Thanks for the heads up, I will watch for that on 144MHz here. Without a mast head preamp I need the internal preamp on the 14 MHz IF with my KX3 plus transverter. I suspect once I put the mast head preamp up that for best dynamic range and still good overall NF I won't need the preamp in the KX3. I'm pretty sure I modelled that a while ago anyway.
73 David Anderson GM4JJJ > On 5 Jun 2015, at 16:25, Andrew Hebden <[email protected]> wrote: > > Harry, > > Be aware that the preamp does not come back on. I encounter this problem > periodically when contesting in the UK (6m UKAC) as I have 2 very strong > stations nearby and while tuning through the band if I happen to be on > frequency when one of them transmits AND our antennas are pointing roughly at > each other the KX3 does the full close down as David describes. > On odd occasions I can be working someone near the noise level and one of the > locals fires up close to my frequency, this shuts everything down and by the > time I've recovered the DX station can have gone. I am looking into using an > external 6m preamp but I will probably experience the same issue. > > Best of luck. > Andrew > G8BYB > > -----Original Message----- > From: Elecraft [mailto:] On Behalf Of David Anderson > Sent: 05 June 2015 08:15 > To: Elecraft Reflector > Subject: Re: [Elecraft] KX3 Receiver Overload Protection? > > > Harry, > > Yes it appears to have > > from Page 43 of the owners manual: > > > > HI RFI warning, preamp turns off, or RX icon turns on: The KX3 protects > itself from high received signal levels. First, the preamp is turned off, if > it was on. (You may be able to avoid this by using the 10-dB preamp rather > than the 20-dB preamp on the current band. See MENU:PREAMP.) The second step > taken by the KX3, if necessary, is to turn on a 15-dB attenuator stage in the > I.F. section, ahead of the receiver s A- to-D converter. The receive overload > icon (RX), near the ANT icon, will turn on. Once signals return to a safe > level for 5 seconds, this attenuator will be turned back off. Also see COR > (next item). > > ? Carrier-operated relay activated (a relay is heard, and the RX icon turns > on): The carrier-operated- relay (COR) may be activated due to the signal > from a nearby transmitter. This is usually due to close proximity between > your antenna and the other station s antenna. The COR is actually the relay > for the present low-pass filter. When the relay opens, signals will drop by > 40 to 60 dB, protecting the KX3. The relay will close again shortly after the > signal drops. If the COR is being repeatedly activated, try moving the > antennas farther apart. You can also increase the COR threshold, at your > discretion; see MENU:COR LVL. > > > > 73 > > David Anderson GM4JJJ > >> On 5 Jun 2015, at 03:16, Harry Yingst via Elecraft >> <[email protected]> wrote: >> >> Does the KX3 have any form of Reciever Overload protection like the K3 does? > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html Message > delivered to [email protected] > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
