[HQRP] Fwd: [AQRP] QRP Power Supply Recommendation

[Ed Manuel (N5EM)]

 From Monty in Austin.  Might be just the thing you have been looking for.


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>From: Monty N5FC <n5fc@io.com>
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>Date: Tue, 25 Sep 2001 23:09:39 -0500
>Subject: [AQRP] QRP Power Supply Recommendation
>
>Hey Gang!
>
>I'm not inclined to get spun up very often, but I recently ran across a
>couple of good values that I thought the QRP community would want to know
>about.
>
>The first is a perfect QRP bench supply.  I reserved judgment until I had a
>chance to evaluate it, but now that I know what a bargain it is (at
>$16.95), I'll let all of you have at it:
>
>Go to http://www.mcmelectronics.com/ and do a search on part number 28-2200
>
>Don't be fooled by the word "switchable" into thinking this is a switching
>power supply (with all the attendent RFI).  Although it's nearly as compact
>as one, it's a linear-regulated supply (using an LM317) with a good heavy
>transformer and internally mounted heatsink.  Rated at 2 Amps output, you
>can dial up from 3 to 12 Volts well-regulated output, in 1.5 Volt steps,
>using a front panel rotary switch.  Two good-quality binding posts on the
>front panel, for making connections via wire or banana plugs.  I measured
>the output while operating my TenTec 1340 (which draws about 800 mA during
>transmit, and outputs about 4 Watts.  With 12.20 V at 35 mA load, and 12.22
>at 800 mA load, I felt regulation was pretty good.  Output ripple was 2.1
>mV and 2.9 mV, no load and loaded, respectively.  I could hear no hum
>whatsoever in the receiver.
>
>By the way, a quick look inside reveals that the voltage settings are set
>by resistors, and would be easy to modify, should you want 13.5 volts
>instead of 12 Volts (although you may not get a full 2 A at the higher
>voltages), or 5 Volts instead of 4.5.  Because of it's compact size and
>switchable outputs, this makes an ideal supply for the homebrewing QRPer.
>
>Not sure what its short-circuit performance will be (and sorry, I refuse to
>test it the only way I know how ;-)
>
>Secondly, MCM also has 2SC2166 RF Power Transistors for $1.53/ea... a GREAT
>price (the 2SC2166 is a 6 Watt emitter-ballasted HF NPN power transistor,
>in a TO-220 package, suitable for linear or Class C operation with
>excellent VSWR survivability)  Find the data sheet at:
>http://www.mitsubishichips.com/data/datasheets/hf-optic/hf-opticpdf/ds/sc2166.pdf 
>
>
>
>Have at it!  (and I have no connection to MCM electronics except that I'm a
>satisfied customer)
>
>
>72,
>monty  N5FC
>
>Monty Northrup, N5FC
>Austin, Texas
>e-mail: n5fc@io.com
>web page (ham radio): http://www.io.com/~n5fc
>web page (home): http://www.io.com/~maddog
>
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Ed Manuel, N5EM	Houston, TX (Harris Co.) EL29
Houston QRP Club, Houston Amateur Television Society
http://www.n5em.com/	 n5em@amsat.org



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