[TenTec] Model 315 Receiver S-Meter

[Byron Tatum]

Some progress made -    I experimented with the value of R-1, the 15K resistor on Control Board that goes from S-Meter Zero pot wiper to the S-Meter positive terminal. This resistor acts as a multiplier for the meter. I used a pot initially and arrived at an S-Meter behavior very much like the 505 Argonaut with an R-1 value of 4.7K The model 315 and Argonaut 505 share some nearly identical circuits.So, anyone wishing to have a more "typical" reading (more lively) S-Meter can replace R-1 with a 4.7K. I saw no effect on the "R" voltage, or anything else that I could tell.   I may install a 15K trimpot, wired as a variable resistor, in place of R-1 instead of using the fixed 4.7K resistor. My thinking on this is that in my next endeavor to increase the effectiveness of the AGC (to eliminate some slight distortion with strong signals) the end result will be a higher AGC voltage being developed to drive the "R" voltage lower. This in turn will make the S-Meter read higher so adjustment to R-1 value will be needed again (to increase it a little).  Any Model 315 users out there?Byron W5FH