Message	Date	From	Subject
3800	2009-11-23 06:12:26	Tom	Bit-O-Bitx
Building on my last project (and video) of an SSB transmitter I used Diz's Radio Erector Set to turn it into a QRP SSB transceiver inspired by Ashhar Farhan's BitX20. I like to keep the modules that I use at 50 ohm input/output impedance so that I can freely swap them if I make a modification. So when Wes Hayward and Bob Kopski came up with a design for bidirectional amplifiers that maintains 50 ohm I/O impedance over the ham bands I figured it would perfect for my way of building. I'm not much for SSB but figured I would give it a go since it was something new. It has been fun. Once again, lacking the knowledge to design my own circuits, I took from the best: Ashhar Fahran's BitX20: http://www.phonestack.com/farhan/bitx.html W7ZOI and K3NHI: http://w7zoi.net/tech.html A Termination Insensitive Amplifier for Bidirectional Transceivers (With k3nhi) Dave Benson, K1SWL Mic amp and Power amp from 'A Single Board QRP SSB Transceiver for 20 or 75 Meters'April 1997 QST. Norcal QRP FCC-1/FCC-2 version 2 http://www.norcalqrp.org/fcc2.htm BPF from HFprojects http://www.hfprojectsyahoo.com/hfpa50wlpfi.html RF toolkits from W8DIZ http://www.partsandkits.com/ The video url is http://www.youtube.com/watch?v=V_uBqbEV0-w Tom, ak2b

Building on my last project (and video) of an SSB transmitter I used Diz's Radio Erector Set to turn it into a QRP SSB transceiver inspired by Ashhar Farhan's BitX20. I like to keep the modules that I use at 50 ohm input/output impedance so that I can freely swap them if I make a modification. So when Wes Hayward and Bob Kopski came up with a design for bidirectional amplifiers that maintains 50 ohm I/O impedance over the ham bands I figured it would perfect for my way of building. I'm not much for SSB but figured I would give it a go since it was something new. It has been fun.
Once again, lacking the knowledge to design my own circuits, I took from the best:
Ashhar Fahran's BitX20: http://www.phonestack.com/farhan/bitx.html
W7ZOI and K3NHI: http://w7zoi.net/tech.html A Termination Insensitive Amplifier for Bidirectional Transceivers (With k3nhi)
Dave Benson, K1SWL Mic amp and Power amp from 'A Single Board QRP SSB Transceiver for 20 or 75 Meters'April 1997 QST.
Norcal QRP FCC-1/FCC-2 version 2 http://www.norcalqrp.org/fcc2.htm
BPF from HFprojects http://www.hfprojectsyahoo.com/hfpa50wlpfi.html
RF toolkits from W8DIZ http://www.partsandkits.com/
The video url is http://www.youtube.com/watch?v=V_uBqbEV0-w

Tom, ak2b