I7SWX HOME BUILDING

Dear Visitor, this WEB site is under construction. In the meantime I report the following information, hoping I will be able to produce, as soon as time will permit me, a more interesting and valuable content. The description about me is as the one I reported in the e-ham web site.

I have poorly opened my web site to permit visitors to get hold of the experiences collected by Takahiro Kato, JA9TTT/JH1WBU from Saitama, Japan, on the High Performance H-Mode Mixers as developed by G3SBI and improved by I7SWX. JA9TTT web is actually not reachable or closed. The information about Takahiro tests are extracted from his web site, written in Japanese and translated into English by translating software package. The translation is certainly not a “real English” one and not easy to read. The visitor that has technical knowledge should not have difficulties to understand and appreciate the functionalities of the H-Mode Mixer, in both his versions, and the very good work done by JA9TTT to test both of them with different transformers.

G3SBI work on the H-Mode Mixer (3 transformers) can be found on RadCom magazines, the Radio Society of Great Britain publication, in English, while in Italian on RadioRivista, the magazine of the Associazione Radioamatori Italiani, both the work of G3SBI and I7SWX. A brief report is also on the latest book of W7ZOI.

The first application of the H-Mode Mixer on a project is the one of the transceiver CDG2000; as modification, on a commercial equipment, by me on my Icom IC751 replacing the original third mixer (9MHz to 455kHz) in both versions, G3SBI and I7SWX. The first application of the I7SWX 2T-H-Mode Mixer version is in the “Pic-A-Star”  a software transmitter and receiver project by Peter Rhodes, G3XJP, published in RadCom from August 2002 expected ending March 2004. See below references:

JA9TTT I7SWX TWO BALUNS H-MODE DBM WITH FST3125M

JA9TTT - 3T High performance H-MODE mixer (with 3 baluns) The Cheap way

JA9TTT has now a new web page. You can visit the
following. It is in Japanese but it match the
automatic translation reported here. You can look at
the Spectrum analyzer pictures. You can also check the
test on the G3SBI 3T H-Mode Mixer.
http://ja9ttt.homedns.org/hamf/myexp/2T-H-Mode-DBM.html

Colin Horrabin, G3SBI “G3SBI’s High Performance Mixer” - G3VA, Technical Topics – RadCom October 1993

Giancarlo Moda, I7SWX “High Level Mixers” - G3VA, Technical Topics – RadCom - July 1998

Bill Carver, W7AAZ “H-Mode Mixer with FST3125” - G3VA, Technical Topics – RadCom -Aug. 1998

Colin Horrabin, G3SBI “G3SBI’s H-Mode FST3125 Mixer – Constructional Details” - G3VA, Technical  Topics – RadCom - September 1998

Giancarlo Moda, F-I7SWX                “Nuovi Mixer ad elevata Dinamica” – Radio Rivista 3/99

Giancarlo Moda, I7SWX-F5VGU   “Modifiche al ricevitore dell’IC751 per migliorarne l’IP3” –

Radio Rivista 4/02

Giancarlo Moda, I7SWX-F5VGU “I7SWX two-transformer H-Mode Mixer” – G3VA, Technical Topics – RadCom (RSGB – UK) April 2003

Giancarlo Moda, I7SWX-F5VGU “I7SWX improved two-transformer H-Mode Mixer” – Radio Rivista, November 2003.

Giancarlo Moda, I7SWX-F5VGU                “Applicazione dell’H-Mode Mixer I7SWX sulla Terza

Conversione dell’IC751” – Radio Rivista – expected January 2004.

G3SBI, G8KBB, G3OGQ “The CDG2000 HF Transceiver by Colin Horrabin, G3SBI, Dave Roberts, G8KBB, George Fare, G3OGQ” – RadCom - June-December 2002.

G3SBI, G8KBB, G3OGQ “The CDG2000 HF Transceiver”- http://www.warc.org.uk/cdg2000

Wes Hayward, W7ZOI, et al                “Experimental Methods in RF Design” – ARRL – 2003

Peter Rhodes, G3XJP                    “Pic-A-Star. Software Transmitter and Receiver”  Part 16, RadCom

November 2003.