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FM and Linear AMPs?
- Thread starter T23
- Start date
use it on AM setting,thousands of people in europe manage it day in and day out with no problems,infact FM is easier on your amp than AM when both have the same carrier power,as it has no modulation peaks for the amp to deal with.
Most Class "C" CB-type amplifiers are quite well suited to FM operation. The same amplifier shouldn't be used on AM, SSB, or any other mode in which the amplitude varies significantly, because they aren't "linear" amplifiers.
Not all amplifiers are "linears".
Not all amplifiers are "linears".
i perfer fm over am anyday much cleaner sounding and with the squelch
adjusted rite its dead quiet until someone keys up .i love it
adjusted rite its dead quiet until someone keys up .i love it
For ground-wave talking, yes.
But for skip talking, FM is bad because the skip fading distorts the FM in a way which makes it easily garbled.
Of course FM has swing: frequency swing.
FM has it's advantages at mid to high level signals where the capture effect ensures the strongest signal is clear,but at low level signals AM can have the advantage at picking out very weak audio,especially too the trained ear.
AM has the advantage if there is a mic keyer with a slightly stronger signal than the desired station you can usually resolve the weaker station below the carrier of the mic keyer, on FM that would be nigh on impossible as the strongest signal rules supreme.
Both modes have their advantages/disadvantages,but none of them compare to SSB which is quite frankly vastly superior.
one thing that will fry your brain on FM is if you sit with an open squelch listening fo low level stations like you can on AM, the superhet noise will cook your brain when there's no signal/carrier to quieten the receiver.
Most of Europe uses FM,as it's less prone to interference than AM or SSB.
i think every mode has its disadvantages and advantages with local chatting
and short ground wave like you said is great. never did any dx on fm but then
i havent tried. for dx and long groundwaves is definately ssb
Wow, didn't know this topic would be that popular...
I suppose AM and SSB would be better for DX, but if you go on youtube there a few videos of a Scottish guy talking to a French guy on FM while the conditions for DX are right and the audio qualtiy is still right decent...
T23
I suppose AM and SSB would be better for DX, but if you go on youtube there a few videos of a Scottish guy talking to a French guy on FM while the conditions for DX are right and the audio qualtiy is still right decent...
T23
This is very true. Many times when I am talking on Am, there are so many people on the key, that it is almost impossible to hear everything your contact is saying. BUT... if you have a trained ear, you can pull out most of what he is saying, and still carry on a good conversation. To me, this is what dxing is all about. Being able to understand what the station you're talking to is saying, even if you can't hear all of it.
If my wife is with me in the shack when I'm copying strong dx ,usually she will say," How do you understand what he's saying?" Typically my reply is," you just have to have a good ear for this."
Once when I was living in SoCal, I was talking to a station in Arkansas. We both had FM, so we switched over. I couldn't believe the difference. The signal strength was the same, but the noise and interference disappeared. Maybe FM skip is the way to go. Dunno.
- 399
FM DX is the best and when my wife speaks when I'm listening I tune her out like the other stations I do not wish to hear.
I have been wanting to try that on FM, I'll have to wait till I get an FM C.B though, the audio quality in the previous mentioned videos was pretty good, the only reason I think AM skip is noisy is because of the "crowded" band during skip conditions. Now SSB skip is right good aswell, audio quality is great also, but I haven't had a chance to try all modes of operation while skip is happening, at least not FM anyways...
T23
T23
That's what happens when the spectrum is segregated by people and a powerful government entity and the no gooders are pushed into a singular small portion of that spectrum, greed is an ugly thing and if you ever take time to listen to those people in the hf portion of the spectrum you'd be appalled by it such as I am.
For the most part the world is a good place it's only when we're treated in this manner that it appears we're the one's who are wrong.
Keep trying for your fm contacts, I'm sure you'll have your chance just like I have.
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