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.

  

Ed Marriner, W6BLZ/W6XM (SK)

One of ham radio's most prolific builders and authors
Category: Historic
 This tribute to Ed Marriner will be updated over time.   Having known his writings since my earlies ham days in the 1960s, I knew about the "SSB Transceiver from a BC453" conversion article/booklet, but until I had the good fortune to acquire two homebrew SSB transceivers made by his good friend Ernie Mason W6IQY did I know that my vintage SSB friend Lynn Fisk K5LYN was a...  READ MORE
- Robert Nickels (ranickels),  10/25/2020 
   EFJ transmitter sales data from former employees....  READ MORE
- Robert Nickels (ranickels),  09/16/2020 
   Like most hams, I remembered seeing the FPM-200 at an astronomical price in the 1962 Allied Radio catalog and wondering just how rich would a person have to be to own one?    For my 11 year old self, such things may as well have been on another planet, but well...things change.I'd seen only one FPM-200 sold (to a guy ahead of me at a hamfest) and in the pre-eBay era most rare ra...  READ MORE
- Robert Nickels (ranickels),  09/12/2020 
  

why 50 ohms?

The Forgotten Impedance
Category: Technical
 Why do we use 50 ohm cables?    If you're like most hams the answer is:  "I dunno!"In fact, it's a compromise (like most things in life) - between lowest loss when handling power and voltage breakdown, as Belden engineer Steve Lampen explains hereA pdf copy can be found below as well.   And now you know!...  READ MORE
- Robert Nickels (ranickels),  09/06/2020 
  

"Crystal Plugs"

DIY version by "RAN Crystals"
Category: Crystal Replacement
Crystal sockets were popular for pluging in ... crystals, of all things!   But they were also used for other purposes, such as the antenna relay connection on some EF Johnson transmitters.    If you want to connect a VFO to a transmitter with just a crystal socket, for example, you're going to have to either carve up an old FT-243 type crystal or if you want to outboar...  READ MORE
- Robert Nickels (ranickels),  09/01/2020 
  

A visit to the D J Everett III Radio Room

Honoring the legacy of a small town radio station owner
Category: Historic
Many successful career people are grateful for mentoring they received on the way to the top. But few have honored a memory as passionately as has been done by Beth Mann.   She's the owner of Ham Broadcasting which owns five stations in western Kentucky but the story is about her mentor, the late DJ Everett III who started WKDZ in Cadiz Kentucky in 1966.   Everett worked as...  READ MORE
- Robert Nickels (ranickels),  08/14/2020 
   Bob Heil's favorite radio is the Moseley CM-1 which the developer, John Clemmons, told Carl Moseley stood for Clemens Manufacturing number 1.   "No", Mr. Moseley said, "That stands for Carl Moseley number 1!"As that may be, there's yet another CM-1 receiver and it was made by the Multi Products Company of Oak Park, Michigan.As wikipedia states:  "CON...  READ MORE
- Robert Nickels (ranickels),  08/13/2020 
    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 

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