Thanks Tom. The next question is; Does it matter which side of the
blocking capacitor I attach the termination to ground. This is a 50 mHz
amp, and to attach to the anodes would mean long leads. If I hang the
resistor at the input to the pi-network, (across C1) the leads can be short.
73,
Mike, W5UC
http://members.cox.net/w5uc
----- Original Message -----
From: "Tom W8JI" <w8ji@w8ji.com>
To: "Mike(W5UC) & Kathy(K5MWH)" <w5uc@cox.net>; "AMPS" <amps@contesting.com>
Sent: Sunday, July 23, 2006 9:10 PM
Subject: Re: [Amps] Pi network tuning
>> Please try this question on for size. With the pi-network built, and the
>> tubes in the sockets and AC coupled to the pi-network, is it possible to
>> determine that the pi-network values are correct by using a Grid Dip
>> Meter to determine resonance of the network? I have a 50 Ohm resistor
>> hanging across the output capacitor.
>
> You won't know the impedance transformation, just resonance.
>
> The normal procedure is to terminate the anode to ground with the expected
> tube operating load impedance and check for 50 ohms at the output port
> with a low power SWR measurement device. You would also have to know at
> least one component value reasonably close and not touch that component to
> verify you are close to planned loaded Q.
>
> 73 Tom
>
>
>
>
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|