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Total 6 documents matching your query.

1. Topband: Collins R390 and 75A4 on 160m (score: 1): Author: sire@iinet.net.au (Steve Ireland); Date: Sat, 03 Aug 2002 12:07:52 +0800; G'day all, I have a 1955-vintage Collins R390 here and am curious about whether anyone on the reflector has done any comparisons on 160m with the 75A4 - or what anyone who has a R390 thinks of its pe; /archives//html/Topband/2002-08/msg00013.html (7,932 bytes)
2. Topband: Collins R390 and 75A4 on 160m (score: 1): Author: btippett@alum.mit.edu (Bill Tippett); Date: Sat, 03 Aug 2002 07:06:08 +0100; The referenced page from Sherwood Engineering has comparisons of several vintage receivers including the R390 but unfortunately not the 75A4. Since the R390 was a military receiver and the 75A4 was s; /archives//html/Topband/2002-08/msg00014.html (8,635 bytes)
3. Topband: Collins R390 and 75A4 on 160m (score: 1): Author: btippett@alum.mit.edu (Bill Tippett); Date: Sat, 03 Aug 2002 07:14:47 +0100; Oops, I forgot to show the R390 Blocking Dynamic Range of 130 dB. It is meaningless anyway since the measurement was done at 100 kHz spacing compared to 5 kHz for the ARRL data. 73, Bill W4ZV; /archives//html/Topband/2002-08/msg00015.html (7,084 bytes)
4. Topband: Collins R390 and 75A4 on 160m (score: 1): Author: n1eu@hotmail.com (Barry N1EU); Date: Sat, 03 Aug 2002 08:05:25 -0400; Steve, I believe the 500 and 800hz mechanical filters available for the 75A4 have much steeper skirts than the 100 and 1000hz filters of the R-390A. The 75A4 also featured passband tuning and a notch; /archives//html/Topband/2002-08/msg00016.html (9,146 bytes)
5. Topband: Collins R390 and 75A4 on 160m (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Sat, 03 Aug 2002 10:22:51 +0100; When I enquired about the 75A4 some time ago, several people replied that despite its reputation, it has very poor dynamic range (see the following message). I don't know about the R390. 73 de Mike,; /archives//html/Topband/2002-08/msg00018.html (8,654 bytes)
6. Topband: Collins R390 and 75A4 on 160m (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 4 Aug 2002 16:30:44 -0400; I have both early and late R390's (the late is a 390A). That does not make me an expert, but at least I have looked carefully at the two units. Neither is all that good for BDR or IM3DR, and both ar; /archives//html/Topband/2002-08/msg00019.html (8,447 bytes)

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