Re: [Elecraft] KPA1500 duty cycle

[Eric Swartz - WA6HHQ, Elecraft]

The KPA1500 can handle 1500W RTTY contest operation with no problem. Same for 
CW.

(One of our Field Testers is W0YK. See his review on eHam.)

73,
Eric
/elecraft.com/

On 2/15/2018 6:48 AM, Nr4c wrote:

And you can affect duty cycle by adjusting the cw repetition rate. If it gets 
too hot increase the delay.

Sent from my iPhone
...nr4c. bill



On Feb 15, 2018, at 7:39 AM, "j...@kk9a.com"  wrote:

RTTY contesting has a much higher duty cycle, especially when using a
single radio and no one is answering your CQs.

John KK9A


On Feb 15 03:51:39 G4DYA wrote:

The FT8 parameters were tweaked slightly during the beta phase prior to
the release of WSJT-X 1.8.0, and the TX time was reduced to 12.64 sec,
so the duty cycle is now about 42%.

73,
Richard G4DYA

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Re: [Elecraft] KPA1500 duty cycle

[Eric Swartz - WA6HHQ, Elecraft]

Easy to handle for the 1500 on any band. :-)

73,
Eric
/elecraft.com/

On 2/15/2018 12:51 AM, Richard Lamont wrote:

The FT8 parameters were tweaked slightly during the beta phase prior to
the release of WSJT-X 1.8.0, and the TX time was reduced to 12.64 sec,
so the duty cycle is now about 42%.

73,
Richard G4DYA

On 15/02/18 01:22, Dennis Moore wrote:

Specification is 13.48 sec TX, 16.52 sec RX, 45% Duty Cycle.

Source: http://qrznow.com/new-digital-mode-from-k1jt-ft8/

73, Dennis NJ6G


On 2/14/2018 17:07, Tom-KQ5S wrote:

I believe FT8 is 13 sec TX, 2 sec decode and then 15 sec RX for a
total of
17 sec non-TX so you have 13 sec TX and 17 sec RX.  Much less than 50%.

-
73,
Tom - KQ5S

On Wed, Feb 14, 2018 at 6:51 PM, Jim Brown 
wrote:


And even this is conservative -- JT65 is 48 sec TX and 72 sec RX, so 40%
duty cycle. FT8 and MSK144 have equal TX and RX times, so 50% duty
cycle.
The TX period for MSK144 can be varied from 5-30 sec, but TX and RX
times
are always equal.

73, Jim K9YC

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Re: [Elecraft] KPA1500 duty cycle

[Nr4c]

And you can affect duty cycle by adjusting the cw repetition rate. If it gets 
too hot increase the delay. 

Sent from my iPhone
...nr4c. bill


> On Feb 15, 2018, at 7:39 AM, "j...@kk9a.com"  wrote:
> 
> RTTY contesting has a much higher duty cycle, especially when using a
> single radio and no one is answering your CQs.
> 
> John KK9A
> 
> 
> On Feb 15 03:51:39 G4DYA wrote:
> 
> The FT8 parameters were tweaked slightly during the beta phase prior to
> the release of WSJT-X 1.8.0, and the TX time was reduced to 12.64 sec,
> so the duty cycle is now about 42%.
> 
> 73,
> Richard G4DYA
> 
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Re: [Elecraft] KPA1500 duty cycle

[Richard Lamont]

The FT8 parameters were tweaked slightly during the beta phase prior to
the release of WSJT-X 1.8.0, and the TX time was reduced to 12.64 sec,
so the duty cycle is now about 42%.

73,
Richard G4DYA

On 15/02/18 01:22, Dennis Moore wrote:
> Specification is 13.48 sec TX, 16.52 sec RX, 45% Duty Cycle.
> 
> Source: http://qrznow.com/new-digital-mode-from-k1jt-ft8/
> 
> 73, Dennis NJ6G
> 
> 
> On 2/14/2018 17:07, Tom-KQ5S wrote:
>> I believe FT8 is 13 sec TX, 2 sec decode and then 15 sec RX for a
>> total of
>> 17 sec non-TX so you have 13 sec TX and 17 sec RX.  Much less than 50%.
>>
>> -
>> 73,
>> Tom - KQ5S
>>
>> On Wed, Feb 14, 2018 at 6:51 PM, Jim Brown 
>> wrote:
>>
>>> And even this is conservative -- JT65 is 48 sec TX and 72 sec RX, so 40%
>>> duty cycle. FT8 and MSK144 have equal TX and RX times, so 50% duty
>>> cycle.
>>> The TX period for MSK144 can be varied from 5-30 sec, but TX and RX
>>> times
>>> are always equal.
>>>
>>> 73, Jim K9YC
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Re: [Elecraft] KPA1500 duty cycle

[Dennis Moore]

Specification is 13.48 sec TX, 16.52 sec RX, 45% Duty Cycle.

Source: http://qrznow.com/new-digital-mode-from-k1jt-ft8/

73, Dennis NJ6G


On 2/14/2018 17:07, Tom-KQ5S wrote:

I believe FT8 is 13 sec TX, 2 sec decode and then 15 sec RX for a total of
17 sec non-TX so you have 13 sec TX and 17 sec RX.  Much less than 50%.

-
73,
Tom - KQ5S

On Wed, Feb 14, 2018 at 6:51 PM, Jim Brown 
wrote:


And even this is conservative -- JT65 is 48 sec TX and 72 sec RX, so 40%
duty cycle. FT8 and MSK144 have equal TX and RX times, so 50% duty cycle.
The TX period for MSK144 can be varied from 5-30 sec, but TX and RX times
are always equal.

73, Jim K9YC


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Re: [Elecraft] KPA1500 duty cycle

[Tom-KQ5S]

I believe FT8 is 13 sec TX, 2 sec decode and then 15 sec RX for a total of
17 sec non-TX so you have 13 sec TX and 17 sec RX.  Much less than 50%.

-
73,
Tom - KQ5S

On Wed, Feb 14, 2018 at 6:51 PM, Jim Brown 
wrote:

> And even this is conservative -- JT65 is 48 sec TX and 72 sec RX, so 40%
> duty cycle. FT8 and MSK144 have equal TX and RX times, so 50% duty cycle.
> The TX period for MSK144 can be varied from 5-30 sec, but TX and RX times
> are always equal.
>
> 73, Jim K9YC
>
> On 2/14/2018 3:25 PM, Eric Swartz - WA6HHQ, Elecraft wrote:
>
>> Yes, the amp can run indefinitely on 50 Mhz with 50 sec key down TX at
>> continuous 1500W carrier followed by 50 sec in RX. We specifically were
>> looking at 100% carrier modes like JT65 etc. when we conservatively
>> specified this.
>>
>
>
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Re: [Elecraft] KPA1500 duty cycle

[Jim Brown]

And even this is conservative -- JT65 is 48 sec TX and 72 sec RX, so 40% 
duty cycle. FT8 and MSK144 have equal TX and RX times, so 50% duty 
cycle. The TX period for MSK144 can be varied from 5-30 sec, but TX and 
RX times are always equal.


73, Jim K9YC

On 2/14/2018 3:25 PM, Eric Swartz - WA6HHQ, Elecraft wrote:
Yes, the amp can run indefinitely on 50 Mhz with 50 sec key down TX at 
continuous 1500W carrier followed by 50 sec in RX. We specifically 
were looking at 100% carrier modes like JT65 etc. when we 
conservatively specified this.



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Re: [Elecraft] KPA1500 duty cycle

[Eric Swartz - WA6HHQ, Elecraft]

Hi Erik,

Yes, the amp can run indefinitely on 50 Mhz with 50 sec key down TX at 
continuous 1500W carrier followed by 50 sec in RX. We specifically were looking 
at 100% carrier modes like JT65 etc. when we conservatively specified this.


73,
Eric
/elecraft.com/

On 2/14/2018 11:07 AM, Erik Basilier wrote:

A recent Elecraft newsletter stated that "the KPA1500 is a high duty cycle
amplifier compatible with most digital modes ranging from RTTY through JT65
etc.". The KPA1500 manual specifices  for 50 MHz "Maximum 50 sec key down /
50 sec standby (Rec. Min Fan Speed set = 2)".

My question: For the 50 MHz scenario of alternating 50 sec carrier and 50
sec standby, how much testing has been done? Has anyone run this way for
days on end?

73,
Erik K7TV


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