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Good Job guys!
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Hello all,
I just wanted to say what a fine group I think this is. I have not built a BITX (I do mostly CW homebrew projects) but most of the topics here have been pertinet to my homebrewing. My only regret is that I didn't join when the group was started (I've only been tuning in for the last two months). This group gets my approval as the best homebrewing group on the web. Keep up the good work guys! Troy Hunt KC8AFU. |
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Arv Evans
Troy
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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 On Fri, 08 Apr 2005 17:23:14 -0000, kc8afu1965 <kc8afu1965@...> wrote:
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Expore all the Ideas...Exploit the good ones! |
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Now you have the benefit to read for example every day ten (for you
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new) postings! Often it is better to follow also what happened before, preventing that the same questions are asked more often. Hear you on the band ;-) Chris, PA3CRX My only regret is that I |
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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: Troya center-of-the-filtertook the simple way andthough! group so I will goforum is a logicalyour BITX oscillatorcapable of working with |
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Arv Evans
Troy
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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 _._ On Sun, 10 Apr 2005 16:53:53 -0000, kc8afu1965 <kc8afu1965@...> wrote:
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Expore all the Ideas...Exploit the good ones! |
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Ron
Dear Troy,
Would like to inform you that I included the Huff&Puff circuit into my BITX17 (converted BITX20 for 18.068...18.168 MHz). In my Photobox (PA2RF) you can see 2 pictures of the VFO performance made with MixW.2.10. (witout and with Huff&Puff). The results were (and still are) amazing! I can easily decode PSK31, RTTY and other digimodes now. Bye from Holland Ron PA2RF --- In BITX20@..., "kc8afu1965" <kc8afu1965@y...> wrote: CW rcvr is the popcorn rcvr from the qrp homebuilder homepage. It hasI think I remember about 2Hz per minute after warm-up but it's been aby the H&P. Lately I have been finishing up a presettable frequencyam on the band. It can be found at: |
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Mike W
Impressive Ron, Not a criticism, but I note some products of the VFO
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some distance from the carrier in the unlocked pic which are not noticable when the HuffPuff is operative due to the other noises. I guess you must live in a noisy enviroment. thanks for the pics though. atb Mike W, G8NXD -- On 11 Apr 2005 at 7:26, Ron wrote:
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Ron
Tnx for your reply dear Mike,
I did the measurement with a Philips low-budget "world" receiver (with BFO :-) ) connected to a Celeron 266 MHz PC using MixW2.10 and I suspect this radio causing most of the anomalies you indicated. And yes, I live in a pretty EM-noisy environment (GSM, wifi antennas and lot of building activities like cranes with 70cm devices in the vicinity). 73 Ron PA2RF --- In BITX20@..., "Mike W" <mike@c...> wrote: Impressive Ron, Not a criticism, but I note some products of theVFO some distance from the carrier in the unlocked pic which are not> stable but still inexpensive rig that is > capable of > > working K7HKLwith > > narrow filters for CW and PSK/MSK contacts. > > > > Arv
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Hans Summers
Guys
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I am planning a Huff Puff VFO kit for my 2-chip minimalist VFO see . I am sure that this would be suitable for use with BITX transceivers. I have just posted a message to the Huff Puff forum about what possible features to include in the kit. Hoping to keep the cost as absolutely minimal as possible! 73 Hans G0UPL -----Original Message-----
From: Arv Evans [mailto:arvevans@...] Sent: 10 April 2005 18:52 To: BITX20@... Subject: Re: [BITX20] Re: Good Job guys! 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 _._ On Sun, 10 Apr 2005 16:53:53 -0000, kc8afu1965 <kc8afu1965@...> wrote:
-- Expore all the Ideas...Exploit the good ones! Yahoo! Groups Links |
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