Nope, not one Q..Was going to Randy, AA6WJ's again, but was told that we
had company coming. At 0100Z (start time), heard that company not
coming.
I looked at my bent tower and got depressed since the next day it would
be sold and there would just be a bare concrete patio left. (8 ft deep
with 3 picnic table mounting bolts)
Also, my friend Carl AH8I was in town selling all his radio gear and
getting ready to emigrate, permanently, to KH8. I picked up his
Ten - Tec Hercules 12V 700W Solid state AMP, the matching antenna tuner
and a 60A Astron metered supply.
Guess I'll needa Diehard for voice (yuchhh) and cw peaks.
New tower will be here in time for super hot wx and SS. Still debating
rotator choice.
Carl sez he'll buy new radios when he gets the yen. (Get it?)
Eric, NV6O
edwoods@pacbell.com
>From jholly@hposl62.cup.hp.com (Jim Hollenback) Thu Jul 27 17:00:15 1995
From: jholly@hposl62.cup.hp.com (Jim Hollenback) (Jim Hollenback)
Subject: EWE xfmr problem discovered
Message-ID: <9507270900.ZM22674@hpwsmjh1.cup.hp.com>
Thanks to N5WA, WB4iUX, K0SF, NF6S, K2WK, and N4OO.
Steve, K0SF, suggested that there was not enough inductance on the
windings. Walt, K2WK, gave some design info and suggested the XL of
the windings be at least 4 times the matching impedance. I later
found a referrence in the ARRL Design Handbook about designing toroid
transformer and they suggested 5 times.
Well, to make a long story short, I ordered FT-82-75 from Amidon.
Foolishly I assumed that is what I had. Last night I stripped one of
the cores and wrapped five turns and measured the inductance. Oops,
less than a microhenry. After some key punching on the trusty HP-15
I come up with the answer I really have a FT-82-63/67 core. The ON4UN
design uses a mu of 5000, I had a mu of 40. I had a FT-50-75 core so
I tried five turns on that, and the answer was 11+ microhenries, which
is what the HP-15 said it should be for type 75 material. With this mix
the five turns will give a XL of around 250-270 ohms at 3.55 MHZ, which
is comfortably in the range suggested by Walt and the ARRL book.
I might mention the design Arlan, N4OO, suggested. He wraps about 16
turns or so on the core and then taps at about 4 turns. He also uses
telephone hookup wire. Sounds interesting, I'll have to check it out.
Thanks all!
I need to talk to Amidon this morning and see about replacing the cores.
73, Jim, WA6SDM
jholly@cup.hp.com
>From David McGee" <david_mcgee@maca.sarnoff.com Thu Jul 27 13:21:55 1995
From: David McGee" <david_mcgee@maca.sarnoff.com (David McGee)
Subject: PED411 vs. RUFZ
Message-ID: <n1405274650.31592@maca.sarnoff.com>
A very nifty CT-like contest CW trainer for the pc is available at
oak.oakland.edu in SimTel\msdos\hamradio called PED411i.zip. The program
simulates the CT screen and sends contest exchanges while keeping track of
your rate and score like CT. You can send to the program using the keyboard
or by attaching a paddle to the parallel port. It also supports SoundBlaster
audio for very realistic pileups of up to 18 (!) stations calling at once
(without a sound card it uses the internal pc speaker but with only one
station calling at a time). The "orderliness" of the pileups can be set from
normal to chaotic, which determines how many calling stations stand by while
you make your QSO. The program also has an RIT control to "tune in" the
calling stations. A nice package which we have found to be more fun and more
realistic than RUFZ.
73, Dave N3AHF
>From mraz@maverick.aud.alcatel.com (Kris I. Mraz) Thu Jul 27 19:11:21 1995
From: mraz@maverick.aud.alcatel.com (Kris I. Mraz) (Kris I. Mraz)
Subject: PED411 vs. RUFZ
Message-ID: <9507271811.AA20229@maverick.aud.alcatel.com>
What I need is a spint/sprINT trainer to get warmed up BEFORE the contest
starts. Like many others, I don't get into the rhythm until well into the
contest.
73
Kris AA5UO
mraz@aud.alcatel.com
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