CQ-DATV Issue 94 – April 2021

CQ DATV 94 April 2021

The new issue of CQ-DATV is available for download Contents Production Team Editorial News and World round up A Cheap ATV Amp for 420-450 MHz Does DATV Radiate as Far as FM-Voice ? Grass Valley Mixer Conversions – Part 27 Phase Noise Issue Resolved for ADF-5355 MiniTutiouner-Express advert QO-100 All Modes Station Mixed Remote Station Based on SDR ADALM-PLUTO From…

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23cm band in the spotlight with regulators

IARU VHF UHF µWave Newsletter

During the week 15 – 19 February, the preparatory work for WRC-23 agenda item 9.1b continued in ITU‑R Working Party 4C (WP4C). The WRC agenda item has initiated technical studies on coexistence between the radio navigation satellite service (RNSS) and the amateur services in the 23cm band. As usual, the IARU participated in the meeting and delivered key information on amateur activities in this important microwave band. This information is vital…

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World record on 122 GHz, experience and equipment [2014]

122 GHz OE3WOG OE5VRL

Matej OK1TEH made a full translation into Czech and English (with permission from OE5VRL and OE4WOG) of one very interesting article about 122 GHz. The article isn’t new but it hadn’t been online till now. Thank you to Matej OK1TEH for the translation and info about the article. The article you can read here: http://www.ok2kkw.com/47g/122g_oe5vrl_oe4wog2014eng.htm Enjoy reading! Picture: from the article

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UK MICROWAVE GROUP –Scatterpoint 2019

UK Microwave group

All Scatterpoint issues from 2019 have been published as a PDF and are now available for free download. In 2019 issues you can find many interesting articles like:  Eyal Gal Module for 10 GHz A 52 MHz to 13.6 GHz Signal Generator Based on the ADF5355 24GHz Personal Beacon using Alcatel ‘White Box’ Tx Module Horns for 122GHz Transceiver ……

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New 30THz band used for experimental Amateur radio communications

VK3CV 30THz

In November 2020, Andrew VK3CV / WQ1S and Karl VK3LN made a contact in a previously un-explored section of the upper electromagnetic spectrum at 30 Terahertz (THz) which is 30,000 GHz. A two way contact over 60 metres distance was achieved with 5×5 signals received each way. The contact is believed to be the first ever in this band anywhere…

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Two cheap QRP PAs for the 2.4 GHz uplink satellite QO-100

OK1UFC power booster wifi

Mira OK1UFC described two possibilities of how to use cheap small power amplifiers for boosting signal on 2.4GHz. If you love QRP and don’t mind the reports you receive for weaker, but sufficient signals on the QO-100 satellite for communication, you have several options for which PA to get. Link on original article <link> Enjoy reading!

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Directional Couplers: Their Operation and Application

Mini Circuits directional coupler

Interesting article from Mini-Circuits Blog: Directional couplers are an important type of signal processing device. Their basic function is to sample RF signals at a predetermined degree of coupling, with high isolation between the signal ports and the sampled ports — which supports analysis, measurement and processing for many applications. Since they are passive devices, they also operate in the…

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