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The RF Workbench / Re: New 850mW HF beacon,

« on: February 08, 2022, 1135 UTC »

You can continue your discussion in this topic in this forum 👍

https://ham-se.translate.goog/threads/el-pitico-qrp-bygge-foer-cw.27053/?_x_tr_sl=sv&_x_tr_tl=en&_x_tr_hl=sv&_x_tr_pto=wapp

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The RF Workbench / Re: New 850mW HF beacon,

« on: February 07, 2022, 1655 UTC »

You’ve made my day! 🤣

//QRP

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The RF Workbench / Re: New 850mW HF beacon,

« on: February 07, 2022, 1352 UTC »

Have a close look att the Xtal 7030 MHz
and between XTAL and earth there is a diode.
Can you see it now? 😊

See figure in this link:
https://ham.se/attachments/diod-png.7738/

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The RF Workbench / Re: New 850mW HF beacon,

« on: February 06, 2022, 1710 UTC »

Try putting the diode in series with the crystal I this way:

---diod---xtal---earth

Did you get it? 😄

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The RF Workbench / Re: New 850mW HF beacon,

« on: February 06, 2022, 1643 UTC »

Try putting the diode in series with the crystal against earth instead. 👍

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Amateur Radio / Re: Xiegu G90

« on: November 05, 2021, 0910 UTC »

Some interesting notes on XIEGU G90 Transceiver

https://radio.thulesius.se/sdr/xiegu-g90-transceiver/

//QRP

7

The RF Workbench / Re: EMTX

« on: October 27, 2021, 0749 UTC »

Quote from: Charlie_Dont_Surf 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.

👍

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The RF Workbench / Re: EMTX

« on: October 25, 2021, 0737 UTC »

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

9

The RF Workbench / 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

10

HF Mystery Signals / Re: 6505 kHz digital signal - mixed modes

« on: February 01, 2021, 0934 UTC »

8580 kHz is a common frequency for this signal, and is often paired with 4346, 6504 and 12982 kHz USB. They all carry the same message(s) over and over so they are believed to be either channel markers, propagation markers and/or information about status of other South African Navy working channels on the bands. 4245, 6407, 6493 and 8603 kHz are believed to be the above mentioned working channels and carry the actual messages because the length of transmissions may vary.

https://www.sigidwiki.com/wiki/Saab_Grintek_MHF-50_MFSK_Modem

11

General Radio Discussion / Re: Pirate radio station shown on Google Maps

« on: December 30, 2020, 1437 UTC »

The picture shows his radio call
https://tinyurl.com/AscensionPirate

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Equipment / Re: 6P1 tube transmitter 5W tube shortwave transmitter on AliExpress for $32.87

« on: October 14, 2020, 1550 UTC »

DIY

http://nmwilliam.tripod.com/el84.html

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The RF Workbench / Re: HF Beacon, design questions

« on: June 12, 2020, 0724 UTC »

Dave Richards (AA7EE) has written an interesting article detailing his 1mW solar-powered HiFER beacon project

https://aa7ee.wordpress.com/2019/01/03/putting-the-hifer-brs-boris-beacon-on-the-air-finally/

https://aa7ee.wordpress.com/2018/05/07/the-boris-beacon-a-1mw-solar-powered-hifer-beacon/

14

Utility / Re: WWV announcement of military exercise?

« on: April 10, 2020, 1041 UTC »

The US Department of Defense (DOD) plans to start making use of a provisional time slot on WWV and WWVH to announce upcoming HF military communication exercises and how the Amateur Radio community can become involved in them. The announcements will occur at 10 minutes past on WWV and at 50 minutes past on WWVH. WWV and WWVH transmit on 2.5, 5, 10, 15, and 20 MHz.

Department of Defense to Transmit Interoperability Exercise Info via WWV/WWVH
http://www.arrl.org/news/department-of-defense-to-transmit-interoperability-exercise-info-via-wwv-wwvh

//QRP

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