For what it is worth there is a mod for AL-80B's to get rid of the "dynamic
bias circuit used to cut off the idle
current and reduce heat"

There was an apparent problem with the dynamic bias circuit introducing SSB
distortion. See URL:

http://ham.shineline.it/i3fue/mods-a-d/al80b.txt
Proceed at your own risk. Caveat Modifcatious !!
Remember most mods posted on the web are conjured up by Amateurs !!!

I bought my AL-80B used and it has this mod -- left it alone -- been
pouring out the Watts w/o a problem for 2 years now.

AL-80's were (still are ?) an Ameritron Design as far as I know. Affiliated
with MFJ somewhere along the line.
======================

Good tips...all of these. By the way, this is the worst schematic I have
ever seen on any piece of electronic equipment.
I take it that the 80A was built by another company which was bought by
MFJ.
I'm beginning to think we should convert this amp to an 80A even if the
active bias ckt is not the culprit here.

Thanks,
Snip

For what it is worth there is a mod for AL-80B's to get rid of the "dynamic
bias circuit used to cut off the idle
current and reduce heat"

There was an apparent problem with the dynamic bias circuit introducing SSB
distortion. See URL:

http://ham.shineline.it/i3fue/mods-a-d/al80b.txt
Proceed at your own risk. Caveat Modifcatious !!
Remember most mods posted on the web are conjured up by Amateurs !!!

I bought my AL-80B used and it has this mod -- left it alone -- been
pouring out the Watts w/o a problem for 2 years now.

AL-80's were (still are ?) an Ameritron Design as far as I know. Affiliated
with MFJ somewhere along the line.
======================

Good tips...all of these. By the way, this is the worst schematic I have
ever seen on any piece of electronic equipment.
I take it that the 80A was built by another company which was bought by
MFJ.
I'm beginning to think we should convert this amp to an 80A even if the
active bias ckt is not the culprit here.

Thanks,
Snip

(Andrew VK3BFA) wrote in message

Wow, I wonder if we are talking about the same thing here - what I was
refering to was the bunch of lids starting their scheduled net (which
the rest of the world should know about anyway, after all its "Their "
frequency ) all running high power with the rf gain wound right back
and not even noticing that they are QRM ing people underneath them
-and these same lids then get really ****ed off when someone with more
power does it to them. You arent one of these people are you?

I doubt it. I don't do nets.

- the
ones I was speciffically reffering to were about 2 years ago (the most
noticeable) when I was operating portable on 80m in the middle of a
forrest in the middle of winter (bloody freezing cold and wet,
operating QRP) during a safety net for a car rally and two Americans
came up and started their QSO - no way they could hear anyone under
them, and I dont think it would have made any difference to them
anyway. We couldnt QSY as the QRO guys didnt leave breaks, just kept
on yakking for hours and hours and hours........ dont ya just love
em....

If you were using the freq first, then yes, they were lids. But also,
you did most likely have a puny signal if you ran QRP on 80m. They
might not have heard you with the rf gain full up. Did they actually
say they had the gain rolled back?

But hey, this is the way it is - in psychology its called the "law of
comparative advantage" - If I have a big SUV then those nasty little
foreign cars wont bother me when I hit them - but eventually these
drivers get a big SUV as well so eventually everyone is stuck in
traffic driving gas guzzling trucks going nowhere. Same applies to QRO
- if nobody used it, then maybe, just maybe, no one would need it.

Probably so. I don't need it. I have good antennas. But you are going
to have to expect things like that when running a peanut whistle on
75m. I wouldn't lose much sleep over it.

BTW - whats the radiated power adjacent channel from a amplifier
putting out 1300 watts - assuming its well designed and has -35
supprseeion (sorry, cant think of the right word here...or the right
spelling....)

Dunno, not sure the question you are asking. MK

(Andrew VK3BFA) wrote in message

Wow, I wonder if we are talking about the same thing here - what I was
refering to was the bunch of lids starting their scheduled net (which
the rest of the world should know about anyway, after all its "Their "
frequency ) all running high power with the rf gain wound right back
and not even noticing that they are QRM ing people underneath them
-and these same lids then get really ****ed off when someone with more
power does it to them. You arent one of these people are you?

I doubt it. I don't do nets.

- the
ones I was speciffically reffering to were about 2 years ago (the most
noticeable) when I was operating portable on 80m in the middle of a
forrest in the middle of winter (bloody freezing cold and wet,
operating QRP) during a safety net for a car rally and two Americans
came up and started their QSO - no way they could hear anyone under
them, and I dont think it would have made any difference to them
anyway. We couldnt QSY as the QRO guys didnt leave breaks, just kept
on yakking for hours and hours and hours........ dont ya just love
em....

If you were using the freq first, then yes, they were lids. But also,
you did most likely have a puny signal if you ran QRP on 80m. They
might not have heard you with the rf gain full up. Did they actually
say they had the gain rolled back?

But hey, this is the way it is - in psychology its called the "law of
comparative advantage" - If I have a big SUV then those nasty little
foreign cars wont bother me when I hit them - but eventually these
drivers get a big SUV as well so eventually everyone is stuck in
traffic driving gas guzzling trucks going nowhere. Same applies to QRO
- if nobody used it, then maybe, just maybe, no one would need it.

Probably so. I don't need it. I have good antennas. But you are going
to have to expect things like that when running a peanut whistle on
75m. I wouldn't lose much sleep over it.

BTW - whats the radiated power adjacent channel from a amplifier
putting out 1300 watts - assuming its well designed and has -35
supprseeion (sorry, cant think of the right word here...or the right
spelling....)

Dunno, not sure the question you are asking. MK

"Mark Keith" wrote in message
om...
(Andrew VK3BFA) wrote in message

Wow, I wonder if we are talking about the same thing here - what I was
refering to was the bunch of lids starting their scheduled net (which
the rest of the world should know about anyway, after all its "Their "
frequency ) all running high power with the rf gain wound right back
and not even noticing that they are QRM ing people underneath them
-and these same lids then get really ****ed off when someone with more
power does it to them. You arent one of these people are you?

I doubt it. I don't do nets.

- the
ones I was speciffically reffering to were about 2 years ago (the most
noticeable) when I was operating portable on 80m in the middle of a
forrest in the middle of winter (bloody freezing cold and wet,
operating QRP) during a safety net for a car rally and two Americans
came up and started their QSO - no way they could hear anyone under
them, and I dont think it would have made any difference to them
anyway. We couldnt QSY as the QRO guys didnt leave breaks, just kept
on yakking for hours and hours and hours........ dont ya just love
em....

If you were using the freq first, then yes, they were lids. But also,
you did most likely have a puny signal if you ran QRP on 80m. They
might not have heard you with the rf gain full up. Did they actually
say they had the gain rolled back?

But hey, this is the way it is - in psychology its called the "law of
comparative advantage" - If I have a big SUV then those nasty little
foreign cars wont bother me when I hit them - but eventually these
drivers get a big SUV as well so eventually everyone is stuck in
traffic driving gas guzzling trucks going nowhere. Same applies to QRO
- if nobody used it, then maybe, just maybe, no one would need it.

Probably so. I don't need it. I have good antennas. But you are going
to have to expect things like that when running a peanut whistle on
75m. I wouldn't lose much sleep over it.

BTW - whats the radiated power adjacent channel from a amplifier
putting out 1300 watts - assuming its well designed and has -35
supprseeion (sorry, cant think of the right word here...or the right
spelling....)

Dunno, not sure the question you are asking. MK

Only way to run QRP on 80m is in the dead of winter at 2-3am in the morning.
Most of the time QRP on 80 means 400 watts output.

Dan/W4NTI

"Mark Keith" wrote in message
om...
(Andrew VK3BFA) wrote in message

Wow, I wonder if we are talking about the same thing here - what I was
refering to was the bunch of lids starting their scheduled net (which
the rest of the world should know about anyway, after all its "Their "
frequency ) all running high power with the rf gain wound right back
and not even noticing that they are QRM ing people underneath them
-and these same lids then get really ****ed off when someone with more
power does it to them. You arent one of these people are you?

I doubt it. I don't do nets.

- the
ones I was speciffically reffering to were about 2 years ago (the most
noticeable) when I was operating portable on 80m in the middle of a
forrest in the middle of winter (bloody freezing cold and wet,
operating QRP) during a safety net for a car rally and two Americans
came up and started their QSO - no way they could hear anyone under
them, and I dont think it would have made any difference to them
anyway. We couldnt QSY as the QRO guys didnt leave breaks, just kept
on yakking for hours and hours and hours........ dont ya just love
em....

If you were using the freq first, then yes, they were lids. But also,
you did most likely have a puny signal if you ran QRP on 80m. They
might not have heard you with the rf gain full up. Did they actually
say they had the gain rolled back?

But hey, this is the way it is - in psychology its called the "law of
comparative advantage" - If I have a big SUV then those nasty little
foreign cars wont bother me when I hit them - but eventually these
drivers get a big SUV as well so eventually everyone is stuck in
traffic driving gas guzzling trucks going nowhere. Same applies to QRO
- if nobody used it, then maybe, just maybe, no one would need it.

Probably so. I don't need it. I have good antennas. But you are going
to have to expect things like that when running a peanut whistle on
75m. I wouldn't lose much sleep over it.

BTW - whats the radiated power adjacent channel from a amplifier
putting out 1300 watts - assuming its well designed and has -35
supprseeion (sorry, cant think of the right word here...or the right
spelling....)

Dunno, not sure the question you are asking. MK

Only way to run QRP on 80m is in the dead of winter at 2-3am in the morning.
Most of the time QRP on 80 means 400 watts output.

Dan/W4NTI

Seventy five meters sounds like CB these days. I don't bother going there
any longer.

Ed, NM2K

"Dan/W4NTI" wrote in message
...

"Mark Keith" wrote in message
om...
(Andrew VK3BFA) wrote in message

Wow, I wonder if we are talking about the same thing here - what I was
refering to was the bunch of lids starting their scheduled net (which
the rest of the world should know about anyway, after all its "Their "
frequency ) all running high power with the rf gain wound right back
and not even noticing that they are QRM ing people underneath them
-and these same lids then get really ****ed off when someone with more
power does it to them. You arent one of these people are you?

I doubt it. I don't do nets.

- the
ones I was speciffically reffering to were about 2 years ago (the most
noticeable) when I was operating portable on 80m in the middle of a
forrest in the middle of winter (bloody freezing cold and wet,
operating QRP) during a safety net for a car rally and two Americans
came up and started their QSO - no way they could hear anyone under
them, and I dont think it would have made any difference to them
anyway. We couldnt QSY as the QRO guys didnt leave breaks, just kept
on yakking for hours and hours and hours........ dont ya just love
em....

If you were using the freq first, then yes, they were lids. But also,
you did most likely have a puny signal if you ran QRP on 80m. They
might not have heard you with the rf gain full up. Did they actually
say they had the gain rolled back?

But hey, this is the way it is - in psychology its called the "law of
comparative advantage" - If I have a big SUV then those nasty little
foreign cars wont bother me when I hit them - but eventually these
drivers get a big SUV as well so eventually everyone is stuck in
traffic driving gas guzzling trucks going nowhere. Same applies to QRO
- if nobody used it, then maybe, just maybe, no one would need it.

Probably so. I don't need it. I have good antennas. But you are going
to have to expect things like that when running a peanut whistle on
75m. I wouldn't lose much sleep over it.

BTW - whats the radiated power adjacent channel from a amplifier
putting out 1300 watts - assuming its well designed and has -35
supprseeion (sorry, cant think of the right word here...or the right
spelling....)

Dunno, not sure the question you are asking. MK

Only way to run QRP on 80m is in the dead of winter at 2-3am in the
morning.
Most of the time QRP on 80 means 400 watts output.

Dan/W4NTI

Seventy five meters sounds like CB these days. I don't bother going there
any longer.

Ed, NM2K

"Dan/W4NTI" wrote in message
...

"Mark Keith" wrote in message
om...
(Andrew VK3BFA) wrote in message

Wow, I wonder if we are talking about the same thing here - what I was
refering to was the bunch of lids starting their scheduled net (which
the rest of the world should know about anyway, after all its "Their "
frequency ) all running high power with the rf gain wound right back
and not even noticing that they are QRM ing people underneath them
-and these same lids then get really ****ed off when someone with more
power does it to them. You arent one of these people are you?

I doubt it. I don't do nets.

- the
ones I was speciffically reffering to were about 2 years ago (the most
noticeable) when I was operating portable on 80m in the middle of a
forrest in the middle of winter (bloody freezing cold and wet,
operating QRP) during a safety net for a car rally and two Americans
came up and started their QSO - no way they could hear anyone under
them, and I dont think it would have made any difference to them
anyway. We couldnt QSY as the QRO guys didnt leave breaks, just kept
on yakking for hours and hours and hours........ dont ya just love
em....

If you were using the freq first, then yes, they were lids. But also,
you did most likely have a puny signal if you ran QRP on 80m. They
might not have heard you with the rf gain full up. Did they actually
say they had the gain rolled back?

But hey, this is the way it is - in psychology its called the "law of
comparative advantage" - If I have a big SUV then those nasty little
foreign cars wont bother me when I hit them - but eventually these
drivers get a big SUV as well so eventually everyone is stuck in
traffic driving gas guzzling trucks going nowhere. Same applies to QRO
- if nobody used it, then maybe, just maybe, no one would need it.

Probably so. I don't need it. I have good antennas. But you are going
to have to expect things like that when running a peanut whistle on
75m. I wouldn't lose much sleep over it.

BTW - whats the radiated power adjacent channel from a amplifier
putting out 1300 watts - assuming its well designed and has -35
supprseeion (sorry, cant think of the right word here...or the right
spelling....)

Dunno, not sure the question you are asking. MK

Only way to run QRP on 80m is in the dead of winter at 2-3am in the
morning.
Most of the time QRP on 80 means 400 watts output.

Dan/W4NTI