03-24-2009, 06:02 PM
| || |
| || |
Join Date: Dec 2008
Location: Silicon Valley CA, Storm Lake IA
| | Cobra 29 LTD Variable Power Mod
When doing the swing mod for the Cobra 29, the CBRadioMagazine page suggests adding a variable power with the added 33 ohm resistor and disconnecting the RF Gain wires from the pot and soldering them together. Then, I am
to link wires from both sides of the 33 ohm resistor and run them back to the RF Gain pot. But - wouldn't this increase the resistance and thereby lower the dead key to the point where there is no dead key watts???
Can someone explain if this mod is correct - and more importantly why?
I'm trying to learn what is happening.
I know they are acting as two resistors in parallel.
But how does two different resistors behave - when one is variable?
Add the resistance any given variable resistance point in the pot with the fixed resistor - and divide by 2?
In addition, what is the best single-final mod for this radio?
BASE: Kenwood TS-2000, GAP Titan DX, Diamond X50A, Sirio SY27-4, and IMAX 2000.
MOBILE: Galaxy DX99V w/RF Limited CR-577 mic, Sirio Z-180. Yaesu FT-8800R & Diamond NR-770.
Last edited by Robb; 03-25-2009 at 02:15 AM.