The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

I have helped 5 guys in the passed month to get there radios up and running vir the PM on this forum and not a one has express any form of gratitude, is just to much to say thanks. Rick. Rick, Your posts keep me thinking and learning. I really appreciate that. Thanks for posting to this forum. Jamie

See my diagram it may help see how the MB3756 voltage reg works in the Cobra 148 GTL http://www.cbtricks.com/radios/cobra/148gtl/graphics/cobra_148gtl_sch_redraw.pdf Rick, Your schematic is the best! Its clear and straightforward! Thanks! I think I may have found an omission on it for your next rev...

Yes it should have been R149. I do know about wire colours from the pot VR402 as this changes from model to model. Sometimes I think thats done just to confuse people working on the radios. Its the factories little joke. After this great thoughtful discussion I like the way you do it best of all. H...

The method I have used as been used for many years with no trouble and as found to be very stable method, if you require more shift with this method I am using just replace the varicap D35 with one which has a ratio of 1.7 to 2.2, the varicap I use is SVC251 or BB909 this will give you a slide of a...

Rick already said to use pin 1 instead of pin 3. Pin 1 runs a constant 8volts, so the answer to your question is YES. Use pin 1. So of all the ways I've seen to unlock the clarifier on a PC412 148gtl is this then the preferred way and will it give the best performance? Revised. 1. jumper R175 2. ju...

Rick, I've seen this version on the net. It promises to be centered with +/- 6 kHz of slide and perfect tracking of Tx with Rx. Is it too good to be true? Could you just use pin 1 instead of pin 3 for this version? Jamie <<If you do the changes below you will get -6kHz to +6kHz with 0 right in the m...