Dentron Clipperton-L is pi-network on all bands.
* 73's Jim W5IFP *
w5ifp@gvtc.com
>-----Original Message-----
>From: towertalk-bounces@contesting.com
>[mailto:towertalk-bounces@contesting.com]On Behalf Of Joe Subich, W4TV
>Sent: Thursday, February 04, 2010 01:44
>To: 'Tower and HF antenna construction topics.'
>Subject: Re: [TowerTalk] Using Stubs to Reject Harmonics
>
>
>
>
>Heath SB-1000 and Ameritron AL-80 are pi-L on 160 & 80, pi above
>that. SB-200/SB201/SB-220/SB-221, Drake L4 and L7 are pi-network.
>
>Ameritron ALS-600 is a solid state amp with lowpass filter
>outputs (half-wave - "double pi").
>
>73,
>
> ... Joe, W4TV
>
>
>
>
>
>> -----Original Message-----
>> From: towertalk-bounces@contesting.com
>> [mailto:towertalk-bounces@contesting.com] On Behalf Of Jim Brown
>> Sent: Wednesday, February 03, 2010 4:04 PM
>> To: Tower and HF antenna construction topics.
>> Subject: Re: [TowerTalk] Using Stubs to Reject Harmonics
>>
>>
>> On Tue, 2 Feb 2010 13:49:36 -0600, Tim Duffy K3LR wrote:
>>
>> >Hi Jim:
>>
>> >I always wanted to test the 1/4 wave "insertion" theory, but
>> never got
>> >around to it. I would love to hear what the difference is -
>> if you can
>> >experiment.
>>
>> Tim,
>>
>> I haven't done any measurements, but I did do a literature
>> search of QST
>> product reviews to learn what output circuitry is used by
>> power amps that
>> you and I are likely to be using. What I learned is that
>> MOST, but not
>> all, use the pi-L output configuration -- starting from the
>> tube, shunt C,
>> series L, shunt C, series L. This configuration allows stubs
>> to be placed
>> at the output of the power amp. Amps that use this
>> configuration include
>> the original Ten Tec Titan 425, Alpha 374, 76, 77, 87, 91B,
>> ACOM 1000 &
>> 1010, Ameritron AL-800H, and QRO-2500DX. The AL-82 and
>> AL-1200 use a pi-L
>> on 160 and 80, but pi network on the other bands.
>>
>> I can't find reference to the output network of the current
>> model Ten Tec
>> Titan III, the Alpha 86 or 89, the ACOM 2000, Heath SB-1000
>> or SB-220,
>> Ameritron ALS-600, or Tokyo High Power products. If I were
>> guessing, it
>> would be that they follow suit of other products in their
>> heritage. The
>> Commander HF-1250 and HF-2500 have a pi-network to match the
>> tube to 200
>> ohms, then a 4:1 toroidal xmfr. From a network point of view
>> (that is,
>> interaction with stubs), I'd call it a pi.
>>
>> The Ten Tec Herc II and Centurion, the Kenwood TL-922A all use pi
>> networks.
>>
>> 73,
>>
>> Jim K9YC
>>
>>
>> _______________________________________________
>>
>>
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