I4FAF HOMEBREW GALLERY
 HF TRX  - ham bands only HF TRX with gen.cov. RX   SRC Front-End  SRC01 Front-End
  with 28/144 MHz transvert      synthesized, 1 IF upconv.           pb filters simplified        pb  filters Butterworth, pream
      SRC02 Front-end

 SRC02 inside photos

  RX IF AGC high gain  
  Cauer pbf, preampl.,var att.  Butterworth and Cauer vers.  our try about W7AAZ design  

HF qrp Linear Ampli

    HF really Lin.Amplifi  
  with Mosfets vs. Transistors         with Tetrode Tubes  

 

I4FAF, Romano, has been awarded with this nice
   CERTIFICATE CLICK HERE
 issued by ARI  that states more than 50 years ARI membership
 (oltre 50 anni membro Associazione Radioamatori Italiani).

 

I4FAF home made laboratory instruments, useful  tools
for many amateur radio home brew projects entertainment. 
Our bench-work (CAUER FILTER on the bench for optimisation)
 Spectrum Analyser 1 to 600 MHz with tracking RF gen. (1996)
see note 4 under my article for project references in
 AMPL-DETECT LOG 80dB DINAMICA
Home built HF wattmeter, synthesized RF gen 4 to 520 MHz (1989)
 Two 1 to 50 Vdc, 5 Amp. regulated power supply (1996),
main regulator is from a QST article.