Huff & Puff Reference Library

The following is a complete list of all articles I have managed to find relating to the Huff-Puff method of stabilising a VFO for use in amateur radio transmitters and receivers. These documents are in Adobe Acrobat (PDF) format. If you do not have Adobe Acrobat installed, you can install it here. If anyone has an article not in my collection, please email it to me!

IMPORTANT NOTE: I have tried to keep the file sizes as small as possible. You will need to experiment with the viewing scale in Adobe Acrobat to obtain the most readable image. Often using the "Actual Size" setting, equivalent to 100% zoom, is best. Printing the files is another alternative, which should always produce good-looking pages.

Thanks to the Radio Society of Great Britain (RSGB) for permission to reproduce articles from Radcom, the society's monthly journal.

Thanks to the American Radio Relay League (ARRL) for permission to reproduce articles from QEX, the Forum for Communications Experimenters.

Permission to reproduce the articles from Elektor Electronics was unfortunately NOT GRANTED. If you require any further information on these articles, please email me direct. Fortunately you can also read about Eamon Skelton's EI9GQ's VFO stabiliser project on his website, complete with downloadable PIC assembly code. Ham Radio magasine is no longer in print. I made some effort to try to track down the owner of the Ham Radio copyright, which I believe to be QST (ARRL), however to date I have not received a reply.

Thanks to David White W5NY for sending me the following articles: Ham Radio, Nov '74 "Tuned VLF Converter"; Ham Radio, Jun '79 "AFC Circuit for VFO's"; Ham Radio '87 "Better frequency stability for the Drake TR7". The article titled "Tuned VLF Converter" does not relate to Huff & Puff stabilisers; it is included here because it uses a variable magnetic field to tune a VFO inductor, as David W5NY and I have done in our Huff & Puff stabilisers.

Many of the articles come from Pat Hawker's excellent "Technical Topics" column from RadCom. Pat has been writing this column every month since 1958. These articles are marked with publication "RadCom TT" in the list below. All of these articles are written by Pat himself, but make frequent reference to diagrams and letters he has received. In these cases I have listed the original source as the author, not Pat. To keep the file sizes as small as possible, I have edited out surrounding articles (interesting though they often are).

Publication	Issue	Author	Size	Article
RadCom TT	Jul 1973	Klaas Spaargaren PA0KSB	185K	Crystal-stabilized VFO
RadCom TT	Oct 1973	Joe Cropper G3BY	126K	The Huff and Puff VFO
RadCom TT	Nov 1973	Harry Burton ZL2APC	48K	Origins of the Huff and Puff VFO
RadCom TT	Nov 1973	John Compton G4COM	162K	More views on huff & puff VFO's
RadCom TT	Dec 1973	Various	205K	Huff & Puff comments
RadCom TT	Mar 1974	J H Tait BRS32041	76K	Huff and puff VFO stabilization
RadCom TT	Mar 1974	A K Forrest BRS34402	117K	A versatile Huff & Puff system
RadCom TT	May 1974	P A Howarth G3YAC	66K	Huff and Puff stabilizer correction
RadCom TT	Jul 1974	Joe Cropper G3BY	209K	Huff and Puff postscript
RadCom TT	Aug 1974	PA0AGE	151K	PA0AGE Huff and Puff
Ham Radio	Nov 1974	Unknown	540K	Tuned VLF converter
Ham Radio	Dec 1977	Klaas Spaargaren PA0KSB	293K	Drift-correction circuit for free-running oscillators
RadCom TT	Apr 1978	Klaas Spaargaren PA0KSB	256K	Huff and Puff in CMOS
RadCom	Aug 1978	T Winter G4AOK	566K	Huff and Puff stabilizer
Ham Radio	Aug 1978	Crawford MacKeand WA3ZKZ	1743K	Frequency-lock loop pages 1-3 and pages 3-6
Ham Radio	Jun 1979	Read C Easton K6EHV	332K	AFC Circuit for VFO's
Elektor	May 1980	Eamon Skelton EI9GQ		REMOVED: Frequency Lock System.
Ham Radio	Aug 1987	Urs Hadorn HB9ABO	871K	Better frequency stability for the Drake TR7
SPRAT 63	Summer 1990	Stef Niewiadomski	197K	The Huff & Puff revisited
RadCom	Mar 1991	Klaas Spaargaren PA0KSB	653K	The Fifth-Method Stabilised Oscillator
QEX	Feb 1996	Klaas Spaargaren PA0KSB	819K	Frequency Stabilization of L-C Oscillators
RadCom TT	Jul 1996	Klaas Spaargaren PA0KSB	140K	Improved 'Huff and Puff' Stabiliser
RadCom TT	Sep 1996	Charles Fletcher G3DXZ	117K	Huff & Puff in practice
RadCom TT	Dec 1996	Klaas Spaargaren PA0KSB	83K	Huff & Puff - PA0KSB comments
RadCom TT	Feb 1997	Peter Lawton G7IXH	89K	Huff & Puff Oscillator
RadCom	Dec 1997	Chas Fletcher G3DXZ	477K	Stay-Put: The Improved Huff & Puff VFO
RadCom TT	Dec 1997	Peter Lawton G7IXH	139K	The 'Fast' Huff & Puff Stabiliser
RadCom TT	Feb 1998	Klaas Spaargaren PA0KSB	396K	PA0KSB endorses 'Fast' Huff & Puff
Elektor	Feb 1998	Eamon Skelton EI9GQ		REMOVED: Frequency display and VFO Stabiliser
QEX	Nov 1998	Peter Lawton G7IXH	628K	The 'Fast' Digital Oscillator Stabilizer. Hi-res Fig.5
RadCom TT	Dec 1999	Pat Hawker G3VA	420K	Farewell Pa0KSB, Silent Key
RadCom TT	Jun 2000	Peter Lawton G7IXH	105K	G7IXH's Fast Huff & Puff Stabiliser
RadCom TT	Sep 2000	Chas Fletcher G3DXZ	108K	Slow-tuning Fast Stabiliser
SPRAT 122	Spring 2005	Hans Summers G0UPL	103K	Simple Huff & Puff VFO Stabilisers
SPRAT 122	Spring 2005	John Beech G8SEQ	165K	Huff & Puff revisited again!
SPRAT 123	Summer 2005	Hans Summers G0UPL	69K	Simple "fast" Huff & Puff VFO Stabilisers
RadCom TT	Sep 2005	Hans Summers G0UPL	59K	Low-cost Huff & Puff stabilised VFO
RadCom TT	Feb 2007	Ron Taylor G4GXO	345K	Fast 'Huff & Puff' stabiliser in a PIC
RadCom TT	Jun 2007	Chas Fletcher G3DXZ	154K	An Alternative PIC stabiliser