[Central-Electronics] OK! -52db

[Jim candela]

Ron,

    Your 20A 2nd harmonic at -35 db down from the fundamental is surely not
world class, but consider it another way. 35 db down from 20 watts is about
6 mw, and 52 db down is about 100 uw. So how far on 80m is 6 mw (2nd
harmonic) going to be heard when feeding a 160 meter antenna? I might use
that tuner to get a better match to your antenna, and be able to inflate the
power from the 20A slightly into a different load impedance. The level of
that harmonic at -35 db is not a big cause of concern to me. That said, look
and see what happens on 15M when the mixer plate is detuned just a touch....

Regards,
Jim
JKO

-----Original Message-----
From: central-electronics-bounces at mailman.qth.net
[mailto:central-electronics-bounces at mailman.qth.net]On Behalf Of K3PID
Sent: Monday, March 12, 2007 6:30 PM
To: Central-Electronics at mailman.qth.net
Subject: [Central-Electronics] OK! -52db


OK! I added a small pie network tuner ( cap - inductor - cap ) and after
very carefuly adjusting the 20A as well as the tuner, I get the 20A-BC458 to
almost 20 watts ( OK 15 on 160 meters) and the second harmonic is down at 50
to 55 db below the carrier on 160 thru 20. Now this is all into a dummy load
and only on CW.  I am trying to establish the method I will use when it is
connected to the real antenna. Any hints?

Next - AM ( which should be a piece of cake ) and then SSB. I have already
established that the phase shift network is working very well.

More....

K3PID Ron H.

This email was scanned by
Norton Antivirus Corp. Edition
and found to be virus free!
_______________________________________________
Central-Electronics mailing list
Central-Electronics at mailman.qth.net
http://mailman.qth.net/mailman/listinfo/central-electronics
--
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.5.446 / Virus Database: 268.18.9/719 - Release Date: 3/12/2007
8:41 AM

--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.446 / Virus Database: 268.18.9/719 - Release Date: 3/12/2007
8:41 AM