Hi All, Yesterday morning on 75 meters we had at least 3 AM QSO's going on simultaniously. It was glorious! I heard QSO's on 3880, 85, and 90. At the same time there were SSB groups on 3878, and 3894.
At my QTH (central Texas) with my equipment, my SP-600 was useless. Yes I could use the 3Kc IF bandpass position, and tune off center to favor one sideband or another. As soon as the audio midrange would brighten up I'd hear QRM from an adjacent channel. Switching in the 8kc position resulted in a maddening array of signals besides the one I was wanting to hear. Then I switched to my Icom R-75 with 3 mechanical filters that are about 2.4, 3.5 and 6 khz in bandwidth. I could hear all 3 QSO's Q5 in AM with the 3.5 Khz filter, but it was no fun because the upper mids, and all highs were gone. Then tune off 1 Khz, and much better or turn on the synchronous detector, offset the passband tuning 2.4 khz (or 3.5), select the 2.4 filter (or 3.5), and golly Gee! Nice sounding AM on all 3 QSO's so long as you pick the better sideband. As the morning went on the QRM went away, and all we had was the traders net on 3890. Now the SP-600 ruled until the signals started dropping from daytime propagation kicking in. Now I was experiencing QSB, selective sideband fading, and occasional impulse line noise. Switch back to the R-75, turn on the noise blanker, and synchronous detector. Back to Q5 again!! This is not a tube versus solid state issue. Chuck Wa0zhh has a all tube HB receiver that has most of the modern features, and his receiver can probably blow the doors off my R-75. Chuck likes old style octal tubes too like the 6L7 in his noise blanker circuit. So how would a R-390 have done yesterday, or a NC-183D, Bretts HB tube receiver, or one of Darrel's HB tube receivers?? Just curious. Jim JKO -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.407 / Virus Database: 268.12.10/459 - Release Date: 9/29/2006 ______________________________________________________________ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected]
