[Elecraft] KPA100 Power Malfunction

[John [K7SVV]]

Don,
        I am going to be installing a simpler antenna switching system here. 
Mine will be keyed off of the 12v power supply.  When it is turned off,  the 
antennas on my two operating positions will be switched from rigs to ground. 
The relays will be located outside in a weather proof box attached to 8' 
ground rods.  My only problem is choosing the spdt relays.  May I ask what 
type and brand of relays are you using?

John   [K7SVV]

----- Original Message ----- 
From: "Don Wilhelm" <w3fpr at earthlink.net>
To: "eKotz" <norift at bmi.net>
Cc: <w3fpr at arrl.net>; <elecraft at mailman.qth.net>
Sent: Monday, June 18, 2007 8:43 PM
Subject: Re: [Elecraft] KPA100 Power Malfunction


> Ed,
>
> For the future, consider your antenna situation carefully.  When the 
> station is not operational, all my antennas are grounded (via relays) and 
> the K2 is connected to a dummy load.  I do have an extensive antenna 
> switching system here (not yet complete, but almost there) which relies on 
> the Elecraft KRC2 along with remote relays to select the antenna to be 
> used for each band - yours may be less complex, but consider a switching 
> system to ground the antennas not in use and connect the K2 to a ground 
> (or better a dummy load) when the K2 is not powered on.
>
> 73,
> Don W3FPR
>
> eKotz wrote:
>> Don,
>>
>> You were spot on.   The SWR Bridge diodes D16 and D17 had failed.   The 
>> diodes arrived today in the mail, I replaced them and my K2 is up. 
>> Thank you very much for your help.
>>
>> 73,
>> Ed  -  AD7GR
>> K2 #6050
>>
>>
>>
>> Don Wilhelm wrote:
>>> Lack of power control with the KPA100 installed normally points to a 
>>> failure of the KPA100 wattmeter circuit.
>>>
>>> Start with replacing the 1N5711 diodes D16 and D17...
>>>
>>> If your KPA100 was working at one time and there is *any* possibility 
>>> that you encountered a lightning surge, then D16 and D17 are the most 
>>> likely suspects.
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