[Amps] 807 transmitter

[Jim Tonne]

Karl-Arne:

What is the power level involved?  What is the
plate voltage?

- JimT


----- Original Message ----- 
From: "Karl-Arne Markström" <sm0aom at telia.com>
To: "The Bowers" <thebowerz at comcast.net>; <amps at contesting.com>
Sent: Monday, February 05, 2007 3:51 PM
Subject: Re: [Amps] 807 transmitter


> It appears that your tank coil inductance is too high.
>
> For an operating Q of 12 the tank circuit capacitance would be in the 
> 180 - 200 pF range and
> the associated inductance in the 8.5 - 9 uH range (about 2/3 the number of 
> turns)
>
> With the given coil data, the inductance is in the 20 - 22 uH range, and 
> the Q will be too low
> for an usable impedance transformation.
>
> A suitable procedure would be to adjust the inductance for resonance, 
> using a dip meter, with the tuning capacitor about 80 % meshed and the 
> loading capacitor fully meshed. This will work for a start.
>
> 73/
>
> Karl-Arne
> SM0AOM
> ----- Original Message ----- 
> From: "The Bowers" <thebowerz at comcast.net>
> To: <amps at contesting.com>
> Sent: Monday, February 05, 2007 8:56 PM
> Subject: [Amps] 807 transmitter
>
>
>> Has anyone built "K5DH's 807 CW transmitter" (Google) ?  I've built just 
>> the
>> amp section but can't get it to load. I'm driving it with a sig gen at 
>> 3.9
>> KC.
>>
>> According to the on line calculators, L3 is at 10.3 uh, but should be 
>> 18.5
>> uh., for 75 meters.
>>
>> Has anyone found an error here, or is it just me?
>>
>> Thanks guys, I appreciate the help.
>>
>> Dana, W6TUO
>>
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