[R-390] Below 500 kHz mod, again?

[Bob Camp]

Hi

I have seen a no change mod for the Racal 6790 but I don't think there 
is one for the R-390. The way the front end of the R-390 works it would 
be a major mechanical mod to get the poor beast running below 500 KHz.

The best bet on an R-390 is to use an outboard up converter to boost 
the DC to 500 KHz band up to something like 2 to 2.5 MHz. There are a 
number of designs out there for these converters. Some of them do the 
up conversion at the antenna so they can combine a whip antenna pre-amp 
with the up converter. A bunch of the guys that show up in the archives 
here have a neat little whip pre amp they came up with. It would make 
an interesting starting point for a high performance antennal mounted 
converter.

	Enjoy!

	Bob Camp
	KB8TQ


On Sep 25, 2004, at 8:34 PM, John Seboldt wrote:

> I read and deleted the simple no-damage mod for opening up the R-390 
> below 500 kHz, before realizing that it probably would apply to my 
> R-392 also! Could somebody repost it again?
>
> Thanks
>
> John K0JD
> Milwaukee, WI
>
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