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ZS6RO > HARDWA 25.12.02 04:52l 28 Lines 766 Bytes #999 (0) @ WW
BID : 20902_ZS1RO
Read: DB0FHN DK5RAS GUEST
Subj: Converting Amplifier to 6M use
Path: DB0FHN<DB0ZWI<DB0HST<HB9OK<WB0TAX<SP7MGD<ZL2TZE<CT4DK<ON0BEL<CX2ACB<
LU1FES<KP4IG<ZS6RO<ZS6RO
Sent: 021222/1711Z @:ZS6RO.SRJ.GAU.ZAF.AF #:20902 [Johannesburg] InterGate
RO
** NEWSGROUP: alt.ham-radio.vhf-uhf,rec.radio.amateur.equipment
** FROM : "Keith Beckmann" <Kbeckmann.spankme@wi.rr.com>
I've got an old amplifier that I'd like to convert to 6 Meter use.
It's a sweep tube amp, with 3-6KD6's, in a grounded grid arrangement, with
an untuned input (.01 disc into Cathode, and an RF choke to ground) and a PI
network for output. The PI output circuit currently has about a 30pf
variable for tune, 6 turns #14 @ 1", and what looks like a 140pf variable
for load.
I cut the coil in half, and pumped 10 watts @ 50 MHz into it, but only got
10 watts output into my dummy load.
What am I doing wrong, besides trying to make a silk purse out of a sows
ear?
KB9WMJ
Keith
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