Discussion in 'Amplitude Modulation' started by N2DTS, Oct 5, 2021.
That is somewhat true, the usual suspect list is small and getting smaller.
Sitting in the shack, listening in on the texoma traders net with my drake 2B ... sitting in 3.6 khz selectivity.... the chicago crew is 5 khz away, pounding in ... and I don't hear them despite the big iron that most run. 3.6khz is a little narrow, i agree, but it works.... it's too bad there's not more action in the 3600-3800 extra portion. But the same buzzards who run AM are the ones who never upgraded in protest to incentive licensing ... or so it seems.
On the contrary Joe. I did just that years ago so I could escape the so called AM 'ghetto'. However finding OPS in that section can be challenging. Part of it is my problem since my current rig is 'rock bound', but at least I take comfort in knowing that I am not 'drifting' all over the place!
I never bothered to upgrade for no particular reason, but a few years ago I took the test at a fest.
I got something like a 60% as it was all digital mode and space com type questions and I never did any of that.
My antenna's are cut for 7290 and 3880, they are somewhat broad banded but I would need to trim them to the center.
Plus, since I have built all my own equipment, receivers, transmitters, vfo's, audio processor, antenna's, I expect an honorary extra.....
Maybe it got lost in the mail?
Some of the 3890 group go down to 37** in the evenings and have an AM roundtable. I can't remember the frequency.
I heard a little of the traders net on my way to the grocery store this morning.
[QUOTE="K7JOE, post: 5991843, member: 52674"]
...20M is too crowded for AM...slop buckets galore...
I have called CQ I can't tell you how many times between 14.320 and 14.330 at various times of the day and no one answers.
The last QSO I had on 20 meters was with N6YW (Bill) about 4 years ago.
I gave up operating 20m AM decades ago, although my HF-300 rig built circa 1971 will cover it. Great for one-on-one QSOs, but for roundtables, forget it. Always ended up listening to dead air, QRM, or band noise for long periods of time while the station transmitting was skipping over. A one-on-one QSO nearly always quickly devolved into a roundtable as new stations would break in, and eventually, one of us couldn't hear a trace of the breaking station. Participants in 20m roundtables should keep transmissions short.
K7JOE said: "...20M is too crowded for AM...slop buckets galore..."
From what I have heard the very few times I have attempted to listen on 20m recently, it's less crowded above 14300. 14285/286 has been a lost cause for years if not decades.
With some of the Drake stuff you have to tune off to the side to get the highs, not really a problem...
The later rigs can sound great on AM if you mod them for screen modulation or reduce the controlled carrier effect.
The R4B ansd R4C receivers are really tight and maybe too narrow stock for good AM.
I had one in the old days and if someone was much off frequency you could not hear them...
The conditions you cite are not one of transmitted passband, but one of spacing among AM conversations on the dial.
Not only can and should we also roost in the low 3700s, but we do, with regular daily activity on 3705 & 3725 weekday mornings in the Eastern U.S. time zone.
You have been active for at least as long as myself, and you probably are aware that there has been an unexplained tendency among AMers to set up shop with spacing at 5Kc. I never did understand where that misguided mentality came from, but it exists, and any of us have the ability to break away from this uncomfortable distance from the neighbors.
At the high end of 40 meters, I set up at 7286. This not only establishes an AM presence, but it leaves enough room for another AM QSO above, on whatever frequency the operator feels comfortable against the licensed limit of 7300.
On 10 meters, my last experience was Cycle 23. AM QSOs were reliably spaced and persistently found from 28.990 through 29.200, every 10Kc. That's an ideal spacing for AM, and a well-populated band for the mode shows the practice yields far higher enjoyment than trying to pack 10Kc into a 5Kc bag.
15 meters is now open regularly between North America and the UK. The Facebook page AM Amateur Radio Europe this morning has several audio recordings you may enjoy, with John, G3YPZ, and several American licensees. 21400 -21440 I think. I know John from 10 meters Cycle 23. Great company to spend time with on the radio.
THE ICOM IC-705 GIVES GOOD BASS!
It doesn't have a hard roll off at 200Hz. Brett, check your settings...With the Bass setting at +5, the –3dB point is at 60 Hz. The –6dB point is at 46 Hz. The –10dB point is at 41 Hz. Looking at the schematic, there are a couple of caps in the AF amplifier section that could be fatter. Changing those might improve the low end even more but as it is (right out of the box)... not too shabby. I'm listening to Classic Oldies AM 1250 WMTR and the bass players are thumping away!
Also of note is the AM RX processing latency is close to zero. It's difficult to hear any delay when listening simultaneously with an analog receiver.
Disclaimer: All measurements were made by an easily distracted ham radio operator with crappy test equipment.