RAN Technology

W9RAN's "VERSA-TR" (as featured in Dec. 2018 QST)


New Product Announcements 0 Comments 11/11/2018 

A Versatile T/R solution for SDRs and vintage radios

Inexpensive Software Defined Radios offer excellent performance and value for hams and SWLs, but they lack key features that are needed for actual use on the air:

  • Provision for automatically muting the speakers when transmitting, to eliminate overloading and audio feedback.

  • A sidetone to monitor CW keying. SDRs do not provide a CW sidetone, and even worse, the time delay resulting from digital signal processing (“latency”) makes it impossible to monitor one’s own signal as can be done with a conventional receiver.

  • A convenient means of switching the antenna between the transmitter and the SDR receiver and protecting the receiver input during transmit.

The VERSA-TR was designed to address these shortcomings of SDRs, but also makes it easy to put low-power vintage and conventional radios together to create an integration station with automatic T/R switching, muting, and CW sidetone.    Only the antenna connections need be made since RF sensing eliminates the need to wire up relay contacts and muting circuits.   Regular or amplified PC speaker muting is plug-and-play.

The VERSA-TR can be used in a variety of ways with transmitters range from < 1 watt to 100 watts output, for CW, AM, SSB or other modes.   Watch this site for application notes showing various configurations and applications.

The VERSA-TR is available as an easy-to-build kit using all through-hole components from our friends at Hayseed Hamfest:

https://hayseedhamfest.com/products/ran-technology-versa-tr-switch

 


    Visitors to the Elgin National Historic area along the Fox River in Elgin Illinois may not realize they are at the site of a famous shortwave radio station - W9XAM - the time signal station operated by the Elgin Watch Company.Elgin was the only watch company maintaining an observatory that observed, recorded and broadcasted time from the stars correct to the hundredths of a second. Located a...  READ MORE
- Robert Nickels (ranickels),  05/09/2022 
  

The Mosley Commando II

Made in England and scarce even there
Category: Vintage Ham Radio
The Mosley CM-1 receiver is quite well known and not especially hard to find in the US even though it was the only radio produced by the company that has been well-known for antennas since 1939.   Or is it...?A full-page ad (advert for you on the other side of the pond) appeared in the RSGB Bulletin in 1963 for a nice looking and very capable SSB transmitter called the "Commando II&...  READ MORE
- Robert Nickels (ranickels),  04/15/2022 
   I'm not ready to publish a description of exactly HOW it works, but 20 minutes effort with scissors and tape produced a prototype  Droplet Energy Generator that allows me to say for sure that IT WORKS!I duplicated the design shown in this video.   I wrapped a scrap of plastic in aluminum foil, then applied a strip of double-sided tape and to that attached a piece of PTFE thread-...  READ MORE
- Robert Nickels (ranickels),  03/30/2022 
   When I was first licensed in the 1960s in Nebraska, two groups of hams were commonly heard on the air before those with jobs got off work - other teens like me and the disabled hams.   Some of my earliest Novice ham buddies were blind students at the Nebraska School for the Blind in Nebraska City, and there were many other visually-impaired hams, all of whom were exceptional operators, e...  READ MORE
- Robert Nickels (ranickels),  03/21/2022 
   Old style mica capacitors were used in the pi-net matching sections of several vintage transmitters and the combination of age, heat, and high RF currents have made them likely failure items.   My Collins 32V-2 transmitter was to the point where it would not properly load to full power on 75 meters so something had to be done.   Mica capacitors are no longer made but fortunately new...  READ MORE
- Robert Nickels (ranickels),  03/19/2022 
   I found myself wanting to convert various frequencies to other frequencies and wanted a cheap and easy solution, so I designed a simple "universal converter" using the NE-602 and a programmable oscillator from Epson.  I'd used the same combination in hundreds of "RANVerter" SDR Upconverter projects since my Dec. 2013 QST article and knew that while there were limitatio...  READ MORE
- Robert Nickels (ranickels),  03/17/2022 
   It's always a challenge to hold PC boards during assemly and testing.  After purchasing a magnetic holder from Amazon  I realized I wanted more and could easily make as many as I wanted using inexpensive 3 mm hardware from eBay and some strong "fridge magnets".     All that's needed is to epoxy a standoff to the magnet - both tapped and threaded ...  READ MORE
- Robert Nickels (ranickels),  03/09/2022 
   The Si5351 has been the biggest boon to homebrewers since the invention of the NE-602, especially now that quartz crystals are essentially obsolete.   But it's redundant to run the output of the 5351 through a johnson counter to develop the quadrature signals required for QSD/QSE SDR front-ends when there are three clock outputs available and the IC allows for phase offsets. &nb...  READ MORE
- Robert Nickels (ranickels),  03/09/2022 
   It's pretty well accepted that the Pacemaker was not EF Johnson's finest effort.   In fact it was the first of several failed attempts by the King of the AM Transmitters to make the transition to SSB.    In the end, it was the rise of CB popularity that kept the company viable, along with its component business, while their ham business gradually faced away. &...  READ MORE
- Robert Nickels (ranickels),  03/03/2022 
   LTC William L. Howard amassed a collection and in fact realized his dream of creating a museum that showcased the Army's technical intelligence operations - and a lot more.  The following excerpt was written by Col. Howard and Todd KA1KAQ:William L HowardI first got interested in radio while a Cub Scout back in 1954. I built the crystal radio set and the one tube set with help from an ama...  READ MORE
- Robert Nickels (ranickels),  02/18/2022 

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