President HR2600 11 meter modification Xtal swap for CB frequencies

http://www.cbradiomagazine.com
Short video showing the inside of the HR2600 and discussing the Xtal swap modification to make the HR2600 work on 11 meters. Normally people will do the chip replacement by installing the chip from a HR2510 or by installing the Chipswitch modification, but another method is to change out the 22.000MHz crystal for a 20.000MHz crystal which lowers the radios operating frequencies by 2.000MHZ. This change does not effect the display though so after the modification the radio display will show 29.3850 but the radio will be transmitting and receiving on 27.3850.

I don't recommend this modification - the majority of people would find it impossible to be able to tune the radio correctly after doing the mod so that it could receive properly.

Category:

Howto & Style

Tags:

• President
• HR2600
• Uniden
• HR2510
• Lincoln
• Chipswitch
• Modification
• 11
• meter
• frequency
• Xtal
• crystal
• CB
• radio
• AM
• LSB
• USB
• PLL

[simov8chevy]

where'd you get your 20mhz crystal. Cant locate any at all.

[cbradiomagazine]

@simov8chevy - First off I don't recommend this modification. I did this video 3 years ago and the place I bought the crystal from has since gone under but you may be able to find one from someone on eBay or I'm sure there are some shops online that would have them.

Again - you'd be much better off sending the radio to Rogerbird or Doc and have them modify it via a different method. The mod shown in the video was more just to show it could be done and isn't recommended.

[HiRiderAce]

Hummmm, you say receiving on 27.185.0 at 2:15 in the clip as it displays 29.185.0 lol

[cbradiomagazine]

@HiRiderAce - Yes that's exactly right. The radio is receiving on 27.185 even though the display shows 29.185. If you read the description under the video it explains in detail this modification and how it effects the display.

[CircuitGuy75]

I have heard replacing the 2600 chip for a 2510 one does not work. The crystal change seems like it would work. I know someone who tried swapping the main chip, and it did not work.

[cbradiomagazine]

You can replace the 2600 chip with the 2510 sucessfully. Rogerbird and Doc in NY both perform that modification.

[urbex2007]

I've got one of those! Had it since 1989 and it packed up last year. It no longer TXs, even if the mic pins are connected. Any idea which transistor switches the radio in to TX as that is the one that has gone. I would love to get the radio going again as it is such a shame to be sitting in a cupboard. Mine was modified for 40watts FM and it does more on SSB. RX isn't as good as some radios but overall it is great. If you know which transistor switches RX/TX let me know!!!

[skypilot0077]

The chipswitch is the only way to go with the 2600. The other ways to get them onto 11 meters not worth the trouble for the what you get when you're done. The chipswitch chips can still be found on the internet. They're well worth the money. No retuning was required on my rig. Change the chip and you're done.

[urbex2007]

@urbex2007 found it, repaired ages ago from using a transistor from the junk box!!!!

[trikerdave1]

hi i have a lincoln ,i get a slight feed back on ssb can hear myself and modes to stop this thanks

[bigpimp347]

do these rigs not TX 26 to 30mhz like the lincoln, 2830 and 2510 ???

[VImessenjah]

did you try an external speaker to compare audio difference? try that first, if done so and get the same result, you may then have a leaky capacitor.