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PRESIDENT C.B.'s with AM and FM are available in 5 models now.

dave3825

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And looks like fm can be added to some other older models.

 

iMONITOR

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And looks like fm can be added to some other older models.


Apparently none of them have CTCSS/DCS. (n)
I saw that. They do have it on their radios sold in Canada so probably just a matter of time and palm greasing!
 

prcguy

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2IR473

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Since President has offered most of these radios to the European market for the past several years, it is understandable why they don’t have CTCSS capability. To add such a feature would require a newly designed board.

It is my guess that these U.S. models with FM are merely firmware-locked versions of the existing EU models, as the EU models allow for expanded frequency coverage to include the channel allocations of several countries, including the FM splinter frequencies of the UK band.

The Harrison radio is a newly designed radio, and includes the CTCSS and noise reduction circuit that many of the new Anytone radios are offering. Since Anytone is an OEM, I might guess that President contracted Anytone to build the board for the Harrison.

I am repeating myself from the other thread about the Harrison, but I am impressed with the Radioddity CS-47/Anytone Graces mini CB AM/FM radio, as it does have CTCSS and NRC, in a small package. It does lack some features of the President models, however it does offer some features that the President radios do not. These radios sell for around $100.
 

Mike_G_D

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Don't forget, FM mode will be a battery hog on a hand held and more so than AM.
Not necessarily, FM does not need a linear amplifier compared to AM. Class C amps can work fine for constant envelope modulation methods like FM. Biased, correctly, in Class C "mode" that will be far more efficient than a linear version like Class A or a modern variant that trades off just enough linearity to increase efficiency. The question is, though, how it is done in the radio - if they cut costs and just run one final amp in Class A (or close variant) mode for both modulations that might not be too good but if they have either two separate amps biased one for AM/SSB and the other for FM OR they have one amp that has some method to change the bias between the two than using FM, in theory, should be more efficient and not drain the power as much as full swing AM would.
 

prcguy

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Not necessarily, FM does not need a linear amplifier compared to AM. Class C amps can work fine for constant envelope modulation methods like FM. Biased, correctly, in Class C "mode" that will be far more efficient than a linear version like Class A or a modern variant that trades off just enough linearity to increase efficiency. The question is, though, how it is done in the radio - if they cut costs and just run one final amp in Class A (or close variant) mode for both modulations that might not be too good but if they have either two separate amps biased one for AM/SSB and the other for FM OR they have one amp that has some method to change the bias between the two than using FM, in theory, should be more efficient and not drain the power as much as full swing AM would.
In my experience AM CB PAs are biased into a fairly linear region and a CB mfr would not redesign or re-bias the PA for class C as there would be no reason to. AM and FM could both produce 4 watt carrier with AM being able to reach 12w peak under full modulation, not counting mod limiter action.
 

Brales60

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I so miss this thing I had back when I was driving with a Wilson 1000.
s-l1600.jpg
 

RayAir

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I had a President HR2510 in the early 2000's. It had FM and frankly who cares.
I can't see how that's a selling point.
The only cool thing about that radio was I discovered some crooked trucking company in Clewiston, FL operating in the 25mhz range using USB. They thought no one would find them down there.
 

Ensnared

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Thank you for this post. I believe I have talked to one person on FM since I purchased my Anytone 500-M.

I suppose skip would be significantly lessened if FM was the norm. At present, skip is rather annoying on Channel 19 here in Texas.
 

krokus

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I want a (FCC legal) CB that has AM, FM & SSB. Those units are common for the EU market, with the applicable standards being the same. What is the hold up on getting that to the USA market?

When FM was allowed in the US, I figured the McKinley was going to get a modification to their type acceptance, and enable FM on the FCC variants.
 

Golay

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So five AM/FM radios, one AM/SSB radio but no AM/FM/SSB radios. I don't think FM is going to be a very big lure and these AM/FM only radios will sit on the store shelves, especially with no CTSSS or DCS.
I took a look at the five President AM/FM radios that iMONITOR started this thread with. The 4 mobiles all have a green tab on the front that says "USB". What's that about?

Also, according to Amazon, the Harrison does have CTCSS and DCS:

 
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