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#1
February 13th 08, 11:57 AM
posted to rec.radio.amateur.homebrew
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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 |
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#2
February 14th 08, 03:49 PM
posted to rec.radio.amateur.homebrew
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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. |
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#3
February 14th 08, 08:55 PM
posted to rec.radio.amateur.homebrew
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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 |
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#4
February 15th 08, 01:00 AM
posted to rec.radio.amateur.homebrew
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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 |
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