Ive used the T on a few conversions such as when I drove a low impedance
such as a 3 hole Alpha 76. The Pi is more forgiving when going from Eimac to
Chinese 3-500's as an example
I also use a T on the 2M 3CX1000A7 and 222 8877 as the operating range is so
small its a set and forget and I wanted a high Q for selectivity to keep the
unwanted transverter products way down.
Carl
KM1H
----- Original Message -----
From: "Zeitler, Lane LT, FST-1" <zeitlel@cpr3.navy.mil>
To: "TL_IARC" <4z4tl@iarc.org>; "Carl" <km1h@jeremy.mv.com>;
<amps@contesting.com>
Sent: Sunday, March 21, 2010 8:17 PM
Subject: RE: [Amps] Tuned Input for G-G 50Mhz amp
I believe Swan/Cubic in the 1500Z model amp used a "T" input network vs
a "pi". Not too many of these were made and are somewhat rare on the
used market. I had one for a short time about 15 years ago. Built like a
tank. Input vswr to the solid state rig was very flat.
Lane
Ku7i
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
On Behalf Of TL_IARC
Sent: Sunday, March 21, 2010 3:16 PM
To: Carl; amps@contesting.com
Subject: Re: [Amps] Tuned Input for G-G 50Mhz amp
Hi Carl,
Thanks.
I thought a "Tee" would be easy to tune outside the amp in real time
(one
cap), and would basically achieve the same result as the "Pi".
Someone elsewhere mentioned better harmonic treatment with the Pi, but I
can't relate to that as I have limited knowledge.
73
Isaac, 4Z4TL
----- Original Message -----
From: "Carl" <km1h@jeremy.mv.com>
To: <4z4tl@iarc.org>; <amps@contesting.com>
Sent: 21 03 2010 16:27PM
Subject: Re: [Amps] Tuned Input for G-G 50Mhz amp
> Pi as it allows a more efficient match as well as a lower Q for a no
tune
> 400-500kHz bandwidth.
>
> Carl
> KM1H
>
>
> ----- Original Message -----
> From: <4z4tl@iarc.org>
> To: <amps@contesting.com>
> Sent: Thursday, March 18, 2010 6:11 PM
> Subject: [Amps] Tuned Input for G-G 50Mhz amp
>
>
>> Hello all
>>
>> Trying to decide between a "Pi" and a "Tee" input circuit, for a
50Mhz
>> single 3-400Z amp.
>>
>> (formerly AL-80A with 3-400Z and not the 3-500Z).
>>
>>
>>
>> Any thoughts please?
>>
>>
>>
>> Thanks in advance, Isaac, 4Z4TL
>>
>>
>>
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>
>
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