Hi, Bruce
Yes, I remember "The IMP - A 3 Tube Filter Rig" by Joe Galeski, W4IMP!
Wanted to build one, but by then I was designing and building my own rigs,
and home-brewing my own back-to-back double half-lattice crystal filters,
while working my way through college as a technician/junior engineer in a
radio plant. I built one crystal filter from 2105 KHz crystals that were
used as the 2nd L.O in a citizens-band transceiver that we manufactured.
They wre used to convert the 1650 KHz first IF to 455 KHz. I opened up the
HC-6 crystal cans and very carefully loaded and matched a couple of the 2105
crystal a bit lower in frequency wth with tiny bits of solder to pruduce an
SSB- width double 1/2 lattice filter that I built an SSB rig aound that I
used for a while with my NC-109 receiver.
Wow, home-brewing an HT-32 must have been quite a project!!
73,
Charlie, K4OTV
-----Original Message-----
From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of Bruce
Sent: Saturday, January 18, 2014 8:48 PM
To: Mike Waters; Charlie Cunningham
Cc: topband
Subject: Re: Topband: Nostalgic "openings"
There was a article in the June 1953 QST Page 47, that used a BC-457 as a
high level mixer into the 1625's to get on 40 meter SSB from 4 MHZ. On
Page 47 there is a diagram for the W2JJC SSB exciter using a half lattice
crystal network. A group picture at the bottom page 47 shows SSB operators
from all W call areas. Part of the caption "A stranger in the back of the
camera is explaining why he thinks s.s.b. isn't here to stay."
My first SSB transmitter was built from an article called "An Imp". only
remember making only one local contact with it. Then I found a schematic of
a Hallicrafters HT-32. I home built one but reversed the VFO and sideband
frequencies so I could use a McCoy 9 MHZ SSB filter. Could heterodyne 9 and
5 MHz to get 80 and 20 meters. Used another mixer to get other bands.
Lots of fun. The AM phone guys called us Donald Duckers... Lot of quack
quack noise.
73
Bruce
www.qsl.net/k1fz/beveragenotes.html
----- Original Message -----
From: "Mike Waters" <mikewate@gmail.com>
To: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Cc: "topband" <topband@contesting.com>
Sent: Saturday, January 18, 2014 7:09 PM
Subject: Re: Topband: Nostalgic "openings"
>I built EXACTLY the same thing when I was in high school (or maybe junior
> high) !
> I think the plans for that DSB arrangement were in an old CQ magazine.
>
> 73, Mike
> www.w0btu.com
>
> On Sat, Jan 18, 2014 at 2:41 PM, Charlie Cunningham <
> charlie-cunningham@nc.rr.com> wrote:
>
>> The first "sideband" rig I ever had -back in the 1950s was a T-19 (3-4
>> Mc)
>> ARC-5 in which I converted the 1625 finals to a high-level balanced
>> modulator by connecting the balanced grid tank to apply RF in push-pull
>> to
>> the control grids and applied push-pull audio transformer coupled to the
>> screen grids and left the plates in parallel.
>>
> _________________
> Topband Reflector Archives - http://www.contesting.com/_topband
>
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
|