Agree in principle..QSK on 6M not that important
Dave
NR1DX
On 6/5/2020 11:30 PM, Jim wrote:
Good article except for tearing out the original relay. Not necessary,
unless you want to use QSK or hate the sound of loud relays (like I do).
Thanks
73
Jim W7RY
On 6/5/2020 10:24 PM, Adrian wrote:
Have you seen this one Steve ?� ;
http://www.arrl.org/files/file/Technology/QST_Apr_2008_p38-40.pdf
On 6/6/20 1:10 pm, Artek Manuals wrote:
I have enough HF amps here (four at last count) One of them is an
ancient SB-220 , so I thought what the heck I would "hack" it and
turn it into a 6M single band. I have a folder� full of articles on
how to from the last 20 + years.
All done "physically" but try as I may I can not get more than about
600w out .
1) Two different tank circuits , one with a section of the original
10/15� coil from the SB220 and a 2nd one with a a piece of flat
copper strap ...no difference
2) Changed the parasitic chokes
3) Tried� "T" input match. Pi input match , straight through ...no
difference
4) Plate voltage is 2400 unloaded and about 2050 loaded in CW position
5) Bias measures 6V
7) Has new Hardbach bias and diode and metering board
8) Older set of Eimac 3-500Z and newer set RF Parts 3-300ZG ...no
difference
What am I missing, ?
What else to try?
Dave
NR1DX
manuals@artekmanuals.com
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www.ArtekManuals.com
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