Re: [VHFcontesting] need Mits M57762 1296 amp module

[mike repinski via VHFcontesting <vhfcontesting@contesting.com>]

Terry, was the only change to change the voltage regulator? This seems like the 
way to go. Thanks for the info. Mike


-----Original Message-----
From: Terry Price <terry@directivesystems.com>
To: 'Bill Olson' <callbill@hotmail.com>; vhfcontesting@contesting.com
Sent: Sun, Dec 26, 2021 3:34 pm
Subject: Re: [VHFcontesting] need Mits M57762 1296 amp module

I agree with Bill, go with a new MOSFET unit but you have to replace the
bias regulator - or at least add a 78L05 on the bias line before the device.
The M57762 needs 8 volts and the RA18H1213G uses 5v max. I replaced the
older unit in my FT736 and went from 10w to 22+ watts.

Terry - W8ZN

-----Original Message-----
From: VHFcontesting
[mailto:vhfcontesting-bounces+terry=directivesystems.com@contesting.com] On
Behalf Of Bill Olson
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 of
k3sk@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-micr
owave.com%2Fen%2Fmitsubishi%2Fm57762%2Fuhf-power-amplifier-module%2Fm57762%2
F&amp;data=04%7C01%7C%7Cb984b3b99d4946350ebb08d9c80e7488%7C84df9e7fe9f640afb
435aaaaaaaaaaaa%7C1%7C0%7C637760786675904929%7CUnknown%7CTWFpbGZsb3d8eyJWIjo
iMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata
=qRlejtAgywcuUqz%2FGs1ExUe%2BBsyC9iinkTcEJbFwr6o%3D&amp;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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