RAN Technology

Ad-Hoc Hybrid transceiver with 3-400Z finals?


Vintage Ham Radio 0 Comments 04/04/2020 

Dentron MLX-MINI gets some boots

Posted By: Robert Nickels (ranickels)

 

The  Dentron MLX-MINI

I thought it would be cool to use the Dentron MLX-MINI on the Saturday Vintage Sideband Net but it's a little marginal since the rule is "no tubes, go home!".   However hybrid rigs are allowed, and Special Dispensation is given for rigs with Red LEDs.    So I thought the MLX was double-qualifed - even more so after I realized the red LED display wasn't even working.   After finding the Net by dead reckoning I checked the output from the Henry 2K which was serving as the PA section of my  Ad Hoc Hybrid and found it would making over 100 watts output on voice peaks.   Time to check in with my buddy and Official Boomaster and Net Control Extraordinaire, N9RK.

The heart of the MLX-series transceivers is the SG-9 board made by Mizuho Co. in Japan, which is an entire 9 MHz SSB exciter and receiver on one PCB.   The idea was to sell a building-block to radio manufacturers who could save time and money having to re-engineer this part of a radio every time they put out a new model.   But other than a few of it's own products, Dentron was the only amateur radio company that Mizuho was able to convince to take this approach, probably because Dentron was on the ropes at the time and really needed to get radios to market quickly.   While it wasn't enough to save Dentron, the radios built around the SG-9 are quite good and the board was also used in the Hull 924 marine radio, which had to pass FCC type acceptance.

While it is definitely an odd pair, the MLX-MINI (running on lithium-ion battery power) and the Henry 2K accomplised the task of getting into the net - and no boos!  

Check out the Vintage SSB Net for more info than you ever wanted to know about Old Sideband Junk and the Old Phartes who run them!

 

Click on the image title or on the image itself to open the full-sized image in a separate window.

    Jay Miller KK5IM recently wrote an article in Electric Radio magazine about fulfilling his dream of building a homebrew "AM Kilowatt" transmitter (375 watts output by today's standards).     His crystal-controlled exciter that drive the 813 was based on his Novice transmitter, which was built by his grand-uncle back in the 1960s when Novice class hams were l...  READ MORE
- Robert Nickels (ranickels),  07/09/2020 
  

Bias control of Class E amplfiers

Previously undocumented phenomenon
Category: Technical
Micro SDR innovator Guido PE1NNZ has implemented polar modulation using an Arduino MCU and a class E PA.   For more informartion on this fascinating project, join the discussion group at https://groups.io/g/ucxInitially, Guido's design implemented the polar or EER modulation scheme using modifications to the QCX CW transceiver hardware in the traditional way as described by Leonard K...  READ MORE
- Robert Nickels (ranickels),  06/20/2020 
    I'm always intrigued by the odd and unusual ham gear that I remember seeing in catalogs as a kid but have seldom seen after hundreds of hamfests and uncountable for sale listings.   One such is the Lysco mobile transmitter which was produced by the Lysco Manufacturing Company of 1401 Clinton St. Hoboken NJ between 1949 and 1953.   Despite being a very cute and co...  READ MORE
- Robert Nickels (ranickels),  06/06/2020 
  

Class E Notes

the result of experiments with high efficiency class E amplifiers
Category: Technical
 There is a lot of misunderstanding about how a Class E amplifier works.    Including my own ;-)   As the result of studying the literature and experimenting, I thought I'd share what I have learned.Below is an example of a test amplifier I used to optimize my 2 watt wspr transmitter boards.   It can be visualized as two circuits - the amplifier itself a...  READ MORE
- Robert Nickels (ranickels),  06/06/2020 
   Seeing this article on Hackaday about how a guy in China made a crystal set using the diode in a chip credit card for the detector reminded me of the Postcard Radio.  It was a project in the WWII-era "Boys Fun Book" that I had as a kid and although I remember it well I had no reason to build one because who would want to mail a radio to someone else?     I did ma...  READ MORE
- Robert Nickels (ranickels),  06/04/2020 
   What can I say, I like oddball radios!    There was already a different version of this CAI SSB-125 on my shelf but it had the remote control head, and this one was cheap, well under $100 including shipping, and I'm easily amused.   VIDEO DEMO HERECommunications Associates Inc. was a supplier of commercial, military, and marine radios based in Huntington Station, ...  READ MORE
- Robert Nickels (ranickels),  05/14/2020 
   The HW-16 had to be pushed aside while waiting for parts, creating an opening just big enough for the homebrew receiver I got recently via eBay for $18.50 - plus 2X that to ship it here.   I like saving and restoring old homebrew gear just out of respect for the amount of time and effort our forefathers put into making things from scratch, and this receiver intrigued me, as the IF transf...  READ MORE
- Robert Nickels (ranickels),  04/28/2020 
    The Multi Elmac Company of Hazel Park and later, Oak Park MI is best know amongst hams for it's great mobile transmitters and receivers which were probably the most popular rigs of their type and are still often used on AM today.   The Multi Elmac Net pays tribute to these little rigs by and typically a half-dozen or more are heard on the net weekly.But the company's origin...  READ MORE
- Robert Nickels (ranickels),  04/22/2020 
  

Wireless on a Train

a lesser-known radio "first"
Category: Historic
WHEN Frederick Wally stepped out of a little cubby-hole in one corner of the forward day coach on the Lackawanna Limited, west-bound, as it neared North Scranton, Pennsylvania, Tuesday, November 25, 1913, and pinned a sheet of paper on the wall, the passengers in the front seats, who had been casually wondering what caused the strange, crackling sounds that had been coming from the cubby-hole, pri...  READ MORE
- Robert Nickels (ranickels),  04/14/2020 

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