Mitsubishi block madifications?
 

Hi Homebrewers,
Has anyone ever seen information on modifing the innards of Mitsubishi
M67730's.
The top comes off really easily and the input and output filters (which have
series inductors and caps to ground) seem to have several positions for
fitting the capacitors as though the block is quite wideband and the filters
set the bandpass.
Just an idea that these 30 Watt 170MHz units may easily be moved down onto
2m?
Has anyone attempted this?
Thanks in anticpation
Dave

Mitsubishi block madifications?
 

Dave Bullock wrote:
Hi Homebrewers,
Has anyone ever seen information on modifing the innards of Mitsubishi
M67730's.
The top comes off really easily and the input and output filters (which have
series inductors and caps to ground) seem to have several positions for
fitting the capacitors as though the block is quite wideband and the filters
set the bandpass.
Just an idea that these 30 Watt 170MHz units may easily be moved down onto
2m?
Has anyone attempted this?
Thanks in anticpation
Dave




Dunno about modifying them,but some of them will go a bit out of the
specified freq range,with a bit less gain/power output.
I have a 6W 420-450mhz module that works up past 467mhz,and still makes
4-5W output.

Mitsubishi block madifications?
 

On Feb 13, 6:57*am, "Dave Bullock" wrote:
Hi Homebrewers,
Has anyone ever seen information on modifing the innards of Mitsubishi
M67730's.
The top comes off really easily and the input and output filters (which have
series inductors and caps to ground) seem to have several positions for
fitting the capacitors as though the block is quite wideband and the filters
set the bandpass.
Just an idea that these 30 Watt 170MHz units may easily be moved down onto
2m?
Has anyone attempted this?
Thanks in anticpation
Dave

Might be fun to install a compression type variable cap and see if you
could tune it. It shouldnt be too risky if you keep your drive low.

Jimmie

Mitsubishi block madifications?
 

"Dave Bullock" wrote in message
...
Hi Homebrewers,
Has anyone ever seen information on modifing the innards of Mitsubishi
M67730's.
The top comes off really easily and the input and output filters (which
have series inductors and caps to ground) seem to have several positions
for fitting the capacitors as though the block is quite wideband and the
filters set the bandpass.
Just an idea that these 30 Watt 170MHz units may easily be moved down onto
2m?
Has anyone attempted this?
Thanks in anticpation
Dave

Series inductors and caps to ground indicate a low pass filter. The
arrangement
sounds like a harmonic filter. You probably can go lower in frequency with
no
changes.

Pete k1zjh