It fixes both sides. The opposite spur was weaker and less problematic since it was lower than the image in every case tested.
Fewer than ten owners complained to Flex. It is fully realized how many heard the problem and how many competitors laughed behind their hands or even out in the open. I know Bill remembers as I do, how many years we suffered, without so much as an acknowledgement of the Yaesu key click problem and we all bore 100% of the cost over multiple models with their "everyone will continue to buy" attitude. This is exemplary behavior on the part of Flex in comparison. I listened to mine, and I listened to W5ZN while I was there, on both sides of the channel. It much lower. I will not claim numbers. W5ZN is measuring and will publish numbers independent of mine. That is as it should be. My opinion? It is fixed once and for all. Bob N4HY On Wed, Mar 2, 2011 at 6:56 AM, Bill Tippett <btipp...@alum.mit.edu> wrote: > K5SDR wrote: > > > There has been some discussion today about an ECO that addresses a > potential > spur issue on 160m CW on the FLEX-5000. We have developed a hardware > modification to the 160m transmit filter section in response to a half > dozen > customer reports of a spur 2.4 kHz above the CW transmit frequency. > > > This is only an issue if the station is running "legal limit" power CW on > 160m with very large antenna arrays. In the "legal limit" case the CW spur > would still be only on the order of 6 mW (we have measured approximately > -53 > to -57 dBc), which might be heard by other similar "big gun" stations with > quiet antennas. On 160m SSB or AM it is really a non issue. > > While I applaud Flex for finally addressing this issue, there > are a couple of points I'd like to add to the above: > > 1. I believe the spur is on both sides of the fundamental. At least > W5ZN's > definitely was *below* his fundamental when I first noticed it in October > 2009. > Joel was calling TX3A up 2.4 kHz and his spur was zero beat with the DX > station. > He was so strong I thought he was accidentally operating out of split mode. > > 2. A "half dozen reports" is a little misleading in terms of the impact on > others. For someone running legal power to full size antennas, 160 signal > strengths are typically S9+40 (-33 dBm). A 55 dB spur below that would be > ~S6 (-88 dBm) on most receivers and about 30-40 dB above the noise floor. > Since > many DX signals on 160 are at or even below the noise floor, a single > station > with a spur can cause problems for everyone else on the band. Of course it > doesn't cause a problem for him since he can't hear it while he's > transmitting. > > If you run full power on Topband, PLEASE make this mod for the sake > of > the other hundreds of stations sharing 160 with you. > > 73, Bill W4ZV > > _______________________________________________ > FlexRadio Systems Mailing List > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > Knowledge Base: http://kc.flexradio.com/ Homepage: > http://www.flexradio.com/ > _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
