RE: [Elecraft] XG1 Results with K1 s/n 1018
> 2) Should I stop trying to figure out why the speaker > volume is so and low and just use headphones? When I touch > pin 1 of mixer U2, I get a loud blast from the speaker, so > I'm convinced the audio chain is fine. I'm just not sure if > the RF level into it is high enough. I have the K1-4 filter > board and am sure I've peaked it for best results. > Mark, Did you ever try another headphone? It must have the correct impedance and there are diffences of > 40 dB between different headphones. 72/3 de Peter, DL2FI www.qrpproject.de ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] XG1 Results with K1 s/n 1018
Hi, Clark: It sounds like you are dealing with two different issues: Minimum Discernable Signal (MDS) measurement and raw audio power. The MDS that you are measuring with the XG1 should not be associated with how much racket you get in the speaker or phones. A very poor receiver can make a lot of noise! It all depends upon the amount of amplification the receiver has, which is quite different from the sensitivity. First, are you using a bandwidth of 500 Hz for the MDS measurement using the XG1? The MDS you get will depend a lot upon that bandwidth. Since you are measuring the receiver's response to an unmodulated signal and comparing it to the noise with no signal, the narrower the bandwidth, the less noise energy you will detect with the XG1 turned off, so the better the calculated MDS. CW receiver MDS is commonly calculated using a receiver bandwidth of 500 Hz so we're comparing apples and apples when comparing two rigs. All that aside, the audio level is a wholly different problem. I do not own a K1 so I'll leave it to K1 owners to suggest remedies for that. Ron AC7AC ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] XG1 Results with K1 s/n 1018
Hello everyone! My first post to this august group. I've always suspected my K1 receiver to be a little weak because of very weak audio fro the speaker although headphone volume is fine. Not knowing whether it was an audio or RF problem, an XG1 was ordered and here are the results @ 7040Khz using the 1 microV setting and measuring the AC voltage at the speaker terminals per XG1 instructions: --XG1 ON: 104 mV --XG1 OFF: 12 mV Using the formula in the XG1 instructions: --R(atio) = 8.2 -- Log R = .9 -- 20 x Log R = 18 db -- MDS approximates -107- 18 = -125 dbm which is a little off the -130 dbm identified in the XG1 instructions. My questions are: 1) Are my results within range of what should be expected? When an antenna is attached, the noise rises significantly indicating to me that the receiver is working, but that is hardly an objective measurement. 2) Should I stop trying to figure out why the speaker volume is so and low and just use headphones? When I touch pin 1 of mixer U2, I get a loud blast from the speaker, so I'm convinced the audio chain is fine. I'm just not sure if the RF level into it is high enough. I have the K1-4 filter board and am sure I've peaked it for best results. BTW: I do have the internal battery option, so when I say speaker volume is very low, I'm referring to the speaker and top cover being in place. 73, Clark Macaulay KE4RQ ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
