[TowerTalk] Polyphaser

[w4lde]

Thanks Rodger, great advice.

I wasn't sure as to the actual make up of the Polyphaser but from your 
help and of all the responses now my old brain has kicked into gear.  
Bitch getting old but I still look forward to this up coming sun spot cycle.

73 de
Ron W4LDE

On 3/17/2010 9:02 AM, Roger (K8RI) wrote:
>
> Rick Stealey wrote:
>    
>>   how do I check out the unit to know if its
>>
>>      
>>>> still good?
>>>>
>>>>
>>>>          
>> You take a power supply that puts out 800-1000 volts, put a very large resistor in series with a microampmeter, and attach it to the output coax connector (the antenna side).  There is a gas tube inside from this point to ground.
>>      
> None of mine have gas tubes. They have a solid state device.
>    
>>   It is an open circuit until the breakdown voltage is reached.  So as you crank up the voltage and watch the ampmeter suddenly it will go from zero current to a value limited by the resistor.  A kw polyphasor will begin drawing current in the 600-800 volt range.
>> If it is blown it will never draw any current.
>>
>>      
> Or it'll be a dead short.
>
> The ones I've had fail did neither. The only indication was a high SWR.
> Stick an antenna analyzer on it with a dummy load on the antenna side.
> If the SWR is high it's bad.
> It may actually require power to show it's bad. The two I had that were
> bad, "heard" signals just fine, but when I'd transmit the SWR was about
> 5:1 when it was otherwise around 1.2:1
>
> 73
>
> Roger (K8RI)
>    
>> I didn't look up the model number of your unit to see if it is a 2 kw or a low power unit.  The high power one breaks down as I indicated above and the low power one probably in the 300 volt area (give or take a couple hundred volts !)
>>
>> Rick  K2XT
>>   		 	   		
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