At 03:23 PM 5/6/2007 -0400, you wrote: >I think Patrick meant a 390A Charles, and it probably is a peak limiter like >the others, but mine works one hundred times better in the 390A than any >other I've got in many different boatanchors, especially in the 388 and >SP-600's. I just turn it on to the minimum and it doesn't seem to chop the >peaks very much if at all but the noise is way below the audio level of the >station, works very well in mine. I've got a couple of 390's but have to >change the PTO in one of them before I can use it and the other also needs >some work, > >Bob Young >analog, MA >KB1OKL >
OK, Bob. Did you read after my observations about R-390()/URR's noise limiter, the right way to tune in 2-KC bandwidth for 1-kHz splits? Instead of "straddling" your desired station in the center of the 2-KC bandwidth (which puts the "even" channel at the edge of, and inside the passband), tune the R-390A AWAY from the "even" channel so that your "split" is at the high or low edge of the passband. Then the excellent shape factor of a good mechanical filter really shines. 2 kHz is about optimal if that's all you have. But the R-390A's 4- KC bandwidth is better for intelligibility, in many instances. Back in my last year of the Navy (1972, in Coronado, CA), I bought a nice GR-78 communications receiver kit from Heath Co. I added an I-F jack (455 kHz) to the back apron, and bought a Collins 2.1-kHz mechanical filter. Built a "Q-5er" receiver tail end around that mechanical filter. Took them to the Philippines 1972-1973. For DXing, I used the "Q-5er." The audio was somewhat muffled, but Collins mechanical filters were (and still are) expensive, and I didn't want to buy a 4-kHz mechanical filter. For general listening, I listened through the GR-78's I-F and audio strip. So you see, you don't need a phasing control on an R-390A. Know what I mean, Vern? Trees at yah! Charles A Taylor, WD4INP Greenville, North Carolina _______________________________________________ IRCA mailing list [email protected] http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: [email protected]
