We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissible in your locale.

Author Topic: EMTX  (Read 1484 times)

Offline QRP

  • Full Member
  • ***
  • Posts: 103
    • View Profile
EMTX
« on: October 24, 2021, 1327 UTC »
The EMTX: How to build an 8 component 40/30 meter QRP emergency transmitter

https://swling.com/blog/2021/01/the-emtx-how-to-build-an-8-component-40-30-meter-qrp-emergency-transmitter/

How to build a PC keyer and AM modulator for the EMTX emergency transmitter

https://swling.com/blog/2021/01/how-to-build-a-pc-keyer-and-am-modulator-for-the-emtx-emergency-transmitter/

//QRP

Offline QRP

  • Full Member
  • ***
  • Posts: 103
    • View Profile
Re: EMTX
« Reply #1 on: October 25, 2021, 0737 UTC »

Is it possible to replace 2SC2078 with an IRF510
or do these two work in different ways?

Offline Charlie_Dont_Surf

  • Hero Member
  • *****
  • Posts: 772
  • Charlie's Point, California
    • View Profile
Re: EMTX
« Reply #2 on: October 25, 2021, 2119 UTC »
The 2SC2078 is an NPN BJT. The IRF510 is an N-channel FET. They are not even close to the same thing.
I don't STRETCH the truth.

"Every minute I spend in this room, my signal gets weaker.
Every minute Charlie squats in the bush, his signal gets stronger."

Offline QRP

  • Full Member
  • ***
  • Posts: 103
    • View Profile
Re: EMTX
« Reply #3 on: October 27, 2021, 0749 UTC »
The 2SC2078 is an NPN BJT. The IRF510 is an N-channel FET. They are not even close to the same thing.

👍

 


Item image   IC Timer Cookbook byWalter G. Jung, Second edition

 $12.95