I7SWX mods & improvements

  

Stay tuned ...

...

... The radio technology is evolving.

From spark radio to superetherodyne then to SDR, Software Defined Radio, where some circuits are replaced by software applications;
first via direct conversion then to direct sampling of RF signals received to audio, using Analog Digital Converters (ADC) and more complex software programs.
This solution carry many benefits for the users.

SPARK img	ETHERODINE img	SDR img
SDR_P2	SDR_Hybrid	SDR_Hybrid p3

Recently, like what has happen for cars, we have manufacturers that have moved to hybrid technology, having an analog front end,
converting the RF signal to a classic Intermediate Frequency (IF), where an SDR is replacing the IF chain and converting the signal to audio.

This configuration is to benefit from the best performances of both worlds.
A strong mixer like the H-Mode Mixer, is required and a good performing ADC, with less stringent requirements, can be employed.

Some japanese manufacturers have selected an hybrid configuration for their new equipments.
Analog front-end with an H-Mode Mixer and a xtal roofing filter. Kenwood for TS990 and TS590 and Yaesu for FTdx10,
while for the FTdx101 a complex Dual Gate Mosfet mixer is implemented.

I would like to present informations and story about the H_Mode_Mixer, including some examples of upgrade
to old commercial HamRadio equipments.

• link to pdf 0)   my introduction to the 2THMM     24gen2022


• link to pdf 1)   - improved 2Transformer H-Mode-Mixer eng revA


• link to pdf 2)    2T H-MODE MIXER FSA3157 - FIN1002    -.-.-.


• link to pdf 3)   2T_H_Mode_Mixer with passive squarer    -.-.-.


• link to pdf 4)   2T H-MODE MIXER FOR NOISE BLANKING    updated gen2022


• link to pdf 5)   automatic SSB\FM\AM  Inrad roofing switch over for Yaesu FT1000MP   mar 2005


• link to pdf 6)   I7SWX FST3125 1T Mixer for Heathkit HW7 and others   rev nov 2018