The M57762's will keep getting harder and harder to get. They were great in
their day but are very old technology.. I know people have retrofitted the
newer LDMOS modules for older bipolar units but I'm not saying it's easy in
every case, just something to look at.. Sounds like Terry W8ZN has actually
done the swap in his FT736 with greatly improved performance so, since Mike has
the same rig I would seriously look at this as an option.. required a 3
terminal regulator change, not sure about the pinout.. I know the MOS devices
run more efficiently so I expect more power with less heat woo hoo!
once again just another "voice from the wilderness"...
bill
________________________________
From: k3sk@buckwalter.co <k3sk@buckwalter.co>
Sent: Sunday, December 26, 2021 11:14 PM
To: 'Bill Olson' <callbill@hotmail.com>; mikflathead@aol.com
<mikflathead@aol.com>; vhfcontesting@contesting.com
<vhfcontesting@contesting.com>
Subject: RE: [VHFcontesting] need Mits M57762 1296 amp module -replacement
Interesting idea Bill. But like you said, its not a drop-in replacement. As
my TS-790A uses the M57762, I did a quick search on the feasibility of the
change if I ever face the situation of needing one, I found this (link) that
provides some detailed insight to making the change.
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwjmq5iEyIL1AhX1qXIEHbnxB9AQFnoECAUQAQ&url=http%3A%2F%2F01895fa.netsolhost.com%2FPDF%2FMOSFET%2520PA_pdf.PDF&usg=AOvVaw2vHeTfTbNNlJbFNltf7Gyx
de K3SK
Dave
From: Bill Olson <callbill@hotmail.com>
Sent: Sunday, December 26, 2021 12:45 PM
To: k3sk@buckwalter.co; mikflathead@aol.com; vhfcontesting@contesting.com
Subject: Re: [VHFcontesting] need Mits M57762 1296 amp module
Mike, Instead of continuing to search for the old bipolar module I think I'd
try to "modernize" and rework your amp to use one of the modern MOSFET modules
like the Motorola RA18H1213G. (The M57762 is probably 30+ year old technology.)
RF Parts has the RA's for $71 and you can probably find them cheaper.. still
from the US instead of Italy or who knows where.. It's not a "drop in" but
easily retrofitted and requires a bit less drive for a bit more power..
my $.02
bill, k1DY
________________________________
From: VHFcontesting
<vhfcontesting-bounces+callbill=hotmail.com@contesting.com<mailto:vhfcontesting-bounces+callbill=hotmail.com@contesting.com>>
on behalf of k3sk@buckwalter.co<mailto:k3sk@buckwalter.co>
<k3sk@buckwalter.co<mailto:k3sk@buckwalter.co>>
Sent: Sunday, December 26, 2021 1:23 AM
To: mikflathead@aol.com<mailto:mikflathead@aol.com>
<mikflathead@aol.com<mailto:mikflathead@aol.com>>;
vhfcontesting@contesting.com<mailto:vhfcontesting@contesting.com>
<vhfcontesting@contesting.com<mailto:vhfcontesting@contesting.com>>
Subject: Re: [VHFcontesting] need Mits M57762 1296 amp module
These guys have 97 in stock ---
https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.rf-microwave.com%2Fen%2Fmitsubishi%2Fm57762%2Fuhf-power-amplifier-module%2Fm57762%2F&data=04%7C01%7C%7Cb984b3b99d4946350ebb08d9c80e7488%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637760786675904929%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=qRlejtAgywcuUqz%2FGs1ExUe%2BBsyC9iinkTcEJbFwr6o%3D&reserved=0<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.rf-microwave.com%2Fen%2Fmitsubishi%2Fm57762%2Fuhf-power-amplifier-module%2Fm57762%2F&data=04%7C01%7C%7Cfc573d521b194cf5b4a608d9c8c5ab17%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637761573608241199%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=nXr6G6%2BHLkLCB3F5IcUbIn%2F2ia%2BZSrqLOq3ullmMU8g%3D&reserved=0>
de K3SK
-----Original Message-----
From: mikflathead@aol.com<mailto:mikflathead@aol.com>
<mikflathead@aol.com<mailto:mikflathead@aol.com>>
Sent: Saturday, December 25, 2021 10:51 AM
To: vhfcontesting@contesting.com<mailto:vhfcontesting@contesting.com>
Subject: [VHFcontesting] need Mits M57762 1296 amp module
I have tried unsuccessfully to purchase one off Ebay. All I got were 2 bad
ones. Can someone recommend a supplier of these. RF parts is out. Happy
Holidays. Mike
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