Troy
H&P stabilisation would hold your frequency to within a Hz or two for
the long term, thus minimizing even a slow drift after warm up. Hans
has come up with several minimalist stabilizer designs (a "One-Chip",
a "two-chip" and a minimalist version of the "Fast Stabilizer").
These circuits may be found on the <HUFFPUFFVFO.yahoogroups.com> forum.
Hans' stabilizer circuits may be made to lock onto 16, 32, or 64 Hz
tuning steps. The one and two chip designs use a 32.768 KHz watch
crystal (salvage one from a cheap watch purchased at the local dollar
store).driving a 74HC4060 binary counter for the timebase.
I have looked before at that receiver and counter on the web page you
suggested. Hans G0UPL's web page also has some minimalist counters that
could be adapted to your L.O. output, as does Onno PA2OHH
<www.qsl.net/pa2ohh/sfreq.htm> and Miguel PY2OHH
<>.
Arv
_._
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On Sun, 10 Apr 2005 16:53:53 -0000, kc8afu1965 <kc8afu1965@...> wrote:
Thanks Arv,
I've had the AFU callsign for about ten years and you're the first
person to comment on it. I thought it was funny when it was first
assigned to me but nobody seemed to share my sense of humor. Thanks
for noticing!
Thanks for the huff&puff invite. I've also been looknig at Hans
Summers website and I'm thinking about trying it out. My current CW
rcvr is the popcorn rcvr from the qrp homebuilder homepage. It has
an LO freq of approx 2.5 MHz (4.433 MHz IF)and is pretty stable ( I
think I remember about 2Hz per minute after warm-up but it's been a
while since I measured it so I could be wrong) but I am intrigued by
the H&P. Lately I have been finishing up a presettable frequency
counter that I can run directly off of my VFO. Now I know where I am
on the band. It can be found at:
It's at the bottom of the homepage.
Thanks for the invite and I will start checking out the H&P group.
73's & HPE CUL.
Troy
KC8AFU
--- In BITX20@..., "Arv Evans" <arvevans@e...> wrote:
Troy
The BITX has also been used for CW. Several builders have added
a
center-of-the-filter
BFO oscillator that serves both send and receive CW functions. I
took the
simple way and
just added a keyed AF oscillator that plugs into the mike jack.
Love the callsign. I'll bet you get a few comments about it
though!
I did not see your name in the members list for the Huff and Puff
group so
I will go
over there and send you an invite. The Huff & Puff VFO group
forum is a
logical
extension to the BITX because using an H & P circuit to stabilize
your
BITX oscillator
makes it into a very stable but still inexpensive rig that is
capable of
working with
narrow filters for CW and PSK/MSK contacts.
Arv K7HKL
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