[R-390] Digital Radio Mondiale

Fri, 16 May 2003 18:47:02 -0700 (PDT)

Miguel,

I received a mixer kit from [email protected] cost 25 Euros (about the same for dollars US)
yesterday in the mail from Germany.
It is VERY small. About 1/2" square. There are few connections, an "in" and an "out" and a volts 7
- 20 v has its own onboard regulator.

The LC version specifications say it can be tuned + or - 12kHz from 455kHz have not hooked it up
yet, so it may go to 500kHz.

It is so small it can easily be installed inside anything, but my idea was to build it inside a
small 'die cast' metal box, with IF in IF out and volts in using BNC plugs etc. In this way I
could move it around and try it on a variety of rigs.

An ideal solution would be to get the Crystal controlled version and switch in crystals for the
IF's

455kHz IF  = 467kHz crystal (supplied)
500kHz IF  = 512kHz crystal (still looking for one)
100kHz IF  = 112kHz crystal (hopeing to find one....)
 50kHz IF  = 62kHz probly easier to make an LC or other higher oscillator with a divider circuit,
a bit on the complicated side so not considering this seriously, but would be nice to see how the
Hammarlund HQ-180 performs or even the Hallicrafters SX-100.

For a R-388, I would connect to the IF out J104 to the "mixer" then the 12kHz IF out to the sound
card input on the PC/laptop and then use the sound/speaker output to listen to the recovered
audio. This needs the 512kHz oscillator/crystal. No mods to the rig at all.

What do you think ????

--- Miguel Bravo <[email protected]> wrote:
> 512 kc/s was standard in all marine MF TX equipment being used when 500 kc/s
> was in distress traffic. Big rocks, hard to drive but not for a boatanchor
> driver.
> Let us know what to do with the R-388J, the old spare freq and the sound
> board.
> 
> Miguel
> 
> 
> ----- Original Message -----
> From: "Rodney Bunt" <[email protected]>
> >
> > Any one know of a 112 Khz rock, so I can use my RA-17 ??? or a 512kHz rock
> for the R-388 DRM mixer
> > ???
> >
> > Rodney
> > VK2KTZ
> >
> >
> 
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