The antenna transfer relay operates from the 9 volt bias line. Would need to
figure out what would be needed to operate the relay with the voltage being
lowered. It may work on 5 volts? Mike
-----Original Message-----
From: Bill Olson <callbill@hotmail.com>
To: k3sk@buckwalter.co <k3sk@buckwalter.co>; mikflathead@aol.com
<mikflathead@aol.com>; vhfcontesting@contesting.com
<vhfcontesting@contesting.com>
Sent: Mon, Dec 27, 2021 4:13 pm
Subject: Re: [VHFcontesting] need Mits M57762 1296 amp module -replacement
#yiv4833294956 P {margin-top:0;margin-bottom:0;}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 K3SKDave 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> on
behalf ofk3sk@buckwalter.co <k3sk@buckwalter.co>
Sent: Sunday, December 26, 2021 1:23 AM
To: mikflathead@aol.com <mikflathead@aol.com>;vhfcontesting@contesting.com
<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
de K3SK
-----Original Message-----
From: mikflathead@aol.com <mikflathead@aol.com>
Sent: Saturday, December 25, 2021 10:51 AM
To: 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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