[Amps] Ameritron Amps

[PA3DUV]

Polycarbonate seems to perform well at both low and high frequencies.
@ 1.2 kW input in my center loaded mobile vertical the Lexan loading coil 
tube with internal helix groove where the coil wire is embedded works very 
well in mobile SSB service. I guess that sort of plastic could be used in 
tuners and amplifier
tank systems too.
Cheers, Dick
PA3DUV


>> From: R L Measures <r at somis.org>
>> Date: August 5, 2006 6:06:36 AM PDT
>> To: Steve Thompson <g8gsq at eltac.co.uk>
>> Cc: amps at contesting.com
>> Subject: Re: [Amps] Ameritron Amps
>>
>>
>> On Aug 4, 2006, at 11:40 PM, Steve Thompson wrote:
>>
>>>
>>>
>>> R L Measures wrote:
>>>
>>>>> Unless I've been labouring under a misapprehension, the melting was
>>>>> attributed to a vhf parasitic rather than normal hf operation.  I 
>>>>> reckon
>>>>> that glass which changes its loss so much between those  frequencies 
>>>>> is
>>>>> so special as to be magic.
>>>>
>>>>
>>>> At 50Hz - 60Hz, nylon works well, quite but at 20MHz it gerts hotter
>>>> than ____.
>>> Sure, but that's change in frequency of x400,000, not x4. How does 
>>> nylon
>>> do at 200Hz?
>>
>> About the same as at 60Hz, Steve.  For unwonderful around RF  plastics 
>> like Nylon, Delrin and some types of PVC, D-factor begins  to rise 
>> noticably between 100kHz and 1MHz, and by 10MHz, it looms  large.
>> - note - Plastics are typically speced at 0.1MHz, 1MHz and 10MHz.
>>
>>
>>>
>>> Steve
>>> _______________________________________________
>>> Amps mailing list
>>> Amps at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>>
>>
>> R L MEASURES, AG6K. 805-386-3734
>> r at somis.org
>>
>>
>>
>
> R L MEASURES, AG6K. 805-386-3734
> r at somis.org