[ARC5] Transmiitters: Parameters?

[Kenneth G. Gordon]

Thank you, Dennis. These parameters are very close to "book" values, and look very good.
 
Much appreciated.

Ken W7EKB

On 21 Mar 2016 at 20:30, Dennis Monticelli wrote:

> Ken, 
> 
> Data from a T-22 measured in 2001.  All measurements key down.
> 
> Vp = 468V 
> Ip = 106mA
> Screen = 245V
> Osc - 210V regulated via VR tubes
> Grid bias = -52V across 16K (measured the R)
> Grid current = 3.25mA
> Coupling control at max
> Pin = 49.5W
> Pout = 27W  (54% efficiency)
> 
> I have since boosted the raw DC and added regulation to the plate, running it at 500V. The 
> screen is now regulated at 262V and I made some minor changes to the tank for better loading to 
> 50 ohms.  This has resulted in an operating point of Ip of 100mA which equates to 50W input.  
> Pout improved to 30W yielding a plate efficiency of 60%.  I did not remeasure the grid bias or 
> drive but inasmuch as the osc remained regulated I did not expect a significant change.
> 
> With all the voltage regulation the chirp is quite minor and I consider the 60 percent efficiency 
> pretty darn good given the modest plate voltage and modest drive.  I think it really helps to have 
> those two 1625's in parallel.
> 
> Good luck with your research.
> 
> Dennis AE6C