[OKDXA] ELECRAFT KPA1500

[John Geiger]

Because the DX can't always hear me with 100 watts!

73 John AF5CC

On Thu, May 26, 2022 at 3:03 PM Tim Duffy <k3lr at k3lr.com> wrote:

> The problem is this.... FT8 is a LOW power mode!
>
> Why is ANY station using more than 100 watts on FT8?
>
> 73
> Tim K3LR
>
> -----Original Message-----
> From: okdxa-bounces at mailman.qth.net [mailto:okdxa-bounces at mailman.qth.net]
> On Behalf Of Roger Simpson
> Sent: Thursday, May 26, 2022 10:59 AM
> To: Oklahoma DX Association
> Subject: Re: [OKDXA] ELECRAFT KPA1500
>
> Gary:  I have an Amertiron 1306 aslo.  I have had a similar problem to
> yours with the 1306.  Namely it will just NOT support FT8 at the high duty
> cycles that FT8 uses. In my case I did NOT burn up the the amp . But the
> amp was not suitable for FT8 since it would shut down on its own after a
> few minutes of running FT8 at a power level of about 300W.
>
> I bought an ACOM A2100, which uses a vacuum tube final. The ACOM uses a
> 4CX1000. I have been using the ACOM now for about six months. It is holding
> up OK on FT8.   FT8 has a much higher duty cycle than CW or SSB or RTTY.
> With FT8 you are running “full power” solid for 15 seconds half of the
> time. You only get 15 seconds of rest for the linear to cool down.
>
> I think the Ameritron 1306 needs better cooling such as a bigger fan with
> more air circulating.  I personally don’t know if there is a solid state
> amp that is suitable for FT8 or not.  I don’t know about the Elecraft amp.
>
>  I notice that big contest super-stations, such as K3LR, are using vacuum
> tube amps. In K3LRs case they are homebrew amps. Vacuum tube amps have to
> warm up, they use semi-obsolete parts, and they may have loud fans, but
> they hold up with high “brick on key” duty cycles.
>
> 73    Roger   K5RKS
>
> ================================================
>
> Sent from Mail for Windows
>
> From: garylm at kiamichiwb.org
> Sent: Wednesday, May 25, 2022 9:05 PM
> To: OKDXA at mailman.qth.net
> Subject: [OKDXA] ELECRAFT KPA1500
>
>
>
>
>
> HAS ANYONE HAD ANY  DEALINGS WITH AN ELECRAFT KPA1500 SOLID STATE AMP?
> HOW THEY HOLD UP USING DIGITAL MODES,  I HAVE HAD AN AMERITRON ALS1306 AND
> IT WOULD NOT HOLD UP TO WORKING FT8 KEPT LOOSING FINALS.
> WONDERING IF THE KPA1500 HAD THE SAME PROBLEMS.
> BOB AT ELECRAFT THANKS THEY WILL HOLD UP USING DIGITAL MODES,  WOULD LIKE
> TO HEAR FROM SOMEONE WHO HAS USED THEM  WORKING STATIONS DAILY.
> THANKS
> GARY
> WQ5R
>
>
>
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