PA0KSB Drift Corrector
Back in 1977 there was a circuit published widely that claimed to
correct drift in a vfo by sampling the output, downconverting it, comparing it with a crystal oscillator then correcting a varicap in the vfo. Has anyone ever tried this? How well did it work? This circuit, if it works, could be resurrected and bring a lot of the older Boatanchor Rigs back on the air. It was called an FLL or Frequency Locked Loop and was not very complicated. Tony WA6LZH |
On 9 Oct 2003 16:58:37 -0700, Tony Angerame wrote:
Back in 1977 there was a circuit published widely that claimed to correct drift in a vfo by sampling the output, downconverting it, comparing it with a crystal oscillator then correcting a varicap in the vfo. Has anyone ever tried this? How well did it work? This circuit, if it works, could be resurrected and bring a lot of the older Boatanchor Rigs back on the air. It was called an FLL or Frequency Locked Loop and was not very complicated. Known colloquially as a "Huff and Puff" stabilizer of which PA0KSBs one is an improved version. There was a simplified version of PA0KSBs circuit published by G3DXZ, and a faster one by G7IXH. They were discussed at length in the Radio Society of Great Britains magazine "Radcom" in 1996 and 97, but that's probably not much help to you. I believe that G7IXHs version was published in QEX in 1998 if that helps. -- Cheers, Stan Barr stanb .at. dial .dot. pipex .dot. com (Remove any digits from the addresses when mailing me.) The future was never like this! |
On 9 Oct 2003 16:58:37 -0700, Tony Angerame wrote:
Back in 1977 there was a circuit published widely that claimed to correct drift in a vfo by sampling the output, downconverting it, comparing it with a crystal oscillator then correcting a varicap in the vfo. Has anyone ever tried this? How well did it work? This circuit, if it works, could be resurrected and bring a lot of the older Boatanchor Rigs back on the air. It was called an FLL or Frequency Locked Loop and was not very complicated. Known colloquially as a "Huff and Puff" stabilizer of which PA0KSBs one is an improved version. There was a simplified version of PA0KSBs circuit published by G3DXZ, and a faster one by G7IXH. They were discussed at length in the Radio Society of Great Britains magazine "Radcom" in 1996 and 97, but that's probably not much help to you. I believe that G7IXHs version was published in QEX in 1998 if that helps. -- Cheers, Stan Barr stanb .at. dial .dot. pipex .dot. com (Remove any digits from the addresses when mailing me.) The future was never like this! |
"Stan Barr" wrote Back in 1977 there was a circuit published widely that claimed to correct drift in a vfo by sampling the output, downconverting it, comparing it with a crystal oscillator then correcting a varicap in the vfo. Has anyone ever tried this? How well did it work? This circuit, if it works, could be resurrected and bring a lot of the older Boatanchor Rigs back on the air. It was called an FLL or Frequency Locked Loop and was not very complicated. Known colloquially as a "Huff and Puff" stabilizer of which PA0KSBs one is an improved version. There was a simplified version of PA0KSBs circuit published by G3DXZ, and a faster one by G7IXH. They were discussed at length in the Radio Society of Great Britains magazine "Radcom" in 1996 and 97, but that's probably not much help to you. I believe that G7IXHs version was published in QEX in 1998 if that helps. **** Hewlett Packard used this principle with the HP8708A Synchroniser which was used with the HP 606B and HP608F signal generators.It would lock them down to a very small frequency range. Brian Goldsmith. |
"Stan Barr" wrote Back in 1977 there was a circuit published widely that claimed to correct drift in a vfo by sampling the output, downconverting it, comparing it with a crystal oscillator then correcting a varicap in the vfo. Has anyone ever tried this? How well did it work? This circuit, if it works, could be resurrected and bring a lot of the older Boatanchor Rigs back on the air. It was called an FLL or Frequency Locked Loop and was not very complicated. Known colloquially as a "Huff and Puff" stabilizer of which PA0KSBs one is an improved version. There was a simplified version of PA0KSBs circuit published by G3DXZ, and a faster one by G7IXH. They were discussed at length in the Radio Society of Great Britains magazine "Radcom" in 1996 and 97, but that's probably not much help to you. I believe that G7IXHs version was published in QEX in 1998 if that helps. **** Hewlett Packard used this principle with the HP8708A Synchroniser which was used with the HP 606B and HP608F signal generators.It would lock them down to a very small frequency range. Brian Goldsmith. |
Known colloquially as a "Huff and Puff" stabilizer of which PA0KSBs one is an improved version. A nice web site on this is http://www.hanssummers.com/radio/huffpuff/contents.htm There are lots of downloadable papers there also. Sverre Asker, Norway www.qsl.net/LA3ZA |
Known colloquially as a "Huff and Puff" stabilizer of which PA0KSBs one is an improved version. A nice web site on this is http://www.hanssummers.com/radio/huffpuff/contents.htm There are lots of downloadable papers there also. Sverre Asker, Norway www.qsl.net/LA3ZA |
Thanks Stan, Brian and Sverre. I think I'll check out the URL for the
simplified and improved version. Good info. I guess if it's simple enough it's worth a try. I'll let you know if I do and what results. 73 Tony WA6LZH "Tony Angerame" wrote in message om... Back in 1977 there was a circuit published widely that claimed to correct drift in a vfo by sampling the output, downconverting it, comparing it with a crystal oscillator then correcting a varicap in the vfo. Has anyone ever tried this? How well did it work? This circuit, if it works, could be resurrected and bring a lot of the older Boatanchor Rigs back on the air. It was called an FLL or Frequency Locked Loop and was not very complicated. Tony WA6LZH |
Thanks Stan, Brian and Sverre. I think I'll check out the URL for the
simplified and improved version. Good info. I guess if it's simple enough it's worth a try. I'll let you know if I do and what results. 73 Tony WA6LZH "Tony Angerame" wrote in message om... Back in 1977 there was a circuit published widely that claimed to correct drift in a vfo by sampling the output, downconverting it, comparing it with a crystal oscillator then correcting a varicap in the vfo. Has anyone ever tried this? How well did it work? This circuit, if it works, could be resurrected and bring a lot of the older Boatanchor Rigs back on the air. It was called an FLL or Frequency Locked Loop and was not very complicated. Tony WA6LZH |
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