80 meters AM
Recently saw a post about the Ensor Farm Museum putting a restored 1918 transmitter on the air on or around the 8th of December. I got motivated to play with a little 80 meter AM and was curious if anybody had suggestions. I run with a Yaseau 950 and a Hustler multiband verticle. Any suggestions from the AM community out there?
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I am in the same boat you are. I would like to give it a try but I have not finished my 101-EE. Currently using my 450-D. I have heard that most of the groups use older AM equipment which have much better audio quality on AM. I listen a lot on 3885 but have never transmitted, not sure if newer equipment is looked down upon.
73 - Jay
Small but important bit:
On the 3.5 to 4.0 MHz amateur band, the part where voice is allowed in the USA is referred to as "75 meters" and the part where voice is not allowed is "80 meters". So 3.5 to 3.6 is "80" and 3.6 to 4.0 is "75".
This isn't just casual ham jargon - FCC Part 97 spells it out that way.
73 de Jim, N2EY
AM is alive and well in that portion of the band. I've never heard anyone critize a well modulated "modern"radio.
I've even heard guys using Flex radios. There is also AM action on 40M @ 7.295 Here's a good link for AM stuff.http://www.ami-west.com/
"If it aint broke don't fix it. "If you can't fix it get a bigger hammer."
New ham gear is not looke down upon by the AM crowd at all. Since using new gear isn't very "experimental" or "homebrewed," there's not as much to talk about -- and the AMers love to talk about what equipment they've brought back to life and modified to work better...that's a lot of the conversation.
However, nobody will care if you use a brand new solid state multimode rig, as long as you've set it up properly for AM. A lot of AM enthusiasts have good stuff and good ears and will help you make adjustments until it does sound good.
An FT-450D will sound much better on AM than the old FT-101EE will. There's a world of difference: With the new rig, AM is generated via DSP and can be absolutely "perfect" if you do everything right. With the older rig, it's not, and no matter what you do it won't be perfect AM.
Remember "full" AM PEP is four times carrier power, so if you use a 100W output rig, the carrier should never be more than 25W, to allow for full modulation that sounds good. Often, the adjustments for things like high and low frequency rolloff need to be changed for AM (compared with SSB), and TX bandwidth should be cranked up wider; and usually, a speech processor is a bad idea for AM, even if it works great on SSB.
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Yes they do Jim, but wavelength is just a generalized term and not necessarily the letter of the law. Example; 3.6MHz is 83.33 meters. It's not 75 meters until you get to 4MHz. 80 meters is 3.75MHz. The bottom of the 80/75 meter band is about 85.71 meters at 3.5MHz. We quit using the wavelength to measure frequency a long time ago. It's just a generalized measurement so everybody is talking on the same page. The FCC uses these terms to relate to amateurs and get the message across clearly and easily where you are allowed to operate and where you're not.
It's just small stuff so don't sweat it. Just don't operate improperly.
- 003,880,000 Hz
- 150 Watts P.E.P.
- 060 % Average Modulation
- 20 dB Processor Compression
- 3,000 Hz(1,500 Hz X 2) Resultant Passband via
audio, on rig, set to "high-pass"
- 080 Meter Band Dipole(140 feet long!) with it's
ends bent down(the last 16 feet!) up 38 feet in
the air at it's feedpoint(The total horizontal length
is 108 feet.).
These suggestions might be a bit controversial. The operator making these suggestions IS controversial. However,
I recommending them because I myself would do them also. It makes good sense.
I operate on: 040 Meters @ 007,290,000 Hz; 025 Watts P.E.P.; A3E(AM); 060 % Average Modulation; 20 dB Processor
Compression; 3,000 Hz(1,500 Hz X 2) Resultant Passband via audio, on rig, set to "high-pass"; with a 040 Meter Band
Dipole at half the overall dimensions as the afore mentioned 080 Meter Band Dipole. I use a Kenwood TS-570D
Transceiver with it's stock microphone.
I AM HEARD WELL within 400 miles during the day, 1,000 miles at night.
P.S.: The mathematics behind the suggestions are long and boring, but available if you need them.
P.P.S.: It's true. The F.C.C. distinguishes between the 080 Meter Band(003,500,000 Hz =to= 003,600,000 Hz)
and the 075 Meter Band(003,600,000 Hz =to= 004,000,000 Hz).
Last edited by N3IFD; 10-06-2012 at 04:33 PM.
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pray tell what with the extra zeros in front
Originally Posted by N3IFD
by the way
would not 060% modulation = 6% modulation
calling the phone part of the band 80 or 75 is pretty much interchangeable
sometimes i call the whole band 80 sometimes i call the phone band 75
anybody wanting to argue about it is just nit picking
AM on 80
many modern xceivers sound fine on AM
the days when some of the big gun AM ops would say
go way boy and come back with a real AM rig are over
run what you got
You would be welcome on AM with your current setup.
Originally Posted by KA0SOG
Check out the AM frequencies used and the monthly AM radio net on the first Wednesday.
Hope that helps.
Lloyd Colston KC5FM
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