[AMRadio] My BA Station: HQ-170 and Globe Champ 350

[Kim Elmore]

Thanks, Bud!

One item I made for the Champ is a 4:1 transmission line transformer so the rig always works into 200 ohms. It's not a balun, but a un-un out pf Sevick's book. I have resonant antennas for the CW portions but have a tuner for the rest, so the transformer will never see anything far from a 50 ohm load.

I did this because 50 ohms is the minimum the Champ's output tank can match and it won't go nearly that low on 160 m. This way, I can use a single feed line and never worry about running against the limit of the output network. I also made a 2:1 transformer, but that yields the minimum impedance for 160 m. I tested both and, while both work fine, the 4:1 puts me closer to the middle of the tank's range on all bands. Everything is certainly happy at 200 ohms.

73,

Kim N5OP



On Dec 11, 2011, at 11:05 PM, BUDW2GLN at aol.com wrote:

> GREAT   KIM....GREAT  GREAT....Congratulations,,,,,,,,,,,I'm  inspired to 
> get my Globe 350 up and running
> this winter...........Believe it or not I have 2 spare AMPREX 9909's (hen's 
> teeth :-)....)
> 
> Best 73
> 
> Bud W2GLN
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