Hi,

I am searching for an Layout of a 10W output PA for my Transverter. I need
just one for 2m and one for 70cm. Has anyone a Layout or schematic to build
it on my own ?

Thanks

Markus

If you need that much gain, you're best off with an amp module from
Motorola or someone.

At VHF, 30mW in for 10W out will have serious stability problems if done
discretely and if not layed out just perfect.

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca

On Fri, 30 Apr 2004 06:56:11 GMT, Gregg wrote:

If you need that much gain, you're best off with an amp module from
Motorola or someone.

At VHF, 30mW in for 10W out will have serious stability problems if done
discretely and if not layed out just perfect.

Yeah, for simplicity the modules rule, but it's hardly in the spirit
of homebrewing, is it? Whilst it's hardly a beginner's project, I
don't see why anyone who knows what they're doing couldn't build one
of these from discretes and have a lot of fun doing so. Where do you
suppose most of these "serious stability problems" are going to arise?

--

The BBC: licenced at public expense to spread lies.

Behold, Paul Burridge signalled from keyed 4-1000A filament:

On Fri, 30 Apr 2004 06:56:11 GMT, Gregg wrote:

If you need that much gain, you're best off with an amp module from
Motorola or someone.

At VHF, 30mW in for 10W out will have serious stability problems if done
discretely and if not layed out just perfect.

Yeah, for simplicity the modules rule, but it's hardly in the spirit of
homebrewing, is it? Whilst it's hardly a beginner's project, I don't see
why anyone who knows what they're doing couldn't build one of these from
discretes and have a lot of fun doing so.

Quite true!

Where do you suppose most of
these "serious stability problems" are going to arise?

RF feedback between the stages is the biggest enemy. If it's well shielded
and maybe a bit of neutralization, he should have no probs then :-)

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca

Behold, Paul Burridge signalled from keyed 4-1000A filament:

On Fri, 30 Apr 2004 06:56:11 GMT, Gregg wrote:

If you need that much gain, you're best off with an amp module from
Motorola or someone.

At VHF, 30mW in for 10W out will have serious stability problems if done
discretely and if not layed out just perfect.

Yeah, for simplicity the modules rule, but it's hardly in the spirit of
homebrewing, is it? Whilst it's hardly a beginner's project, I don't see
why anyone who knows what they're doing couldn't build one of these from
discretes and have a lot of fun doing so.

Quite true!

Where do you suppose most of
these "serious stability problems" are going to arise?

RF feedback between the stages is the biggest enemy. If it's well shielded
and maybe a bit of neutralization, he should have no probs then :-)

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca

On Fri, 30 Apr 2004 06:56:11 GMT, Gregg wrote:

If you need that much gain, you're best off with an amp module from
Motorola or someone.

At VHF, 30mW in for 10W out will have serious stability problems if done
discretely and if not layed out just perfect.

Yeah, for simplicity the modules rule, but it's hardly in the spirit
of homebrewing, is it? Whilst it's hardly a beginner's project, I
don't see why anyone who knows what they're doing couldn't build one
of these from discretes and have a lot of fun doing so. Where do you
suppose most of these "serious stability problems" are going to arise?

--

The BBC: licenced at public expense to spread lies.

I am searching for an Layout of a 10W output PA for my Transverter. I need
just one for 2m and one for 70cm. Has anyone a Layout or schematic to
build
it on my own ?
==========================
Suggest you consider Mitsubishi RF Power modules (still available)

for 144 - 148 MHz : M57713 P(max) =
10W (for linear duty)
M57719
P(max) = 21 W
M57715
P(max)= 20 W
or Toshiba SAV17
P(max)= 25 W
or Motorola MHW612
P(max)=25W

For 430 -450 MHz M57716 P(max)= 10
W ( for linear duty)
M57729
P(max)=?
or Toshiba S-AU4
P(max)= 10W

Not all the modules might be suitable for linear operation (SSB) so you have
to check with supplier.

Here in the UK a supplier still carrying these Mitsubishi power modules is
Mainline Electronics - Leicester
www.mainlinegroup.co.uk

An excellent book for homebrew transverters and power amps with the above
modules :
The VHF / UHF DX Book , edited by Ian White , G3SEK.

Frank , GM0CSZ / KN6WH

http://www.rfparts.com/

They have a ton of "brick" modules by Motorola, Mitsubishi, etc. These
devices are the cat's a**! They basically need DC power and In/Out pins
hooked up. As others mentioned, some are for FM/CW and some are linear
(SSB, AM, etc.)

Scott


Dr.Ice wrote:
Hi,

I am searching for an Layout of a 10W output PA for my Transverter. I need
just one for 2m and one for 70cm. Has anyone a Layout or schematic to build
it on my own ?

Thanks

Markus

RF Parts is nice because they tend to have stuff you can't get anywhere
else. HOWEVER, one caution ... if somebody else has it, somebody else will
almost always be cheaper. Of course there are exceptions to prove the rule,
but they are definitely the high-priced spread.

Some of those modules do look like they are -exactly- what OP was looking
for, tho.

...

"Scott" wrote in message
...
http://www.rfparts.com/

They have a ton of "brick" modules by Motorola, Mitsubishi, etc. These
devices are the cat's a**! They basically need DC power and In/Out pins
hooked up. As others mentioned, some are for FM/CW and some are linear
(SSB, AM, etc.)

Scott

RF Parts is nice because they tend to have stuff you can't get anywhere
else. HOWEVER, one caution ... if somebody else has it, somebody else will
almost always be cheaper. Of course there are exceptions to prove the rule,
but they are definitely the high-priced spread.

Some of those modules do look like they are -exactly- what OP was looking
for, tho.

...

"Scott" wrote in message
...
http://www.rfparts.com/

They have a ton of "brick" modules by Motorola, Mitsubishi, etc. These
devices are the cat's a**! They basically need DC power and In/Out pins
hooked up. As others mentioned, some are for FM/CW and some are linear
(SSB, AM, etc.)

Scott