Site is Loading, Please wait...
Skip to content
S21RC Shack
  • Home
  • Ham Radio
  • Ham Radio Awards
  • DIY
  • Adventure
  • Privacy Policy
  • Cookie Policy
  • Toggle website search
Menu Close
  • Home
  • Ham Radio
  • Ham Radio Awards
  • DIY
  • Adventure
  • Privacy Policy
  • Cookie Policy
  • Toggle website search

amateur radio

  1. Home>
  2. Home>
  3. amateur radio
Read more about the article Finding impedance and velocity factor  of an unknown Coaxial cable using nanoVNA

Finding impedance and velocity factor of an unknown Coaxial cable using nanoVNA

  • Post author:s21rc
  • Post published:August 21, 2024
  • Post category:Ham Radio
  • Post comments:0 Comments

I needed some 75ohm cable to make impedance transformer harness for my VHF/UHF cross yagi setup. Found a 20m roll of RG179 which was procured from China long ago. I…

Continue ReadingFinding impedance and velocity factor of an unknown Coaxial cable using nanoVNA
Read more about the article RF Sampler

RF Sampler

  • Post author:s21rc
  • Post published:July 27, 2024
  • Post category:DIY/Ham Radio
  • Post comments:0 Comments

A DIY RF sampler with -50db sampling out, most beneficial for measuring the output of HF radio PA section using Spectrum Analyzer. Also can be used for Pure Signal transmission.

Continue ReadingRF Sampler
Read more about the article K9AY Receive loop antenna

K9AY Receive loop antenna

  • Post author:s21rc
  • Post published:July 16, 2024
  • Post category:DIY/Ham Radio
  • Post comments:0 Comments

In 2022 I made one 200m long beverage antenna for our IOTA (S21DX, 2022) which was around 2m high from ground. For some reason (most probably very high conductive wet…

Continue ReadingK9AY Receive loop antenna
Read more about the article 5 Band LPF for HF Amplifier (up to 200W)

5 Band LPF for HF Amplifier (up to 200W)

  • Post author:s21rc
  • Post published:May 27, 2024
  • Post category:DIY/Ham Radio
  • Post comments:0 Comments

As many wish to make the cheap PA-70, PA-100 type Chinese SSPA using IRF530 based MOSFET. I always advise them to never operate a SSPA without final LPF. We do…

Continue Reading5 Band LPF for HF Amplifier (up to 200W)
Read more about the article Homebrew 3 elements 10m Yagi antenna

Homebrew 3 elements 10m Yagi antenna

  • Post author:s21rc
  • Post published:March 9, 2024
  • Post category:DIY/Ham Radio
  • Post comments:1 Comment

When S21DW heard that I am planning to make an 3 elements short beam for 10m to replace my 2 elements 10m antenna he immediately jumped to make it asap.…

Continue ReadingHomebrew 3 elements 10m Yagi antenna
Read more about the article SSPA Controller V2.1.x LITE

SSPA Controller V2.1.x LITE

  • Post author:s21rc
  • Post published:November 27, 2023
  • Post category:DIY/Ham Radio
  • Post comments:13 Comments

Update Log: 7 Jul 2024: 2.1.14 Lite released. Bug fix for PEP hold, and gradual decay added for watt graph.14 March 2024: 2.1.13 Lite released, Exponentially Weighted Moving Average used…

Continue ReadingSSPA Controller V2.1.x LITE
Read more about the article S21RC Digital Interface Rev 2.0 (Ham Radio – Computer)

S21RC Digital Interface Rev 2.0 (Ham Radio – Computer)

  • Post author:s21rc
  • Post published:May 23, 2023
  • Post category:DIY/Ham Radio
  • Post comments:0 Comments

Too many of us just connect the audio from the computer to the radio without realizing why the audio has distortion or why the computer is acting. So if you…

Continue ReadingS21RC Digital Interface Rev 2.0 (Ham Radio – Computer)
  • 1
  • 2
  • Go to the next page

Projects

  • RF Sampler
  • K9AY Receive loop antenna
  • 5 Band LPF for HF Amplifier (up to 200W)
  • Homebrew 3 elements 10m Yagi antenna
  • S21RC Digital Interface Rev 3.0 (Ham Radio – Computer)
  • SSPA Controller V2.1.x LITE
  • S21RC Digital Interface Rev 2.0 (Ham Radio – Computer)
  • S21RC SSPA Controller Hardware Rev 3.x
  • S21RC LDMOS SSPA Controller V2.0
  • Dead ICOM IC-7000 radio, Click Click from the relay

Recent Comments

  1. Vlad W6BVB on S21RC SSPA Controller Hardware Rev 3.x
  2. Sadi on Homebrew 3 elements 10m Yagi antenna
  3. Wayne on S21RC SSPA Controller Hardware Rev 3.x
  4. Rabby on S21RC SSPA Controller Hardware Rev 3.x
  5. Wayne on S21RC SSPA Controller Hardware Rev 3.x

About Me

About Me

Fazlay Rabby

Adventure enthusiast and Ham Radio Operator.
  • Opens in a new tab

My Ham Shack

  • Finding impedance and velocity factor  of an unknown Coaxial cable using nanoVNA
    Finding impedance and velocity factor of an unknown Coaxial cable using nanoVNA
    August 21, 2024/
    0 Comments
  • RF Sampler
    RF Sampler
    July 27, 2024/
    0 Comments
  • K9AY Receive loop antenna
    K9AY Receive loop antenna
    July 16, 2024/
    0 Comments
  • 5 Band LPF for HF Amplifier (up to 200W)
    5 Band LPF for HF Amplifier (up to 200W)
    May 27, 2024/
    0 Comments
  • Homebrew 3 elements 10m Yagi antenna
    Homebrew 3 elements 10m Yagi antenna
    March 9, 2024/
    1 Comment
May 2025
M T W T F S S
 1234
567891011
12131415161718
19202122232425
262728293031  
« Aug    
  • Home
  • Ham Radio
  • Ham Radio Awards
  • DIY
  • Adventure
  • Privacy Policy
  • Cookie Policy
Copyright - WordPress Theme by OceanWP