On 20 Sep 2006 01:13:01 GMT, Steveo wrote in
:

Frank Gilliland wrote:
On 20 Sep 2006 00:26:10 GMT, Steveo wrote in
:

Frank Gilliland wrote:
Enough of that cheap one-board crap..... this amp is MODULAR!

Cool. How about a high drive portable to go behind an HF rig? Variable
input 25/100w.

The intent is to drive this from a stock CB, but if you want scale it
up then it's an easy design modification to the input module. I can
include that as an option in the design. However, know that if FET's
are used for power transistors then most of your 25/100 watt drive
would be wasted.

Are FET's the most economical transistors, or are are there other choices
for a 10 meter portable amp? The high drive would make it a bit more legal
too, wouldn't it? (dunno, just curious)


Bipolars are better for higher drive, but the more efficient setup
would be an FET amp with a low-power exciter.

Frank Gilliland wrote:
On 20 Sep 2006 01:13:01 GMT, Steveo wrote in
:

Frank Gilliland wrote:
On 20 Sep 2006 00:26:10 GMT, Steveo wrote in
:

Frank Gilliland wrote:
Enough of that cheap one-board crap..... this amp is MODULAR!

Cool. How about a high drive portable to go behind an HF rig?
Variable input 25/100w.

The intent is to drive this from a stock CB, but if you want scale it
up then it's an easy design modification to the input module. I can
include that as an option in the design. However, know that if FET's
are used for power transistors then most of your 25/100 watt drive
would be wasted.

Are FET's the most economical transistors, or are are there other
choices for a 10 meter portable amp? The high drive would make it a bit
more legal too, wouldn't it? (dunno, just curious)

Bipolars are better for higher drive, but the more efficient setup
would be an FET amp with a low-power exciter.

Gotcha. What about the legal part of the question?

On 20 Sep 2006 01:23:28 GMT, Steveo wrote in
:

Frank Gilliland wrote:
On 20 Sep 2006 01:13:01 GMT, Steveo wrote in
:

Frank Gilliland wrote:
On 20 Sep 2006 00:26:10 GMT, Steveo wrote in
:

Frank Gilliland wrote:
Enough of that cheap one-board crap..... this amp is MODULAR!

Cool. How about a high drive portable to go behind an HF rig?
Variable input 25/100w.

The intent is to drive this from a stock CB, but if you want scale it
up then it's an easy design modification to the input module. I can
include that as an option in the design. However, know that if FET's
are used for power transistors then most of your 25/100 watt drive
would be wasted.

Are FET's the most economical transistors, or are are there other
choices for a 10 meter portable amp? The high drive would make it a bit
more legal too, wouldn't it? (dunno, just curious)

Bipolars are better for higher drive, but the more efficient setup
would be an FET amp with a low-power exciter.

Gotcha. What about the legal part of the question?


What about it?

Frank Gilliland wrote:
On 20 Sep 2006 01:23:28 GMT, Steveo wrote in
:

Frank Gilliland wrote:
On 20 Sep 2006 01:13:01 GMT, Steveo wrote in
:

Frank Gilliland wrote:
On 20 Sep 2006 00:26:10 GMT, Steveo wrote
in :

Frank Gilliland wrote:
Enough of that cheap one-board crap..... this amp is MODULAR!

Cool. How about a high drive portable to go behind an HF rig?
Variable input 25/100w.

The intent is to drive this from a stock CB, but if you want scale
it up then it's an easy design modification to the input module. I
can include that as an option in the design. However, know that if
FET's are used for power transistors then most of your 25/100 watt
drive would be wasted.

Are FET's the most economical transistors, or are are there other
choices for a 10 meter portable amp? The high drive would make it a
bit more legal too, wouldn't it? (dunno, just curious)

Bipolars are better for higher drive, but the more efficient setup
would be an FET amp with a low-power exciter.

Gotcha. What about the legal part of the question?

What about it?

Does the 25 watt -in- requirement make it anymore legal, or no? ( I really
don't know)

On 20 Sep 2006 01:30:33 GMT, Steveo wrote in
:

snip
Does the 25 watt -in- requirement make it anymore legal, or no? ( I really
don't know)


A ham could probably confirm this, but I think the minimum is 50 watts
input (with a license, of course..... without one it's no more legal
than having 5 watts input). Regarding -compliance- with the law, just
follow the leadership example set by our president and Congress.

Frank Gilliland wrote:
On 20 Sep 2006 01:30:33 GMT, Steveo wrote in
:

snip
Does the 25 watt -in- requirement make it anymore legal, or no? ( I
really don't know)

A ham could probably confirm this, but I think the minimum is 50 watts
input (with a license, of course.

Well yeah a guy is supposed to know CW to transmit voice on 10 meters...of
course. (I thought it was 25w or maybe they've up'd it since then?)

.... without one it's no more legal

Right, and a legal one would be a whole lot easier to advertise so the
bottom line should be better. (just throwing my two cents in fwiw)

than having 5 watts input). Regarding -compliance- with the law, just
follow the leadership example set by our president and Congress.

Do I have to? That's nasty.

On 20 Sep 2006 01:49:32 GMT, Steveo wrote in
:

snip
than having 5 watts input). Regarding -compliance- with the law, just
follow the leadership example set by our president and Congress.

Do I have to? That's nasty.


LOL!!!

On Tue, 19 Sep 2006 18:41:35 -0700, Frank Gilliland
wrote:

+++On 20 Sep 2006 01:30:33 GMT, Steveo wrote in
:
+++
+++snip
+++Does the 25 watt -in- requirement make it anymore legal, or no? ( I really
+++don't know)
+++
+++
+++A ham could probably confirm this, but I think the minimum is 50 watts
+++input (with a license, of course..... without one it's no more legal
+++than having 5 watts input). Regarding -compliance- with the law, just
+++follow the leadership example set by our president and Congress.
+++
+++
**********

The FCC does not actually place a power limitation on the drive.
Instead the specifiy the maximum gain of the amp at 15dB. So with 2KW
output that would correspond to about 60 watt drive.

james