Rick, While jumpering out the filter may increase the receiver response, there are too many other things going on to make a solid judgement.
Receiver problems of that nature can be deceiving unless you do Signal Tracing. You apparently have a signal generator with a calibrated output, and I suggest you turn to the Troubleshooting appendix in the back of the manual and go through the Receiver Signal Tracing procedure. If you are monitoring the RF voltage with an oscilloscope, multiply the expected readings by 2.8 for the 'scope P-P RF voltage - if you have no 'scope, now is a good time to build the RF probe from the parts supplied with your K2 kit. If I guessed wrong on your signal generator capability, you can build the oscillator shown in the manual appendix - it works very well. As Eric indicated, Gary has been gone, and he handles most of the K2 support issues. 73, Don W3FPR On 8/3/2011 8:14 PM, Rick Beatty wrote: > Hi To the group -- this is my second time around, having 2 K2's -- as I > build the second one I have run into an issue that some of you might have > seen, or heard of. > > All of the checks and tests required up to and including phase two ( > receiver checkout) are nominal -- however, I find that the signal they ask > for you to check, at around 7.0Mhz is not there -- and signals off of an > antenna are also weak. I confirmed this by injecting a signal into the > antenna port and determined that the receiver is about a -70 to -75 db and > not the normal -100. > > However, here is the kicker -- if I jumper from w2 to w3 the sensitivity > comes to normal and the 7.0Mhz signal is good and solid as well as signals > from the antenna. > > What I want to know is what to do to fix it. This little test has me > thinking that that crystal filter is bad. > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
