Elecraft

KPA-500 FOR SALE

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Hunsdon Cary III

KPA-500 FOR SALE

For Sale: Elecraft KPA-500, serial # 0698, solid state linear amplifier, covers 160-6 meters.
Factory upgraded w/ T/R circuit plus 12-meter low pass filter mod on June 1, 2015.
Amplifier "meets or exceeds all factory specifications."
$1750 shipped CONUS. Please contact direct: [hidden email]
Cary, K4TM
Lynchburg VA
434-660-8299

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Johnny Siu

KPA-500 modifications

Does anyone have the any idea about the 'Factory upgraded w/ T/R circuit plus 12-meter low pass filter mod' mentioned in the advert. below?
73
Johnny VR2XMC
寄件人︰ H. Cary <[hidden email]>
收件人︰ [hidden email]
傳送日期︰ 2015年06月10日 (週三) 4:15 AM
主題︰ [Elecraft] KPA-500 FOR SALE

For Sale: Elecraft KPA-500, serial # 0698, solid state linear amplifier, covers 160-6 meters.
Factory upgraded w/ T/R circuit plus 12-meter low pass filter mod on June 1, 2015.
Amplifier "meets or exceeds all factory specifications."
$1750 shipped CONUS. Please contact direct: [hidden email]
Cary, K4TM

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Post: mailto:[hidden email]

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Arie Kleingeld PA3A-2

Re: KPA-500 modifications

Johnny,

I have done that mod.

Reason was that my KPA500 had high SWR at the input and barely any gain.
Tracked the problem down to the TR circuit. One of the switching Fet's
(that switch the TR PIN-diodes) had died.
It proved to be an error that happened before, because for a lousy 12
bucks I got all needed parts for a replacement in a mod-package from
Elecraft. Coming with it were two C's to replace in the 12m LPF. I
replaced them in the same go.

Now all is well!

73
Arie PA3A

Johnny Siu schreef op 10-6-2015 om 0:46:

> Does anyone have the any idea about the 'Factory upgraded w/ T/R circuit plus 12-meter low pass filter mod' mentioned in the advert. below?
> 73
> Johnny VR2XMC
> 寄件人︰ H. Cary <[hidden email]>
> 收件人︰ [hidden email]
> 傳送日期︰ 2015年06月10日 (週三) 4:15 AM
> 主題︰ [Elecraft] KPA-500 FOR SALE
>
> For Sale: Elecraft KPA-500, serial # 0698, solid state linear amplifier, covers 160-6 meters.
> Factory upgraded w/ T/R circuit plus 12-meter low pass filter mod on June 1, 2015.
> Amplifier "meets or exceeds all factory specifications."
> $1750 shipped CONUS. Please contact direct: [hidden email]
> Cary, K4TM
>
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

______________________________________________________________
Elecraft mailing list
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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

Johnny Siu

KPA-500 modifications

Thanks Arie.
寄件人︰ Arie Kleingeld PA3A <[hidden email]>
收件人︰ [hidden email]; Johnny Siu <[hidden email]>
傳送日期︰ 2015年06月10日 (週三) 3:54 PM
主題︰ Re: [Elecraft] KPA-500 modifications

Johnny,

I have done that mod.

Reason was that my KPA500 had high SWR at the input and barely any gain.
Tracked the problem down to the TR circuit. One of the switching Fet's
(that switch the TR PIN-diodes) had died.
It proved to be an error that happened before, because for a lousy 12
bucks I got all needed parts for a replacement in a mod-package from
Elecraft. Coming with it were two C's to replace in the 12m LPF. I
replaced them in the same go.

Now all is well!

73
Arie PA3A

Johnny Siu schreef op 10-6-2015 om 0:46: