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Collins 30L1

Jun 28th, 12:00

PY2ALR

Joined: Nov 22nd 2009, 11:00
Total Topics: 0
Total Posts: 0
I have a parasitic oscilation in the Collins 30L1. I need some explanation how to cancel this oscilation.
Jun 28th, 12:00

PY2ALR

Joined: Nov 22nd 2009, 11:00
Total Topics: 0
Total Posts: 0
30L1
Jul 1st, 14:27

W1VT

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
http://www.eham.net/ehamforum/smf/index.php?topic=70566.0;wap2

Tom W8JI suggests adding 20 or 30 ft of RG58 coax on the input of the amplifier to help stabilize it--as would a resistive attenuator.
Jul 1st, 19:17

WB1GCM

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
Collins supplied a specially designed RF interconnecting cable to use with the exciter of the 30L1; typically the KWM-1. This cable was special as it presented 50 ohms to the input circuits at all times.

Also, on another W8JI related topic regarding the 30L1, the AC power cord and transformer have wiring issues that are potentially dangerous. Collins made some serious errors wiring the power transformer. For safety sake, please read the information on the following link to make sure your 30L1 isn't wired in a dangerous manner:

http://www.w8ji.com/collins_30l1.htm





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