w4lde wrote:
> 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
Sure beats the alternative though! Even considering three trips to the
kitchen from the shop before I remembered what I was after. Got side
tracked every time<:-))
73
Roger (K8RI)
> 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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