SS "Strangenss"
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Hi,
First, FYI: this is cross-posted to the Elecraft reflector and the SKCC group. I "played" on the SS the weekend. Attained 63 contacts QRP (KX-1). I was mostly giving out points as I probably won't submit my log... But, anyway... While attempting to respond to a station, I was using a spectrum program so I knew I was on the calling stations frequency (in this case, I believe the KX-1 uses a 600 Hz offset - I've tested it with another radio and it seems correct). So, here's the "strange" part: If I zero beat the calling station, there was about a 1 in 10 chance they'd hear me! If, on-the-other-paw, I tuned to about 450 or 500 Hz, they seemed to hear me okay! And this included stations who were answering on their exact frequency! I first noted this when calling one station, but heard my call at about a 100 Hz tone (which meant my sig was 500 Hz below him). I thought, "Huh?" Well, it works out well, because the bandwidth filters seem centered on about 450 Hz when at it's narrowest, but the question is, why was this? I mean I fully expected stations to be listening on their own frequency first, then offsets. Or, am I missing something? {'-) Regards, kurtt Kurt Pawlikowski, AKA WB9FMC The Pinrod Corporation [hidden email] (773) 284-9500 http://pinrod.com _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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Kurt,
Check your KX1 menu setting for the STP parameter - the KX1 should offset by that amount during transmit. When you said "I knew I was on the calling stations frequency" - do you mean that you tuned the station to the same audio frequency as your STP menu parameter? If so, then your transmit signal should be right on the other stations frequency. The menu setting tells the firmware how much to offset but there is an expectation that you will also tune the other station to that same audio pitch. Be aware that many other operators do not know how to zero beat, nor what it really means - they have been using transceivers too long. In fact, I recall one ham who stated "I can hear him in my receiver, so he will hear me!" Maybe it is time for zero beating lessons on the air (sorry for the rant). You may want to run a test if you have any doubts - tune in a signal on another receiver and tune the same signal on your KX1 - then without changing the KX1 VFO, connect a dummy load and transmit while listening to your signal in the other receiver - if everything is correct, you should hear your signal at the same note as the original signal you tuned to. 73, Don W3FPR Kurt Pawlikowski wrote: > Hi, > > First, FYI: this is cross-posted to the Elecraft reflector and the > SKCC group. > > I "played" on the SS the weekend. Attained 63 contacts QRP (KX-1). > I was mostly giving out points as I probably won't submit my log... > But, anyway... > > While attempting to respond to a station, I was using a spectrum > program so I knew I was on the calling stations frequency (in this > case, I believe the KX-1 uses a 600 Hz offset - I've tested it with > another radio and it seems correct). So, here's the "strange" part: If > I zero beat the calling station, there was about a 1 in 10 chance > they'd hear me! If, on-the-other-paw, I tuned to about 450 or 500 Hz, > they seemed to hear me okay! And this included stations who were > answering on their exact frequency! I first noted this when calling > one station, but heard my call at about a 100 Hz tone (which meant my > sig was 500 Hz below him). I thought, "Huh?" Well, it works out well, > because the bandwidth filters seem centered on about 450 Hz when at > it's narrowest, but the question is, why was this? I mean I fully > expected stations to be listening on their own frequency first, then > offsets. Or, am I missing something? {'-) > Elecraft mailing list Post to: [hidden email] 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 |
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Don,
Humm... Well, I did a few tests and, unless I've messed up a lot (Who? Me?!!), looks like the transmit frequency is *not* offset by 600 (as the STP adjustment indicated). Looks like it's more like 200 Hz. And, if I change the offset to 500 (lowest it'll go), I'm not sure there is any change. I'll have to play with this more. But, assuming my numbers are about right, I'm fairly sure there isn't anything I can do about it... No? Regards, kurtt Kurt Pawlikowski, AKA WB9FMC The Pinrod Corporation [hidden email] (773) 284-9500 http://pinrod.com Don Wilhelm wrote: > Kurt, > > Check your KX1 menu setting for the STP parameter - the KX1 should > offset by that amount during transmit. > > When you said "I knew I was on the calling stations frequency" - do > you mean that you tuned the station to the same audio frequency as > your STP menu parameter? If so, then your transmit signal should be > right on the other stations frequency. The menu setting tells the > firmware how much to offset but there is an expectation that you will > also tune the other station to that same audio pitch. > > Be aware that many other operators do not know how to zero beat, nor > what it really means - they have been using transceivers too long. In > fact, I recall one ham who stated "I can hear him in my receiver, so > he will hear me!" Maybe it is time for zero beating lessons on the > air (sorry for the rant). > > You may want to run a test if you have any doubts - tune in a signal > on another receiver and tune the same signal on your KX1 - then > without changing the KX1 VFO, connect a dummy load and transmit while > listening to your signal in the other receiver - if everything is > correct, you should hear your signal at the same note as the original > signal you tuned to. > > 73, > Don W3FPR > > Kurt Pawlikowski wrote: >> Hi, >> >> First, FYI: this is cross-posted to the Elecraft reflector and the >> SKCC group. >> >> I "played" on the SS the weekend. Attained 63 contacts QRP (KX-1). >> I was mostly giving out points as I probably won't submit my log... >> But, anyway... >> >> While attempting to respond to a station, I was using a spectrum >> program so I knew I was on the calling stations frequency (in this >> case, I believe the KX-1 uses a 600 Hz offset - I've tested it with >> another radio and it seems correct). So, here's the "strange" part: >> If I zero beat the calling station, there was about a 1 in 10 chance >> they'd hear me! If, on-the-other-paw, I tuned to about 450 or 500 Hz, >> they seemed to hear me okay! And this included stations who were >> answering on their exact frequency! I first noted this when calling >> one station, but heard my call at about a 100 Hz tone (which meant my >> sig was 500 Hz below him). I thought, "Huh?" Well, it works out well, >> because the bandwidth filters seem centered on about 450 Hz when at >> it's narrowest, but the question is, why was this? I mean I fully >> expected stations to be listening on their own frequency first, then >> offsets. Or, am I missing something? {'-) >> > Elecraft mailing list Post to: [hidden email] 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 |
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