Subject: glowbugs V1 #230
glowbugs Sunday, January 25 1998 Volume 01 : Number 230
Date: Sat, 24 Jan 1998 15:57:21 -0500 (EST)
From: lee1@digital.net
Subject: selectoject
Hi Gang
I might have mentione that I was having much
difficulty getting the selectoject which is a tunable,
audio amp,to be used when copying cw working.
Well I finally found all my wiring errors and
today I fired it up and low and behold it worked.
It will give you at least 10 db gain on the freq
selected which works very good to help[
seperate cw sigs.
Now my question, the schematic calls for a
5 meg dual pot which serves as a tuning or
freq adjust contreol. This was hard to find in
fact I had to send away for it.
However the tuning control is very touchy
and actually the pot is not used as a pot but
as a reostate
that is one end is not connected. Measuring
the resistance At the point where it amplified
a nice 700-1000 cy note , I found I was only using
78k of the 5 megs. Do you think the author
meant .5meg which would seem much more likley.
This schematic is to be found in most
any rad am hdnbk from th 50's to the late 60's
I have replaced the 5 meg jobberdo with a dual
1meg and the freq adjust is much better.
Maybe some of you engineer types could look
over this schematic and let me know what you think. 73 73 73
Thank the good LORD for all that you have!!!
67yr old semi disabled senior trying to get code speed to 13wpm
(stroke got my eyesight, balance & coordination) SO ONLY BA'S NO SOLID STATE
Leon (lee) Wiltsey 4600 Lake Haven blvd Sebring fl. 33872 KF4RCL TECK+
Date: Sun, 25 Jan 98 15:13:35 PST
From: "C-W Crystals" <cwxtal@u-n-i.net>
Subject: SOFTWARE DOR XTAL FILTER'S
Hi gang,
Some time back I saw a message posted on one of the "list's" reference
somewhere a software program was available for modeling or designing
CRYSTAL FILTERS.
Does anyone have this information, or can anyone tell me of any "programs"
that are available?
73 John
End of glowbugs V1 #230
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