I love your video's soo much, i learn so much, and I'm amazed how complex a simple CB radio is in its function.

Hi Peter, well explained and clean (as always: -) .....). Gerhard is really a smart guy. I have already converted many CB devices with his modules and all worked right away. The price he demands is more than fair. Especially with the Stabo (XF40xxx) devices, the conversion is really easy because there is plenty of space to install. After the installation, it feels like everything has always been like that (no additional switches etc.), I think that's the best. Thank you for the video and the detailed explanation especially at the end. 73 Bernd

Peter, thank you for the most informative videos you share, most educational ! Kind regards, David

Nice CB radio, nice modification and nice explanations. Thanks for sharing you knowledges.

Another very nice and interesting video about cb radio. I hope seeing more videos about cbs, are nice. Thx very much for sharing your time with us.

Hi Peter, Fantastic job getting that old radio to operate on the new frequencies. Gerhard has made a fine PLL replacement circuit. 73 WB3BJU

Your CB Radio videos for me are the best ones.....Thankyou for this and if keep the CB Radios coming for 2019

Great video! I got given a very similar "home base" CB radio many years ago, it was only 22 channel and 0.5W Tx output. I think it was Senfor brand. Being based like this Stabo on a Cybernet chassis, I did a straight swap with a UK spec 134 chassis. The power transformer was much smaller than in the Stabo so was upgraded to suit. I used one of the dual PLL conversion kits available at the time to add the CEPT channels. The UK radios were more tightly tuned in the RF stages and there was some compromise in sensitivity and Tx output power. I used to add a little extra mod to switch in a trimmer capacitor to the Rx RF stage in order to increase sensitivity in the lower band. There were many bad "piggy back" conversions carried out, a lot of them disabled the PLL lock detector, so would cause interference throughout the band as the radio was keyed and the VCO frequency swept on the way to locking. Tx is usually inhibited until the VCO has locked.

Great work yet again Peter, I'm a complete stranger to the workings of radios (so I got lost at turn left at the lights, 😁) but I still like watching your jobs, happy new year mate.

Thanks Pete didn't know those little devices existed for retrofit, very cool.

@43:00 so it is no longer down mixing the PD frequency, and is using the direct VCO frequency for the feedback, I did the exact same thing on the modification board I designed, which uses a different PLL and an Arduino Pro Mini board, only for Uniden Chassis radios, I did a video series on its development about 2 years ago, the mods done for this module are very similar to what I had to do, adjusting the PD filter timing too to reduce jitter.

Thanks Peter! Nice work.

Sunday morning, Hello Peter ;-) Guess what, i am watching while i enjoy my famus cup of tea ;-) Good job, for sure! Gerd is a nice guy, i had several mail contacts in the last years. I did this modification to an old Grundig 2000, a lot more work than Stabo, but superb results. When i was 16 or so, i did my first mod to Grundig by removing the channel selector, inserting an hand wired DIP switch array an i wrote down a big truth chart...it worked fine, but it was a nasty and ugly solution. At this time i never thought that some days such perfect modules will be available. And by the way: I think most people on this channel love the background information theory. Have a good time and 73 de Olaf.

That was great Peter really enjoyed the Mod and installation. Nice that you explained the theory of how the Mod functioned in circuit. Will you do doing more modifications in the future, if so I'm interested. I had to laugh at the end U2 has an Foff pin (lol). Well anyways look forward to the next TRX Bench *_Cheers_* *73*

how broadbanded is it possible to make the chasis for various popular radio.

Thank you for sharing

Hi Peter very well explained there are very clever people out there and it is wonderful what you can do when you have the proper parts and technical know how and another success and was good that the radio output could be extented to give more channels :)

Great and skill as usually, dear Peter. 73s de Pasquale IW0HEX

Great job.thanks

Hi Peter, Nice presentation. The new module and modification of the transceiver looks like original equipment factory work. How flat is the SWR with the 1 MHz band spread?

I'm assuming this transciver wasn't something that was sold in the USA. It looks like a nice CB. Cleanly designed. Not cluttered with unnecessary knobs, meters and switches. Nice clean modification. Nicely explained, and "filmed". 73's

Wow I've never seen nor heard of a 03a PLL and I have a lot of PLL's in my radio room. Is it a close relative of the 02a or 02 or was it just for the European frequencies. 95% of CB's in Australia are 686 or 02a with a smattering of later supposedly non modifiable chips from Motorola and some others where they put the binary divisions on out board chips to prevent channel expansion. It actually made it easier it was straight BCD. Great video it's stirred my interest in older overseas radios again Cheers It may have been 586 uniden chips not 686 it's been 35 years since I was inside CB's

nice R&S i do enjoy the use of comms analysers from the father land

Hi great video as always, i wonder if there is a kit to change this up to 10 metre band...ynx paul

i love radio mods

for better selectivity and sensibility, change the SFE10.7 ceramic filter (bandwidth 150-200KHz) to a 10M07.5A crystal filter (bandwidth 7.5KHz).

Hallo Peter, sie machen wirklich gute und sehr interessante Videos, reparieren sie Funkgeräte die man ihnen zuschickt oder nur Geräte von Bekannten? Kann man die XF 5012 auch erweitern ?

The US channel plan for 1-40 is very similar.

kind of backwards so the radio is 40 below the normal US CB on channel 80, great job

Should you realign after this and make changes 40 middle.

Wäre nicht schlecht gewesen wenn du noch als Vergleich Kanäle 1 und 40 gezeigt hättest denn normalerweise muss der Rx und TX Zweig separat optimiert werden!

80 channels for what country?

Dear TRX-Lab, there is a better solution for Stabo XF2000, it has only 12 channels for AM/FM, but PLL02A, a better PLL-IC, you only need a good Microcontroller-Program and a board, for example STC15 from China with EEprom, but not other PLL-IC for the 80 Channels in Germany.!! The STC15-Board has three 8-bit Ports and it is sufficient for channel display+channel selector +PLL.

01:45 Higher Frequencies? No. Higher Channels maybe.. The Channels 41 to 80 are on the Frequencies from 26.565 MHz to 26.955 MHz. The Channels 1 to 40 are on the Frequencies from 26.965 MHz to 27.405 MHz (in Germany)...

No 27.555?

Sir could you help me with component VSHPS1437_040050680, your help will be appreciated....thanks in advance