Lafayette Wisconsin - Page 1
Forum section: electronics / general

author: Simon123
author_rank: Regular Contributor
timestamp: November 16, 2014, 02:33:23 pm
content: Hello!I have this Wisconsin CB radio, but i dont know if its FM or AM?I think its AM, but im not shure?Thanks

author: Richard Crowley
author_rank: Super Contributor
timestamp: November 16, 2014, 03:31:22 pm
content: It would be easy enough to see on most any old oscilloscope. Are there other people on CB in your area? You could just try it on the air and let the people at the other end tell you first-hand.

author: dr.diesel
author_rank: Super Contributor
timestamp: November 16, 2014, 03:33:31 pm
content: Although not my area of expertise, I don't believe they ever made FM CBs. At least in the states only AM is allowed via the FCC.

author: Simon123
author_rank: Regular Contributor
timestamp: November 16, 2014, 03:36:43 pm
content: ThanksI cannot test if its am or fm because i need to fix something with mic preamp and speaker amp first.

author: Richard Crowley
author_rank: Super Contributor
timestamp: November 16, 2014, 03:39:06 pm
content: Quote from: dr.diesel on November 16, 2014, 03:33:31 pmI thought that also until I read the Wikipedia article which mentioned not only AM and SSB (here in the USA), but also FM in other countries.http://en.wikipedia.org/wiki/Citizens_band_radio#Frequencies_worldwide

author: TheBay
author_rank: Unknown
timestamp: November 17, 2014, 08:12:57 am
content: UK was FM, im sure I've seen the Lafayette brand many years ago, but not familiar with that model. Pop the lid off and post some pictures on here.

author: Simon123
author_rank: Regular Contributor
timestamp: November 17, 2014, 01:16:06 pm
content: Here they are.The second picture shows area im repairing. Audio amp was shorted and some other components let the magic smoke out.https://lh3.googleusercontent.com/-tXNKJELyd0c/VGn1AvA1c2I/AAAAAAAAAWY/AF85ADHEkKU/w958-h719-no/DSC01237.JPGhttps://lh6.googleusercontent.com/-GR-fSauKEsQ/VGn1AWBhCwI/AAAAAAAAAWU/f4oT4A4F4DE/w958-h719-no/DSC01238.JPGPLL is LC7131, mixer is KIA7310

author: TheBay
author_rank: Unknown
timestamp: November 17, 2014, 01:41:39 pm
content: Quote from: Simon123 on November 17, 2014, 01:16:06 pmThat's AM (SW Band)

author: Simon123
author_rank: Regular Contributor
timestamp: November 17, 2014, 01:47:06 pm
content: Thanks.

author: TheBay
author_rank: Unknown
timestamp: November 17, 2014, 01:49:53 pm
content: Quote from: Simon123 on November 17, 2014, 01:47:06 pmA few years old that, has to be late 1970'sWhat band CB is used in your country?, if you get it working you should be able to pick someone up even offshore with a big enough aerial

author: Simon123
author_rank: Regular Contributor
timestamp: November 17, 2014, 02:21:22 pm
content: Some time ago only FM was legal, but people still used AM anyway.Now both modulations are legal and most truckers are on AM.Only taxi and church uses FM i think.I already have FM station, but there is very little activity, when there isn't any skip.

author: Simon123
author_rank: Regular Contributor
timestamp: November 17, 2014, 08:41:22 pm
content: And by the way does anyone have schematic for this CB?When i plug in my mike and speak the led modulation graph doesn't move.When i inject sound into mixer it does work and im a bit lost on this tiny board.Thanks

author: tinytim
author_rank: Contributor
timestamp: November 19, 2014, 09:35:03 pm
content: http://cbtricks.com/radios/lafayette/index.htm

author: Simon123
author_rank: Regular Contributor
timestamp: November 23, 2014, 01:08:28 pm
content: Thanks, maybe i find schematic thats similar.

author: Simon123
author_rank: Regular Contributor
timestamp: November 23, 2014, 04:28:04 pm
content: I have found maxon jaws 2 that is similar:http://www.cbtricks.com/radios/maxon/jaws_mark_2/graphics/maxon_jaws_mark_2_sch.jpg

author: Seekonk
author_rank: Super Contributor
timestamp: November 23, 2014, 05:55:05 pm
content: I used to work at a Lafayette service dept in my college days. Was there when the bottom fell out of CB. The store managers were screaming for more CB stock. The owner said his computer programming indicated the market had reached saturation. Sure enough, three months later you couldn't give them away. When did they finally fold up? For those looking for FREE downloadable test equipment manuals there is BAMA. Haven't been there for a while. A google search for boatanchors manuals should bring it up.

author: Simon123
author_rank: Regular Contributor
timestamp: November 24, 2014, 08:59:42 pm
content: Thanks!