> Date: Sat, 12 Jun 2010 07:03:51 EDT
> From: Gudguyham@aol.com
> Subject: Re: [Amps] Peter Dahl / Harbach SB-220 transformer
> :
>
>
>
>
> ## A buddy across town built a single 3-500z for 6m.. works good...
> abt
> 500w . He wiped out the neighbourhood
> CATV... and that amp was relegated to FD use. He also wiped out the 49.9
> mhz cordless phone freqs at the time. This
> was 10 yrs ago.
>
> ***** Well, if it only made 500 watts nothing was tuned right, there is
> still another 500 watts in there. Tune it right and you'll get the power
> in
> the right place not on cordless phones and CATV.
>
> #### That was a HB SINGLE 3-500Z 6m RF deck. The tube was
> semi flat.. and he had 100 w icon to drive it. 500w from a flat
> 3-500Z is not too bad.
>
> ## the amp was tuned correctly, LP filters, shorted 1/4 wave stubs et all.
> The problem is... you stuff 500 W into a 5 over 5 stacked array... and
> it's
> always gonna be pointed at one or more neighbours homes. Back then,
> those
> baby monitor's could be heard [across the street] on 49.990 mhz. I
> doubt those
> things will reject the low end of 6m. Ch-2 TV is another similar
> problem... none of em
> have HP filters in em... and bye-bye ch-2. Then toss in the 49 mhz
> cordless phone band.
> Do those things cut of 6m ??
>
> No wonder he wiped out the neighbourhood. I looked around my
> neighbourhood... and dumped
> the notion of installing the 9-el 6m yagi.[+ 2 kw] A buddy 1 mile away
> is up on a ledge/hilltop. At the
> time his icom had 6m. He installed an inverted vee on his flat roof...
> abt 10' above the roof.
> [and 400' ASL] ..with no balun.. and fed with 80' ofr RG-58. One
> afternoon... the 6m band was
> hopping. He had a 3 hr pile up into the east coast.. with lots of 60 over
> S-9 sigs in both directions.
> Then the band went dead. He stayed dead for months. His next rig did
> not have 6m .
> That was his 1st and last 6m experience.
>
> if I had more room.. 6m might be an option... but as is... I have no room
> for 10/12m.
>
> Later.... Jim VE7RF
Some years ago I had another ham call and tell me I was interfering with his
baby monitor and he was able to identify my call on CW. He was about 18
miles away. He wasnt upset, just very surprised. I was on 6M with 1200W
working Africa and beaming in his direction.
Carl
KM1H
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