The PA power/efficiency thread has been a great one to read guys, I
haven't commented much because real-life/work stuff went nuts the last
couple of days.
But a quick "thank you" to all of you who tried to convert your
knowledge of the topic into readable, usable, plain-english
explanation
epeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Repeater Transmitter matching
> What Jeff recommends is adjusting the
> impedance matching
> device and/or the power setting so as to optimize the
> efficiency. In other
> words, get more power to the antenna and reduce the amount
> What Jeff recommends is adjusting the
> impedance matching
> device and/or the power setting so as to optimize the
> efficiency. In other
> words, get more power to the antenna and reduce the amount of internal
> heating. It may turn out that the point of optimum efficiency
> is not at the
> r
Nate Duehr wrote:
> Turning them down (as we've all noted previously) does NOT always mean
> that they run cooler due to the aforementioned inefficiency "built in"
> to them, so to speak. We've all seen that one with an IR temperature
> measuring device pointed at the heatsink and/or power tran
groups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Nate Duehr
Sent: Thursday, June 25, 2009 11:51 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Repeater Transmitter matching
Jeff DePolo wrote:
> The changes that occur are at source end inside the PA. The
Jeff DePolo wrote:
> The changes that occur are at source end inside the PA. The ideal load Z
> for the output devices changes when you vary the output power. If you
> "tune" the Z-matcher to present a load Z to the devices that results in them
> operating at maximum efficiency at at 100 watts, an
At 6/25/2009 12:10, you wrote:
>That kinda surprises me... how does changing power level affect the match?!
The characteristics of the class C RFPA change, in particular the duty
cycle. My guess is that as the power output is decreased, the output
impedance of the final transistor would go up
mailto:repeater-buil...@yahoogroups.com] On Behalf Of Nate Duehr
> Sent: Thursday, June 25, 2009 3:10 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: RE: [Repeater-Builder] Repeater Transmitter matching
>
>
>
> That kinda surprises me... how does changing power le
That kinda surprises me... how does changing power level affect
the match?!
(Not saying I don't believe you Jeff... I know you've probably
tested it six ways from sideways... I'm just wondering "Why?"
What am I missing here...?)
--
Nate Duehr, WY0X
n...@natetech.com
On Thu, 25 Jun 2009 11:05
> Have you found that adjustments of power level output of the
> MastrII PA
> has required much retuning of the Z-matcher? I have a plan that may
> drop power output during power failures and I'm wondering how the
> z-matcher might affect things.
Yes, the match will vary as output power is var
ximum PA efficiency at the desired power output
> level.
>
> --- Jeff WN3A
>
>
>
>> -Original Message-
>> From: Repeater-Builder@yahoogroups.com
>> [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Joe
>> Sent: Thursday, June
d power output
level.
--- Jeff WN3A
> -Original Message-
> From: Repeater-Builder@yahoogroups.com
> [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Joe
> Sent: Thursday, June 25, 2009 9:37 AM
> To: Repeater-Builder@yahoogroups.com
> Subject: [Repeater-
I was looking around on the Telewave site and found transmitter matchers
as shown below. I wonder if anyone has used one on a repeater, such as
the GE MastrII?
73, Joe, K1ike
MODEL
DESCRIPTION
FREQ. RANGE
TX POWER
LIST PRICE
TZM-50
E-Z Match - Trans
13 matches
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