccw" even on 1810khz or 1900khz, just the "plate" get some influence "1" in CW part and "3" at 1850 for This indicates not enough loading capacitance o
A proper tank would be about 300-330 pF on the tune side (allowing for plate choke reactance) and 2000 pF on the load. This requires 33 uH on the total inductance. Yaesu has way too little tank induc
Hi Tom, Thanks for the detailed infos/conclusions with my remarks/measurements. So i ll do some mods during the week , 1st add some capacitance on the Load in // to c32 en cie... I ll begin with 470p
So i ll do some mods during the week , 1st add some capacitance on the Load in // to c32 en cie... I ll begin with 470p more and do the test and increase... Once ok I ll add some inductance on the 16
Hi ,so some news after some tests : I have add 1000pF on the load capacity: Can nearly 550w .. so it was missing some ! Today I have add 5 more turns on the Load tank coil..(14 original + rest of oth