I liked the R390a best of all the receivers I had, from the operating standpoint. It was stable, accurite, had a good IF out for the scope, detector output, muting. You did not have to guess the frequency like most other vintage receivers.
It did tend to break clamps on the gears, but other than that, I never had to do anything with it for 20 years of heavy use. It was a bit noisy, but not bad, jumping between 160 and 10 meters was not something you would do often on that receiver, even 160 to 40 was a workout. Its big, heavy and rackmount, and now, expensive. The NC300 or 303 was also good from what I remember, although not my idea of a nice looking radio. I thought the 75A4 was very poor on AM, but looked great. I always thought something like a 75S1 could make a good AM receiver with some work. An sx101 might be good, I had a Drake R4c, to narrow for AM, if people were off frequency, you could not hear them at all....and people seem to be off frequency on AM a LOT! I sold the R390a and built my own receiver, which on 160, 80 and 40 meters works much better than the R390a. A good AM receiver is really very simple, unless you want it to do all bands. For 160, 80 and 40 meters, you do not need any sort of RF amp stage, a simple high Q link coupled tuned input works great, a LO and mixer, 2 stages of IF amplifcation, a hifi detector, some AGC, an S meter amp, and a 455KHz xtal osc for a bfo. I used kiwa filters, which work like Collins mechanical filters, and a digital freq counter with a 455 KHz offset that reads the actual frequency. So its small, light, accurite,stable, low noise, hifi. You can also do tricks so when you change bands, the receiver is tuned to 1880, 3880, and 7290. So far, I have not found a receiver that sounds better on just AM, no sync detector or anything fancy, but its better than the sdr-iq was, or the icom pro3, r390a, etc. Brett N2DTS ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected]/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: [email protected] To unsubscribe, send an email to [email protected] with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
