[Amps] increasing rf gain in driver stages (sb-104) ?

[Dan Sawyer]

The topic area is the SB104(A) HF oscillator and amplifier 'D' board. 
The first question is can the output of the oscillators be varied by 
changing the emitter RF bypass cap value? I believe it can.

The second question is: Can the output of the first stage driver be 
changed by both changing the emitter bypass cap value and or by changing 
the collector resistor from 400 Ohms to 200 Ohms. I believe it can.

Do these assumptions make sense?

Thanks - Dan

R; Measures wrote:

>
> On Mar 15, 2006, at 6:59 PM, Dan Sawyer wrote:
>
>> All,
>>
>> I have an older transistor based transceiver. I have separated the
>> circuit and substituted an external signal generator in place of the
>> internal circuit. The circuit drives a mixer, by varying the amplitude
>> the mixer performs better with about a 4x increase in drive.
>>
>> My question is: what is the best way to increase the output of an
>> amplifier stage?
>>
>> Is it as simple choosing a transistor with a higher beta?
>
>
> More Beta decreases the amount of input/base current needed to produce 
> the same output. More Beta does not increase the V-gain of the stage.  
> In other words, more Beta raises the input Z.
>
>>
>> ...
>
>
>
> Rich Measures, 805.386.3734, AG6K, www.somis.org
>