As far as I know, the older MP1K's output problems with class A are not
represented in the 5K series. Is there data proving the case otherwise?
73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie
-----Original Message-----
From: K6YE - TOMMY
Sent: Saturday, May 23, 2015 11:41 PM
To: Charles Henry ; amps@contesting.com
Subject: Re: [Amps] Real danger to use the ORANGE button
Charles, ET AL,
I have run my FTDX-5000MP into an Alpha 91-B, at 35 watts, using Class A for
years with no problems. Am I missing something or is the problem confined to
76PA amps.
Semper Fi,
Tommy - K6YE
DX IS and CW RULES
----- Original Message -----
From: Charles Henry <k4vud@hotmail.com>
To: Jeff AC0C <keepwalking188@ac0c.com>, amps@contesting.com, Contest
Internet <cq-contest@contesting.com>
Sent: Sun, 24 May 2015 00:17:19 -0400 (EDT)
Subject: [Amps] Real danger to use the ORANGE button
URGENT to all Yaesu radio owners with the orange Class A button.
ABSOLUTELY DO NOT RUN THOSE RADIOS AT LESS THAN FULL POWER OUTPUT SETTING.
I ran a FT-1000Mark 5 into an Alpha 76pac with Class A turned on and at
about 50 watts of drive.
That adjustment resulted is burning up the Yaesu radio so badly no one could
fix it; not even Yaesu England. Do not run Class A at any setting below
full RF power with power knob fully clockwise!
The FT-5000/9000 can adjust somewhere between AB and full Class A. I do not
know about that situation.
Otherwise, lets hear some crowing about Yaesu Class A transceivers to go
with the crowing K3 Lovers Club, eh? 73, Charly
From: keepwalking188@ac0c.com
To: k4vud@hotmail.com; amps@contesting.com; cq-contest@contesting.com
Subject: Re: [Amps] Why not use the ORANGE button?
Date: Sat, 23 May 2015 21:34:34 -0500
In class A, the 3rd harmonic content is somewhat less, and the higher
order
products are way down. Without that feature enabled (the usual AB), the
3rd
is stronger and all of the usual higher order products are present and
strong. I normally drive my Alpha 76PA with the 5K in class A at about
60W.
The output signal is nice and crisp with that combo.
73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie
-----Original Message-----
From: Charles Henry
Sent: Saturday, May 23, 2015 8:37 PM
To: amps@contesting.com ; Contest Internet
Subject: [Amps] Why not use the ORANGE button?
I see extoling comments re K3 clean xmitter. What about the Yaesu
transceivers with the ORANGE button (some call it red)? Any Yaesu owner
has
stepped up to the plate and said he just uses his orange button on (ALWAYS
at full power, max RF power knob fully clockwise).... and explains and
extolls that strategy to put out cleaner signals???
Someone, please just state how much the orange button Yaesu-s help,
preferably compared to the K3.
Thanks mucho,
73, Charly
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