Posts Tagged ‘amateur radio’

Pastime Projects High Voltage Power Supplies

September 3, 2015

Pastime Projects (www.pastimeprojects.com) manufactures amateur radio kits. Two of our most favorite are the “Remember When” slat board 6V6 kit which was featured in the 1948 (and elsewhere) ARRL Amateur Radio Handbook. This simple transmitter used a 6V6 (or 6L6) vacuum tube on a chassis made of orange crate wood. It was designed for the amateur radio operator to send CW (code) on 80 or 40 meters.
Our more recent kit uses a metal chassis and an improved oscillator kit introduced in the 1960’s Handbooks. It was more stable, easier on crystals, and oscillated on 80, 40 and other bands by switching plug-in coils. Ours uses a 50 ohm link coupled output which matches today’s antennas, antenna tuners, low pass filters, and dummy loads.
These circuits, as first published, were often accompanied by a power supply design which used a 5 volt rectifier vacuum tube. We chose to use modern solid state silicon rectifiers instead. This eliminated the need for a 5 volt winding on the transformer, and the added heat, light, current demand, vacuum tube, tube socket and so
on associated with the rectifier tube.
The result is a simpler less costly power supply for you to build and enjoy. Best regards, Glenn Brown W8JZI for pastimeprojects.com

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What is next at Pastime Projects?

July 5, 2015

Got an email from one of our customers wondering why we didn’t make the output on our 6V6/6L6
transmitter kit a pi-network instead of link output. Very good question! Probably one factor
in our decision was the cost of the change. Variable capacitors are expensive. The chassis size
would probably have to be larger also. But, these are not big issues. He is probably right; we
should revisit the pi-output design.
Some of the projects underway now include:
1. Regenerative receiver with tube(s) and toroid coils – Short Wave design with capability
to tune ham radio cw, am, and ssb in a rudimentary fashion. Status at this time is a prototype
6 – 10 MHz model that is very promising. Needs to be simplified for easy duplication as a kit.
Current model runs on 12 volts dc. No project completion date set.
2. Our low pass filter design converted to PCB configuration. We have the tools but not
the talent or time to complete this task. Interested in volunteering your expertise in this
very basic board design?
3. Vacuum Tube T-R switch based on vintage Handbook designs for handling our transmitter/
receiver interconnection automatically transferring from transmit to receive mode. Well underway
with this project.
4. Simple receiver design, probably solid state, to allow reception of cw along with our
transmitters..

Any ideas or suggestions? Let me know. Glenn W8JZI(at)ARRL(dot)NET or go to contact us
page of http://www.pastimeprojects.com7.28.09 prod

Pastime Projects Aluminum Chassis 6V6 6L6 CW Transmitter Kit Now Shipping

April 25, 2015

APRIL 24, 2015   The new aluminum chassis transmitter kit manufactured by Pastime Projects (www.pastimeprojects.com) is now shipping. This kit features a pre-punched aluminum chassis, a 15 page manual, tube sockets, variable capacitor, key jack, SO 239 chassis mount antenna connector, expanded metal bottom cover, chokes, capacitors, resistors, power and hookup wires, coil form with instructions, new tested 6V6/6L6 vacuum tube, power wire cable sleeving,  and hardware. The design is based on handbook designs of the 1960’s and allows band changing with coils and crystals. It has been tested on 160 and 80 meters and suitable coils will be released in the near future.

The 6V6 MC Model kit can be purchased from www.pastimeprojects.com.  See the web page for further details.

Pastime Projects 6V6 Transmitter Kit Features

April 1, 2015

The new 6V6 MC Transmitter being introduced by Pastime Projects is a single tube CW (code) transmitter for use in the HF Amateur Radio Bands. The initial offering will be for 40 Meter Band operation. It is a vacuum tube kit which the buyer assembles. A complete manual is provided for those with technical ability and experience to assemble and operate. The design is based on circuits commonly used in the 1960 era of amateur radio. Some features of this project are described on the home page of the Pastime Projects Home Page found at http://www.pastimeprojects.com.

If you are interested in purchasing one of these kit when they are released, you can get on the first come, first served list by contacting pastimeprojects(at)yahoo(dot)com.  73 Glenn for Pastime Projects

Pastime Projects Vintage style 6V6 Tube Type CW Transmitter – Another reveiw.

February 8, 2014

We would like to thank Amateur Radio Operator WB0FDJ Clarence for his writeup in eHamNet of our slat board
vintage style 6V6 CW 80/40 meter CW kit. See http://www.eham.net/reviews/detail/10299. It is reviews like
this that bring others to our web page http://www.pastimeprojects.com . Thanks Clarence and happy operating!
Glenn pastimeproject(at)yahoo.com

Download Electronic Kit Manuals from PastimeProjects

October 21, 2013

Pastime Projects http://www.pastimeprojects.com has begun converting their manuals to PDF format. These manuals
for radio and electronic kit construction will be available on the web pages of Pastime Projects for your reading and
printing.
Hope this helps spread the interest in kit building of
ham receivers, transmitters, audio amps, and other electronic kits to the amateur radio community.
Please share the news with your friends and have them
visit http://www.pastimeprojects.com.. 73 Glenn NN8G

Summer at it’s best

July 26, 2013

Summer is in full swing here in mid ohio. We attended the radio hamfest in Van Wert Ohio and look forward to the Findlay hamfest later. Summer usually brings on lots of activities other than radio. We are working on stocking the new all metal chassis 6V6/6L6 little oscillator/transmitter kits. These have a bottom cover made of aluminum like the chassis itself, but with perforated holes for ventilation. We have measured power out at various plate voltages. The output ranges from about 2 watts at around 200 VDC to over 10 at 350 VDC through the link coupling which matches 50
ohms impedence. The link coupling keeps the kit simple and less expensive that a pi-network. Besides most modern radios use 50 ohms impedance output. My thinking is to supply the kit with a companion power supply that will provide the filament voltage of 6.3 VAC as well as 200 VDC for the plate.
This is plenty of power for some great CW contacts. Those more experienced would probably prefer to build their own power supplies anyhow. You can save a lot of money on used
transformers, chokes, and so on. Have your priced new transformers lately?
Enjoy your summer. Remember http://www.pastimeprojects.com when
cooler weather brings back ham radio building projects to the old work shop.. 73 ES BCNU! Glenn