[1000mp] Additional information on ref oscillator mod

[Tod - Minnesota]

I have posted additional pictures of the ref oscillator mod that I made at
www.k0to.us . The pictures have links in the table following the home page
picture. The four pictures showing the reference oscillator board and the
modifications are DSCN4434,DSCN4435, DSCN4442 and DSCN4443. The
thermistor-resistor circuit is one that uses a 25V50/50C positive
temperature coefficient thermistor, (Mouser part # 527-3006-25V50/50C  about
$2.28) in series with a 1/4 watt 68 ohm resistor connected between ground
and the +9 volts on the board. One lead of the thermistor is soldered to the
case of the crystal and from there to ground. The other lead of the
thermistor goes to the 68 ohm resistor which has its other end connected to
+9 volts. The thermistor should be physically touching the crystal case to
assure good heat transfer. Remove the board before working on it. Scrape the
metal case in a thin line so that you can put a bead of solder on the case
(20 watt iron is plenty hot). Then solder the thermistor lead to the case
along the solder line. Dress the ground lead to the bottom of the board per
the picture. Connect the 68 ohm resistor to the +9 volt point shown on the
picture. Use insulated tubing to protect the leads from shorting.

Tod, K�TO