Just wanted to send you a short note to thank you for your great, quick response from the “crystal exchange program”! I mailed two crystals in for the first time last Saturday and received my requested ones this Saturday. Wow! Radical RC” Crystal exchange program” really rocks! I’m an older, retired, fixed income RC flyer and such a program is a big plus to me.

Thanks again!
Jerry 03-17-2013


Dayton Hamvention 2012 May 18-20

Hamvention Aerial View
Hamvention Aerial View

Yes, everything you see in the lot is a vendor booth with the exception of the left most triangle. The entire building is full. Several RC vendors with cross-over products attend this event.

Audio Commercial for Hamvention

Hamvention Home Page

I had a ball here one year ago. Not exactly modeling, however, it’s a tinker’s delight. You need to attend this event once in your lifetime. Lots of radio, computer, antenna and misc here. You can see it in one day if you keep those feet moving fast all day.


Doc Brown Power Supplies Checked For Possible HAM Usage

I’ve had several inquirys wondering if these power supplies can be used for Ham purposes. A local Ham checked one out and writes:

Dave …
I’ve used this with a Yaesu FT-817 (5 watt, around 2 amp), scanned across the bands, and found several places where there are “birdies” or RF that can interfere. It seems to be on the power line, since I had no antenna attached at the time.
1.805 MHz, 1.784, 1.685, etc. These likely come from the switching mode, since the signal disappears when the power supply is unplugged. I would suggest that HF ( from 1.8 MHz to around 30 MHz) may be usable on some bands, but not all. At VHF and UHF frequencies it is well filtered enough to use, that is at 140 MHz and 430 MHz. With its current level it could run a 100 watt repeater at VHF nicely.
Of course, this isn’t at the same level evaluation as someone at the ARRL or FCC labs, since I have not measured the actual level of signal involved. I can not see anything on the Tektronics oscilloscope, but it only goes to 2 mV/cm. A signal at that level would be rather loud.

John Hepner KA8ZSB