First AM/FM FCC Approval

[Captain Kilowatt]

"Still, I don't know why FM on CB wasn't legal a long time ago."

in 1958 uhf equipment available @ the time was large, heavy and expensive.

He didn't say since day one. Europe and most of the rest of the world operated FM on their CB service decades ago. No reason why North America could not have followed suit.

 

[Caish]

What a waste, but its a gift to the manufacturers, give them a new widget to sell to the people.
then imagine the noise, have xyz on am, and then some yoyo just starts using FM, just to be an arse.
CB has been out of control for years, with little to no enforcement..
Times I enjoy the laid back attitude of CB vs HAM, Ham is so rigid, call signs every xx minutes, and much of my HAM use feels faked, I really enjoy the freedom of just being on the air on CB.
Both have their pluses and negatives.

 

[ljh505]

https://president-electronics.us/CB-Radios/AM-FM-transceivers/THOMAS-FCC

No PL/CTCSS or DCS squelch? Even cheapo blister pack FM radios have a CTCSS/DCS squelch these days.

 

[Tim Chambers]

https://president-electronics.us/CB-Radios/AM-FM-transceivers/THOMAS-FCC


Hoop there it is.

73
Jeff

President Andy 2 FCC & Thomas FCC:
Lift the leg of the SMD transistor (circled in Red) pointing to rear of radio. This is the Modulation limiter.
To really open the carrier modulation, solder the cathode (banded end) of a 1n914 or 1n4148 diode to the center leg of the AM regulator and solder to the front of radio side of the SMD capacitor. Use a fine tipped soldering iron and be careful.
This will give you aprox. 4-5 wats of carrier development as well as make the radio significantly louder and more powerful.
Easy 22-25 watts PEP and about 7-9 AVG/RMS watts.
Identical circuit in both these radios.
Enjoy. Tiny ;-)

 

[WECSOG]

CB should have gone the way it was originally planned on 462mhz (now GMRS)FM.

It did. Then we got 27 MHz, in addition to 462.

 

[WECSOG]

https://president-electronics.us/CB-Radios/AM-FM-transceivers/THOMAS-FCC


Hoop there it is.

73
Jeff

Too bad it doesn't have a side mic. Hilarity would ensue!

 

[w9cll]

It did. Then we got 27 MHz, in addition to 462.

No it should have never been on 27

 

[WECSOG]

No it should have never been on 27

I would rather (and do) have both.

 

[w9cll]

I would rather (and do) have both.

Well then you are happy

 

[WECSOG]

Well then you are happy

Interestingly, on a recent cross-country trip I made more contacts on GMRS than on 2M. GMRS was almost like 2M was, 20+ years ago.

 

[Allen B]

No it should have never been on 27

Why is there so much hatred for CB being on 27mhz?

 

[whiteastro]

Why is there so much hatred for CB being on 27mhz?

Years ago CB band was taken away from the Ham Band world. And it is human nature for people to think everyone should be & think just like them because they are perfect in their own mind. A flaw in the human character. The last company I worked for valued Diversity !

 

[Allen B]

Years ago CB band was taken away from the Ham Band world. And it is human nature for people to think everyone should be & think just like them because they are perfect in their own mind. A flaw in the human character. The last company I worked for valued Diversity !

I love how some hams claim CB was "taken" from them. If they really understood how our government works, they should be lucky it was ever "givin" to them in the first place.

But this was a discussion about FM on CB, so 27mhz or not....FM here we come.

 

[whiteastro]

But this was a discussion about FM on CB, so 27mhz or not....FM here we come.

Life, Liberty, and the per suite of Happiness !

 

[WECSOG]

Years ago CB band was taken away from the Ham Band world. And it is human nature for people to think everyone should be & think just like them because they are perfect in their own mind. A flaw in the human character. The last company I worked for valued Diversity !

Here are some interesting comments that I found on qrz . com:

There were a number of problems with the amateur 11-meter band. First of all, it was not harmonically related to the other HF bands and, as such, crystals and VFOs that covered the 160-meter, 80/75-meter, 40-meter, 20-meter, 15-meter, and 10-meter bands could not be used on the 11-meter.
Next, amateur radio operation wasn't even secondary but was terciary to other services including industrial ("plasma" uses) and medical (diathermy) which put out considerable, broad band, interference. In urban and suburban areas the 11-meter band was almost useless, because of this wideband interference, a majority of the time.
Then, and this is of great importance, the 11-meter band was actually allocated to land-mobile operation by the ITU. As such, when the Class "D" Citizen's Radio Service was proposed, in 1957, that service actually was in compliance with the ITU allocations. That is, "CB" qualifies as a land-mobile service whereas amateur radio does not qualify.
When the Novice Class license was first in place, the HF operations were CW only on the 80-meter band and CW only on the 11-meter band. However, since the 11-meter band was basically a wasteland, the FCC soon changed the Novice HF segments to portions of the 80-meter, 40-meter, and 15-meter bands.
There actually was very little amateur radio usage of the 11-meter band. When the FCC first proposed the Class "D" service, the ARRL protested greatly and even tried to have a series of contests on the 11-meter band to increase the usage of this band. However, those efforts failed miserably!
Glen, K9STH