What's in MIP's Shop?

Here's a few of things I've got laying around that I'd just as soon put in the hands of someone who will use it.

I am receptive to trades more so than I am looking for cash. I am in the market for duplexers and IM panels / isolators / circulators in both VHF high band and UHF, suitable for use in amateur applications (144 - 148 MHz and 420 - 450 MHz ranges). I am always interested in Daniels MT-3 modules and equipment. If you have any gear answering to those descriptions, I want to hear from you!

Thanks for shopping!

  Hewlett Packard HP63917F
DC switching power supply
Daniels Electronics MT-3 modules
What's in the pipeline?





Daniels Electronics MT-3 Modules

I have a surplus of various VHF high band and UHF MT-3 modules for Daniels Electronics base station / repeater systems.
They are:




UR-2 crystal receiver



Most transmitter modules can be supplied in either wideband (+/- 5 kHz) or narrowband (+/- 2.5 kHz) modulation bandwidth.
Some modules may be incomplete, i.e. missing parts. I can provide detailed information about any of them, and will bench test them with my HP8935 service monitor before selling them. If desired and possible, I can tune them to a desired operating frequency for you.

Please also note that I am open to trading for other MT-3 gear. Specifically, I am looking for wideband MT-3 receivers in VHF and UHF, as well as power amplifiers in VHF and UHF. If you've got some you don't know what to do with, and need something I have, let's talk!


Hewlett Packard HP63917F 14.5V 20A switching power supply


Believe it or not, this switching power supply was for years the only power source for a 220 MHz repeater in southern California. I cleaned it up from that use, tested it to make sure it does what it's supposed to do, and kept it for my own use.

This supply has adjustable output voltage (+/- 5% from 14.5 VDC), remote voltage sensing capability, adjustable current limiting, and over-current shutdown capability.

No manual. Finding one might be a trick. This is a "never say die" veteran of the days of the real Hewlett Packard, part of their historic Test and Measurement sector dating from the 1980s and 1990s. I used to repair and calibrate these things for a living, but moved on from HP in 1993 when it became obvious that they were going to spin off the T&M sector to become Agilent. Nothing against Agilent, I just wanted to explore the job market. In any event, finding a manual for this supply might be tedious, but as the supply appears here you only need to plug it in to a 115VAC outlet and approximately 14 volts will be present at the output bars. It can't get much simpler than that. If you're curious about how it works, some basic theory from a manual for a similar HP supply of the same vintage can be found here, and an overview of the theory can be found here.

I was using this as my work bench DC source up until a few months ago. It is stable, quiet (electronically ... the cooling fan is somewhat noisy in an otherwise quiet room), efficient, and reliable. I never had any trouble with it.


What's in the pipeline?

Kenwood TK-630/830 dual band mobile radio system.

Stay tuned!


Questions? Drop me a line. I will consider trades on any of the equipment that appears on this page.

E-mail Paul KB6MIP

Page last updated 28 April 2023