[ICOM] IC-701

[Gary Fiber]

The PS-701 was an unregulated power supply. It output about 18 volts @ 20 
amps of current. You should only use this supply with an IC-701. The IC-701 
contains the necessary regulators with in it.
Remember the IC-701 radio was sold around 1977 to 1980 era so doing the 
regulation this way was fine, now days we seem to install the regulation 
within the power supply its self.

If you are a builder the PS-701 would be a fine base to build up a 
regulated power supply from.

I will say this : NEVER...NEVER use it with other 13.8 VDC products as the 
PS-701 will burn up any product that requires a  13.8 VDC regulated power 
supply.

Gary K8IZ


At 06:03 AM 1/7/2005, you wrote:
>I have recently acquired an IC-701 and have seen conflicting reports as to 
>the DC voltage required for proper operation. In various places I have 
>seen 13.8-volts (what I would expect) but I have also seen a value of 18 
>or 19 volts based on the fact (?) that the original power supply for the 
>'701 had an unregulated output in that range and all regulation takes 
>place in the transceiver.
>Which information is correct? I have used a 13.8 volt supply but have 
>noted some random frequency instability which causes me to wonder about 
>this issue.
>Jack, AE7DX

Gary Fiber K8IZ
GROL PG-19-6691
Washington State Resident