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To : PSK31@WW.SYD.NSW.AUS.OC
De: Psk31 Digest <owner-psk31@aintel.bi.ehu.es>
Para: <psk31-digest@aintel.bi.ehu.es>
Asunto: Psk31 Digest V1 #198
Fecha: domingo 10 de octubre de 1999 4:36
Psk31 Digest Sunday, October 10 1999 Volume 01 : Number 198
In this issue:
[psk31] Psk31duty cycle
Re: [psk31] Psk31duty cycle
Re: [psk31] Psk31duty cycle
Re: [psk31] Psk31duty cycle
Re: [psk31] Psk31duty cycle
See the end of the digest for information about psk31-digest
----------------------------------------------------------------------
Date: Sat, 09 Oct 1999 06:24:25 -0400
From: Charles Greene <cgreene@loa.com>
Subject: [psk31] Psk31duty cycle
What is the duty cycle of PSK31 when sending
ordinary text? RTTY is 100%. I am build an
Elecraft K2 and it is rated at 15 watts at a
50% duty cycle, and I don't want to over stress
it.
____________
Try PSK31. Check: http://aintel.bi.ehu.es/psk31.html
and May 99 QST.
Chas, W1CG
Rhode Island TCPIP Address Coordinator
w1cg@arrl.net
_____________
------------------------------
Date: Sat, 09 Oct 1999 11:29:29 -0500
From: "George T. Baker" <w5yr@swbell.net>
Subject: Re: [psk31] Psk31duty cycle
Charles, when PSK31 is in IDLE mode, it outputs a two-tone signal whose
average power is 50% of the peak or "key down" power. So at those times -
whenever you aren't sending a keyboard character - the duty cycle is 50%.
The average duty cycle during character transmission depends upon the
character sequence and the typing speed. I would guess that it is
probably in the order of 80%.
During the interval between characters, the two-tone is sent at 50% but
during a character, the peak power is involved. Maybe someone has done a
few measurements on this for "typical" text. For very slow typing the
IDLE condition would prevail most of the time and the duty cycle would
tend toward 50%. For very rapid typing the duty cycle would tend toward
100%. Since the character codes are of different lengths - unlike RTTY -
the character sequence also enters in.
I asked the K2 boys about this before they started shipping and they said
to limit the rig to 5 watts for PSK31 instead of 10 watts for cw, etc.
72/73, George AMA 98452 R/C since 1964
Amateur Radio W5YR, in the 54th year and it just keeps getting better!
AutoPOWER Systems, Fairview, TX (30 mi NE Dallas) Collin County
QRP-L QRP-ARCI FISTS NORCAL ZOMBIE ARS 10-X 33.2 N 96.6 W EM13RE
Charles Greene wrote:
>
> What is the duty cycle of PSK31 when sending
> ordinary text? RTTY is 100%. I am build an
> Elecraft K2 and it is rated at 15 watts at a
> 50% duty cycle, and I don't want to over stress
> it.
- --
72/73, George AMA 98452 R/C since 1964
Amateur Radio W5YR, in the 54th year and it just keeps getting better!
AutoPOWER Systems, Fairview, TX (30 mi NE Dallas) Collin County
QRP-L QRP-ARCI FISTS NORCAL ZOMBIE ARS 10-X 33.2 N 96.6 W EM13RE
------------------------------
Date: Sat, 09 Oct 1999 17:06:55 -0400
From: Charles Greene <cgreene@loa.com>
Subject: Re: [psk31] Psk31duty cycle
At 11:29 AM 10/9/99 -0500, George T. Baker wrote:
>Charles, when PSK31 is in IDLE mode, it outputs a two-tone signal whose
>average power is 50% of the peak or "key down" power. So at those times -
>whenever you aren't sending a keyboard character - the duty cycle is 50%.
That's interesting. I drive up my Ten-Tec Omni-VI to 80 to 90 watts on idle,
and I get excellent reports on the side band reduction. It is rated 100 watts
at 100% duty cycle, but it sure gets hot. I guess I'll have to
read up on two tone test signals in the ARRL handbook.
>
>The average duty cycle during character transmission depends upon the
>character sequence and the typing speed. I would guess that it is
>probably in the order of 80%.
I was going to estimate 80% too, but it seems that the signal goes down
as much as it goes up. I know that if I am using VOX, which I don't use
much, the rig will drop out of transmit on text unless I crank the VOX gain
up as high as I can, and set the VOX delay on max.
>
>During the interval between characters, the two-tone is sent at 50% but
>during a character, the peak power is involved. Maybe someone has done a
>few measurements on this for "typical" text. For very slow typing the
>IDLE condition would prevail most of the time and the duty cycle would
>tend toward 50%. For very rapid typing the duty cycle would tend toward
>100%. Since the character codes are of different lengths - unlike RTTY -
>the character sequence also enters in.
>
>I asked the K2 boys about this before they started shipping and they said
>to limit the rig to 5 watts for PSK31 instead of 10 watts for cw, etc.
They just changed the max of the rig from 10 to 15 watts, with the
caveat that you limit any mode to 50% duty cycle for powers
10 watts and over. That's why the question. I am not using
my K2 on psk31 because they have just started shipping
the SSB option, and I haven't gotten mine yet.
Well, tnx for the info George. I'll use it.
>
>72/73, George AMA 98452 R/C since 1964
>Amateur Radio W5YR, in the 54th year and it just keeps getting better!
>AutoPOWER Systems, Fairview, TX (30 mi NE Dallas) Collin County
>QRP-L QRP-ARCI FISTS NORCAL ZOMBIE ARS 10-X 33.2 N 96.6 W EM13RE
>
>
>Charles Greene wrote:
>>
>> What is the duty cycle of PSK31 when sending
>> ordinary text? RTTY is 100%. I am build an
>> Elecraft K2 and it is rated at 15 watts at a
>> 50% duty cycle, and I don't want to over stress
>> it.
------------------------------
Date: Sat, 09 Oct 1999 17:06:55 -0400
From: Charles Greene <cgreene@loa.com>
Subject: Re: [psk31] Psk31duty cycle
At 11:29 AM 10/9/99 -0500, George T. Baker wrote:
>Charles, when PSK31 is in IDLE mode, it outputs a two-tone signal whose
>average power is 50% of the peak or "key down" power. So at those times -
>whenever you aren't sending a keyboard character - the duty cycle is 50%.
That's interesting. I drive up my Ten-Tec Omni-VI to 80 to 90 watts on idle,
and I get excellent reports on the side band reduction. It is rated 100 watts
at 100% duty cycle, but it sure gets hot. I guess I'll have to
read up on two tone test signals in the ARRL handbook.
>
>The average duty cycle during character transmission depends upon the
>character sequence and the typing speed. I would guess that it is
>probably in the order of 80%.
I was going to estimate 80% too, but it seems that the signal goes down
as much as it goes up. I know that if I am using VOX, which I don't use
much, the rig will drop out of transmit on text unless I crank the VOX gain
up as high as I can, and set the VOX delay on max.
>
>During the interval between characters, the two-tone is sent at 50% but
>during a character, the peak power is involved. Maybe someone has done a
>few measurements on this for "typical" text. For very slow typing the
>IDLE condition would prevail most of the time and the duty cycle would
>tend toward 50%. For very rapid typing the duty cycle would tend toward
>100%. Since the character codes are of different lengths - unlike RTTY -
>the character sequence also enters in.
>
>I asked the K2 boys about this before they started shipping and they said
>to limit the rig to 5 watts for PSK31 instead of 10 watts for cw, etc.
They just changed the max of the rig from 10 to 15 watts, with the
caveat that you limit any mode to 50% duty cycle for powers
10 watts and over. That's why the question. I am not using
my K2 on psk31 because they have just started shipping
the SSB option, and I haven't gotten mine yet.
Well, tnx for the info George. I'll use it.
>
>72/73, George AMA 98452 R/C since 1964
>Amateur Radio W5YR, in the 54th year and it just keeps getting better!
>AutoPOWER Systems, Fairview, TX (30 mi NE Dallas) Collin County
>QRP-L QRP-ARCI FISTS NORCAL ZOMBIE ARS 10-X 33.2 N 96.6 W EM13RE
>
>
>Charles Greene wrote:
>>
>> What is the duty cycle of PSK31 when sending
>> ordinary text? RTTY is 100%. I am build an
>> Elecraft K2 and it is rated at 15 watts at a
>> 50% duty cycle, and I don't want to over stress
>> it.
------------------------------
Date: Sat, 09 Oct 1999 16:34:30 -0600
From: "Gary McDuffie, Sr." <mcduffie@scottsbluff.net>
Subject: Re: [psk31] Psk31duty cycle
On Sat, 09 Oct 1999 11:29:29 -0500, George T. Baker wrote:
> During the interval between characters, the two-tone is sent at 50%
This is an old subject, and I don't remember the final numbers.
However, I'd like to add a new question to it. Peter, or anyone else
who might know, what is the effect of poor quality signal? In other
words, I assume that the 50% figure is for a nearly perfectly clean
signal. What happens to the average power when the intermod numbers
drop from -35db or better down to only 15-20db?
Gary
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End of Psk31 Digest V1 #198
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