Hi Tom Good information the cheap amp. Another model amplifier that has a cult following on the ham bands, especially with new hams is the HLA300. This amp is another IMD disaster. Without people like yourself who highlight these problems we not going to win the battle with these cheap garbage amps being used on the ham bands.
These amps seem very attractive to new hams who dont know any better. John --- On Thu, 4/15/10, Tom W8JI <[email protected]> wrote: > From: Tom W8JI <[email protected]> > Subject: Re: [Elecraft] Ten Tec never sounded so good! > To: "Gary Gregory" <[email protected]>, "lstavenhagen" > <[email protected]> > Cc: [email protected] > Date: Thursday, April 15, 2010, 4:10 AM > << On SSB it isn't so much the > folks on ESSB, although we > have a few of those > here also unfortunately, but rather the poorly adjusted 1KW > > plus amplifierrs > and badly adjusted audio that causes me to screw up my nose > > and do a quick > QSY..(:-))>> > > If we are every going to fix things we need to honestly > discuss the real problems. > > I have been doing a survey of ops on 20 and 40 meters with > > very bad signals, and nearly all the nasty signals were not > > high power. Most, after I broke in for a friendly chat, we > > running small amps and just mistuning or overdriving them. > > A significant number had "peaked" their radios up and were > > running a bit more output from a 100 watt radio. As a > matter > of fact a contestor who brought his FT1000MP's to me had > his > 100 watt radios screwed up to 130-140 watts, so this may be > > a more common practice then we think. I lowered his radios > > to 100 watts, and after a while when the radios came back > for another update they were back up to 130-140 watts > again. > At that power level the radios had IM3 in the -20 dB PEP > range, and products out to the 17th order were still > strong. > > For all those intent on boosting low power radios with a > cheap external PA, you can see measurements here: > http://www.w8ji.com/rm_hla-150_test.htm > > The very best the RM Italy amp gets on *any band at any > power* is about like a FT1000MP on the very WORSE band for > > the MP. > > There is no convincing people that our 100 watt radios at > 100 watts are barely acceptable as is, and that all these > little tricks that give another 1-2 dB more power can > increase splatter 15 dB or more. Worse yet, those cheap > illegal amplifiers that make 10-watt radios into 100 > watters > are going to be our undoing. > > 73 Tom > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
