Just some thoughts on the conversion. All of the new modules are FET and
don't use 8v for bias, they use 5v so you need to add a regulator to bring
the 8v down to 5v. The FET units also take less drive so you might need an
attenuator. The good news is they will put out more so you might see 20w !!!
One of my 736's I install a new 70cm module and it worked out fine after
doing the above changes.
Terry Price - W8ZN
Directive Systems and Engineering
703-754-3876
On Fri, Aug 29, 2025 at 2:59 PM mikflathead--- via VHFcontesting <
vhfcontesting@contesting.com> wrote:
> Thanks for the heads up on the conversion. Mike
> On Friday, August 29, 2025 at 02:30:27 PM EDT, <k3sk@buckwalter.co>
> wrote:
>
> Convert it to the RA18H1213G which is a replacement for the obsolete
> M57762
> power module. The RA18H1213G requires significantly less drive power (200
> mW
> vs 1 watt) and a lower gate voltage (+5VDC at 1 mA vs +9VDC at 500 mA),
> resulting in a more efficient and simpler hybrid power amplifier design
> that
> does not require a heat sink for the control pin or bypass components for
> the hybrid. There are several sources on the web detailing how to do the
> conversion.
>
> https://www.ahrdf.net/forum/printthread.php?tid=800
>
>
> K3SK
>
>
>
> -----Original Message-----
> From: VHFcontesting
> <vhfcontesting-bounces+k3sk=buckwalter.co@contesting.com> On Behalf Of
> mikflathead--- via VHFcontesting
> Sent: Friday, August 29, 2025 2:08 PM
> To: VHF Contesting <vhfcontesting@contesting.com>
> Subject: [VHFcontesting] Yaesu FT-736 1296 power amplifier
>
> If someone has the final rf amplifier section in a module they don't need
> please let me know. I have purchased what I had hoped was a good M57762
> module but got a lemon. Thanks Mike
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>
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