ks.
>
> Brian VE3GMZ
>
>
>
> Sent via BlackBerry Hub+ Inbox for Android
>
>
> Original Message
>
>
> From: a.dur...@msn.com
> Sent: April 5, 2020 1:05 p.m.
> To: elecraft@mailman.qth.net
> Subject: [Elecraft] Max power for JT9 with K3S 100?
>
>
&g
.
Again, thanks.
Brian VE3GMZ
Sent via BlackBerry Hub+ Inbox for Android
Original Message
From: a.dur...@msn.com
Sent: April 5, 2020 1:05 p.m.
To: elecraft@mailman.qth.net
Subject: [Elecraft] Max power for JT9 with K3S 100?
"With high power is it your practice to start with
"With high power is it your practice to start with lower levels and work your
way up or do you go for broke from the start?"
For FT8 I make the initial call with the power that I think is required for the
propagation path. If the station replies I may increase or reduce power based
on their
Yes it matters. The short version is that your receiving ability may exceed
that of the other stations noise floor.
Just because my noise floor is generally -130 or quieter doesn’t mean their
noise is equally quiet. If they can’t reduce noise further, you need to
present more signal.
With
4-04 8:19 p.m. (GMT-05:00)
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] Max power for JT9 with K3S 100?
>
> Frank et al;
>
>
> Just quoted what is in the K3S manual. No interpretation provided. I
> agree that 100 watts key down is a lot for a SSB amplif
.
To: brianchapn...@rogers.com
Cc: rmcg...@blomand.net; Elecraft@mailman.qth.net
Subject: Re: [Elecraft] Max power for JT9 with K3S 100?
Because it’s weak signal at the receiving end; you use what power it takes to
succeed in making the contact, up to the legal limit.
On 160M, 1500 watts out is common
p.m. (GMT-05:00) To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Max power for JT9 with K3S 100? Frank et al;Just quoted what is in the K3S manual. No interpretation provided. I agree that 100 watts key down is a lot for a SSB amplifier running in CW mode. To me that says 100 watts
On 4/4/2020 9:01 PM, brianchapnick wrote:
This discussion fascinates me only in that I wonder why you are using so much
power for weak signal modes? 5 or 10 watts should be plenty even with a
compromised antenna and poor band conditions..or am I missing somthing.
Yes. "Weak signal" does
Original message From: Bob McGraw K4TAX
> Date: 2020-04-04 8:19 p.m. (GMT-05:00) To:
> elecraft@mailman.qth.net Subject: Re: [Elecraft] Max power for JT9 with K3S
> 100? Frank et al;Just quoted what is in the K3S manual. No interpretation
> provided. I agree
message From: Bob McGraw K4TAX
Date: 2020-04-04 8:19 p.m. (GMT-05:00) To: elecraft@mailman.qth.net Subject:
Re: [Elecraft] Max power for JT9 with K3S 100? Frank et al;Just quoted what is
in the K3S manual. No interpretation provided. I agree that 100 watts key
down is a lot
Frank et al;
Just quoted what is in the K3S manual. No interpretation provided. I
agree that 100 watts key down is a lot for a SSB amplifier running in CW
mode. To me that says 100 watts for 10 minutes and then RX for 10
minutes. Otherwise equal TX and RX times. Who does that?
Running FT-8 or PSK-31, I see 60 C from time to time. Some bands I see
the temp rise much faster indicating less efficiency.
73
Bob, K4TAX
On 4/4/2020 5:03 PM, Dave Cole wrote:
What is the recommended temp to run the KPA500 at?
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL
Andy et al;
Just quoted what is in the K3S manual. No interpretation provided. I
agree that 100 watts key down is a lot for a SSB amplifier running in CW
mode. To me that says 100 watts for 10 minutes and then RX for 10
minutes. Otherwise equal TX and RX times. Who does that?
I
What is the recommended temp to run the KPA500 at?
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources
On 4/4/20 3:01 PM, Andy Durbin wrote:
"Does "100% - 10 min, 100 W key-down" mean that if
"Does "100% - 10 min, 100 W key-down" mean that if you key down without stop in
CW mode it can go 10 minutes at 100 watts? That seems like an awful lot."
If you want to know what it actually means you'd probably have to run a test
and record the PA temperature. Does it reach maximum value
Thanks for the replies.
I've enabled the PA temp display (currently showing 22C right after
power-up but before transmitting), and will keep an eye on that.
Bob, I noticed that line in the K3S manual about the CW/SSB duty cycle.
Does "100% - 10 min, 100 W key-down" mean that if you key down
Fred Cady's book:
"There are four fans speeds that turn on at different temperatures."
"If the temperature reaches 84 degrees C the KPA3 will be bypassed until
the temperature falls to stop any damage as a last-ditch backup measure
to protect your expensive power transistors from the excess
Frank:
The duty cycle for the transmitter, as stated in the manual, is; CW and
SSB modes, 100% - 10 min, 100 W key-down at 25C ambient. Do note that
6M has reduce power values of 85 watts {51 -52 MHz} or 70 watts {52 - 54
MHz}
The duty cycle for JT-9, 1 minute transmit, 1 minute receive
I've been using JT9 mode on 630m this winter with my K3S outputting to
an external class D amp.
Now I'm interested in trying some JT9 QSOs with some people currently
operating on 160m. For me this would mean outputting directly from the
K3S (with internal tuner) to the antenna.
Given the
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