[MRCA] weekend

[Jack Antonio]

On 3/20/2016 3:46 PM, Meir WF2U wrote:

> Talking about the ARC-38: I managed to find one original, "non-A" as they
> say in the R-390A circles... I have the original military power supply for
> it and also a 115 VAC 50 Hz to 115 VAC 400 Hz static inverter. I could only
> find an ARC-38A control box, which is actually a depot-converted one
> originally made for the ARC-38. The mods are listed in the ARC-38/ARC-38A
> manual so I may be able to reconvert to the original if I can figure out how
> to disassemble the control box innards, which looks like a Chinese puzzle
> and packed like a sardine can. Anyone with experience/ideas of converting
> the function switch back to original or just using as it is, simply using
> different pins on the remote connector?
> Or, better yet, does anyone have a line on an original C-1398/ARC-38 control
> box?



The C-3428/ARC-38A box will work with the RT-311 with no wiring changes
or modifications. Simply wire it up as a C-1398 as the book shows.

On/off, frequency selection, local remote switching,
channel presets are all the same, and the AM and CW modes will 
correspond with AME and CW on the control head. The SSB/FSK position 
will bring up AM operation, but with the narrow filter selected.

The mode switch also rearranges the gain control lines between the
various modes, and the gain controls will not be correct in the SSB/FSK
position.

The modification involves more than a wiring change, one switch wafer on
the mode switch is different between the two, this wafer being a part
of the gain control switching I mentioned above.

I wound up intercepting the the filter select lines so I could switch
between narrow and wide independent of the control head, and I ignored
the SSB position altogether.

As far as availability goes, I have seen the C-1398 show up once
in a great while on the auction place, so keep your eyes open.

I've also found the ARC-38 works well on CW, I've checked into
the Sunday night net a few times with it.


Jack Antonio WA7DIA/4