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 Post subject: Ten Tec 555 RF First Stage Amplifier ( Component Value )
PostPosted: Feb Sat 22, 2020 9:16 pm 
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Hello.

Ten Tec Scout 555 Amateur Radio.

Curious, if you could help to determine the value of two Inductors in a RF ( 1.8 MHz - 30 MHz ) Transistor Power Amplifier ( 1st Stage ) Push - Pull Amp Circuit. ( ? )

The manufacturer failed to print two Inductor values on the Schematic of the components in the (attached) picture - Schematic.
Components L3 and L11 - what would be reasonable values of these ? ? ?

Thank you for any help.
cferry1


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 Post subject: Re: Ten Tec 555 RF First Stage Amplifier ( Component Value )
PostPosted: Feb Sat 22, 2020 11:14 pm 
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Location: New Hampshire, USA
I would suspect they are 1uH. Looks like they’re there to block the RF, just like L9 and L11.

-Scott


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 Post subject: Re: Ten Tec 555 RF First Stage Amplifier ( Component Value )
PostPosted: Feb Sat 22, 2020 11:41 pm 
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Schematic has two inductors labeled L11 but, as indicated in the previous post, 1uH is a good guess.

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http://www.classicradiomanuals.com


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 Post subject: Re: Ten Tec 555 RF First Stage Amplifier ( Component Value )
PostPosted: Feb Sun 23, 2020 1:13 am 
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Location: New Hampshire, USA
manualman wrote:
Schematic has two inductors labeled L11 but, as indicated in the previous post, 1uH is a good guess.


Yeah, my bad. I meant to type L10.


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 Post subject: Re: Ten Tec 555 RF First Stage Amplifier ( Component Value )
PostPosted: Mar Wed 11, 2020 4:00 pm 
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Ten Tec used a lot of miniature radial lead RF chokes for those applications. I'd say they are 100-uH radial lead chokes based on the Paragon and Omni series rigs. Those are for decoupling, and not part of a resonant circuit.

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 Post subject: Re: Ten Tec 555 RF First Stage Amplifier ( Component Value )
PostPosted: Mar Sat 28, 2020 8:30 pm 
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Location: Western Maryland, zipcode 21722
Thank You for All your suggestions.
I believe you / we are on target or at least close !


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