Ken,
I had never heard that and I don't see any reason for it unless the Pi
filter is designed improperly. I haven't checked the component values of
the Pi filter so I can't answer your question. Perhaps someone else here
can.
I'm not going to worry about that because I use openwire fed antennas here
and my Annecke symmetrical matchboxes do a pretty good job of adding
additional bandpass filtering. I haven't measured but I'll guess it to be at
least 15 to 20 dB. I also use Dunestar bandpass filters between my
transceiver and my amp so that assures the harmonics from the TX are already
at a very low level.
73
Rick
-----Original Message-----
On Behalf Of Ken Brown
Sent: Friday, March 04, 2005 2:40 PM
Subject: Re: [TenTec] OT: Heathkit HA14 measurements?
Hi all,
I have heard that the HA-14 is good at producing harmonics. Perhaps due
to using lower C in the Pi net to make it more compact. I have never
seen one up close, nor have I seen a schematic for one. Does it use the
same C and L values in the pi net as Heath's other pair of 572-B amps,
the SB-200/201? Or is there a big difference. It seems like it could be
a real neat compact amplifier to have, as long as it does not produce
QRM. Maybe it would be good in a BPL neighborhood.
DE N6KB
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