There might be 2 distinct problems: a) the bandwidth of the signal you think you have and b) splatter caused by over-modulating and over-driving.
Starting with a wide-ish signal of say 6 or 7kHz, ie dsb full carrier might be ok in uncrowded bands, but add badly adjusted modulation and drive to another badly adjusted amplifier (a non-linear linear amplifier) and you've got double trouble that can be heard across the world even worse than over-driving ssb. Couple that with the sort of drift those boat-anchors are capable of and I can see why they have a bad reputation. All of which can be corrected by proper adjustment which takes more skill and understanding not now taught. David G3UNA > Fortunately the K3 is quite good on AM transmit, unlike legacy equipment > often used. I don't know about elsewhere, but here in the UK there are > 80m AM nets where some of the stations run original AM gear without any > additional audio filtering, one was measured at +/- 12 KHz by a fellow > ham with an SDR receiver. The operator seemed indifferent to the fact > his transmission was excessively wide and carried on regardless. The guy > who measured the wide signal used home built AM gear himself, but had a > multi-pole active filter of a similar specification to that used by > broadcast stations to achieve their "skyscraper" envelopes as seen on a > panoramic adapter or SDR receiver. > > The UK license has the clause "The bandwidths of emissions should be > such as to ensure the most efficient utilisation of the spectrum". > > 73 Dave, G4AON > K3/100 #80 > > Joe, W4TV wrote: > > Similarly, AM - except for legacy equipment - should be > limited to 6 KHz bandwidth. In other words, the maximum > modulating frequency should be set at 3 KHz - or no more than > 3200 Hz. > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
