What happened to the SkyWave 2879ABTC?
 

msg wrote:

...
Hmmm... a discussion about the biasing of an RF amplifier is not
relevant to this NG huh?
Find another outlet for your complaints... lol

Please quit cross posting this to 'rec.radio.amateur.homebrew';
this _clearly_ is not a homebrewing discussion.

Regards,

Michael

Strange!

Have you guys now taken up knitting and crocheting?

Hmmm. I liked it better when you actually discussed electronic circuits!

JS

What happened to the SkyWave 2879ABTC?
 

On Mon, 24 Sep 2007 02:52:47 -0700, Telspam Electronics
wrote in
.com:

On Sep 24, 4:35 am, Frank Gilliland
wrote:
I checked the page again thinking maybe it changed, but I still don't
see two diodes. Just one. What two diodes are -you- seeing, Brian?- Hide quoted text -

You're kidding me right?... the external tracking diode (one) and the
base-emitter diode of the power transistor (two). Got it?


So you claim it doesn't work because one diode will "hog" the current?
Well, that's the point! D1 "hogs" the current and establishes a fixed
voltage for the base of TR1!!! But alas, it only works if your ground
plane is 9 square feet.......

So where's that schematic, Brian?

What happened to the SkyWave 2879ABTC?
 

On Sep 24, 2:42 pm, Frank Gilliland
wrote:
So you claim it doesn't work because one diode will "hog" the current?
Well, that's the point! D1 "hogs" the current and establishes a fixed
voltage for the base of TR1!!!

As usual Frank you are missing the important point here. That point
being that you can't simply parallel two diodes... and have them share
currents. This would have to be done in order for any tracking between
the two. The problem is that one diode will always turn on before the
other... and take all current. Now I ask you... where is the sharing/
tracking in that scenario? The answer is: there is no sharing/
tracking... because one diode with the lowest drop will hog the entire
current... and the other diode will be off. this is why the gentleman
on the web page link that YOU provided says it that scheme works like
crap. He's absolutely right!
www.telstar-electronics.com

What happened to the SkyWave 2879ABTC?
 

On Tue, 25 Sep 2007 05:43:22 -0700, Telspam Electronics
wrote in
.com:

On Sep 24, 2:42 pm, Frank Gilliland
wrote:
So you claim it doesn't work because one diode will "hog" the current?
Well, that's the point! D1 "hogs" the current and establishes a fixed
voltage for the base of TR1!!!

As usual Frank you are missing the important point here. That point
being that you can't simply parallel two diodes... and have them share
currents. This would have to be done in order for any tracking between
the two. The problem is that one diode will always turn on before the
other... and take all current. Now I ask you... where is the sharing/
tracking in that scenario? The answer is: there is no sharing/
tracking... because one diode with the lowest drop will hog the entire
current... and the other diode will be off.


Amazing. Two major bungles within one month. First you couldn't
recognize a simple voltage multiplier, and now you show that you can't
even understand the basic principle of diode biasing of a transistor.


this is why the gentleman
on the web page link that YOU provided says it that scheme works like
crap. He's absolutely right!


Funny..... he gives a different explanation.

BTW, where's that schematic, Brian?

What happened to the SkyWave 2879ABTC?
 

On Sep 25, 8:42 am, Frank Gilliland
wrote:
Amazing. Two major bungles within one month. First you couldn't
recognize a simple voltage multiplier, and now you show that you can't
even understand the basic principle of diode biasing of a transistor.

Frank, again you resort to degrading statements in an attempt to shift
the focus and avoid the topic.
You have suceeded... end of conversation with you.
www.telstar-electronics.com

What happened to the SkyWave 2879ABTC?
 

On Tue, 25 Sep 2007 05:43:22 -0700, Telstar Electronics
wrote:

|On Sep 24, 2:42 pm, Frank Gilliland
|wrote:
| So you claim it doesn't work because one diode will "hog" the current?
| Well, that's the point! D1 "hogs" the current and establishes a fixed
| voltage for the base of TR1!!!
|
|As usual Frank you are missing the important point here. That point
|being that you can't simply parallel two diodes... and have them share
|currents. This would have to be done in order for any tracking between
|the two. The problem is that one diode will always turn on before the
|other... and take all current. Now I ask you... where is the sharing/
|tracking in that scenario? The answer is: there is no sharing/
|tracking... because one diode with the lowest drop will hog the entire
|current... and the other diode will be off. this is why the gentleman
|on the web page link that YOU provided says it that scheme works like
|crap. He's absolutely right!
|www.telstar-electronics.com
|
|-------------


Bovine excrement. Ever heard of equalizing of current through a series
resistance? Often called a ballast resistor. Used quite often in power
transistors where there are several base/emiter pn jumctions.

james

What happened to the SkyWave 2879ABTC?
 

On Tue, 25 Sep 2007 07:08:51 -0700, Telstar Electronics
wrote:

|On Sep 25, 8:42 am, Frank Gilliland
|wrote:
| Amazing. Two major bungles within one month. First you couldn't
| recognize a simple voltage multiplier, and now you show that you can't
| even understand the basic principle of diode biasing of a transistor.
|
|Frank, again you resort to degrading statements in an attempt to shift
|the focus and avoid the topic.
|You have suceeded... end of conversation with you.
|www.telstar-electronics.com
|-------------

No Brian

He is quite on topic. You are failing to comprehend a very simple
basic understanding of the biasing of a transistor.

james

What happened to the SkyWave 2879ABTC?
 

On Tue, 25 Sep 2007 07:08:51 -0700, Telspam Electronics
wrote in
om:

On Sep 25, 8:42 am, Frank Gilliland
wrote:
Amazing. Two major bungles within one month. First you couldn't
recognize a simple voltage multiplier, and now you show that you can't
even understand the basic principle of diode biasing of a transistor.

Frank, again you resort to degrading statements in an attempt to shift
the focus and avoid the topic.


The topic is the concept of using a diode to bias a transistor, a
concept understood by any first-year electronics student.

But not you.

The BE junction stays at or above quiescient current BECAUSE the diode
is hogging the current. It even says that in the article (that you
obviously didn't understand).

Two diodes..... sheesh..... I'll bet you've never seen a Vbe curve,
either.


You have suceeded... end of conversation with you.


Well, since that's the closest thing to an admission of ignorance that
you are capable of, I'll take all nine square feet...... ROTFLMMFAO!!!

What happened to the SkyWave 2879ABTC?
 

On Sep 25, 9:37 am, james wrote:
Bovine excrement. Ever heard of equalizing of current through a series
resistance? Often called a ballast resistor. Used quite often in power
transistors where there are several base/emiter pn jumctions.

OK James... less not discuss ballasting... because that has no bearing
in this particular discussion. Maybe you can tell us how the diode
method of biasing shown at http://www.ifwtech.co.uk/g3sek/tr-bias/tr-bias1.htm
(bad circuits section) works. And since you think that circuit works
well. Please tell us why.
www.telstar-electronics.com

What happened to the SkyWave 2879ABTC?
 

On Tue, 25 Sep 2007 08:09:50 -0700, Telspam Electronics
wrote in
. com:

On Sep 25, 9:37 am, james wrote:
Bovine excrement. Ever heard of equalizing of current through a series
resistance? Often called a ballast resistor. Used quite often in power
transistors where there are several base/emiter pn jumctions.

OK James... less not discuss ballasting... because that has no bearing
in this particular discussion. Maybe you can tell us how the diode
method of biasing shown at http://www.ifwtech.co.uk/g3sek/tr-bias/tr-bias1.htm
(bad circuits section) works.


Holy ****..... Brian flunked first-year techie school!!!!