regency range gain

[jacobs132]

i have a real nice regency range gain radio, the old double sideband cb radio that is just a little off frequencie, can some one help me on where the adjusting point is to get it on frequencie, i have a frequencie counter, just need to know where to adjust. there is a cage covering the crystals along with a tube in the cage, is this where it can be dialed in, it seem to be a little off, for example channel 19 is 27.1843. any help would be apreciated, i am looking forward to using this radio, it is nice and clean, modulation is very good, thanks in advance,,,,,,,,, jim

[Sandbagger]

Mar 11, 2010 21:52:38 GMT -5 jacobs132 said:

i have a real nice regency range gain radio, the old double sideband cb radio that is just a little off frequencie, can some one help me on where the adjusting point is to get it on frequencie, i have a frequencie counter, just need to know where to adjust. there is a cage covering the crystals along with a tube in the cage, is this where it can be dialed in, it seem to be a little off, for example channel 19 is 27.1843. any help would be apreciated, i am looking forward to using this radio, it is nice and clean, modulation is very good, thanks in advance,,,,,,,,, jim

Before you attempt to adjust the frequency, you need to dial through all of the channels and determine which channels are off and by how much. If they are all off and by a similar amount, there is a trimmer on the transmit mixer crystal which can net the whole group in. However, if only a handful of channels are off or they're off in different directions, you will have to correct the individual crystals which are off. In many cases you can do this by putting a trimmer cap either across or in series with the crystal depending on which direction the crystal is off and how far off it is.
Of course, the best way to fix it is to replace the crystal with a new one, but that can be both difficult and expensive. Crystal companies can make any frequency you want, but they need specific circuit loading information to cut the proper frequency. That information may not be widely available for 45 year old radios.

[cbrown]

And I'm just adding this... When was the last time your frequency counter was calibrated? You need an accurate reference when aligning your transmit.