Re: [Elecraft] KBPF3 usefulness or effectiveness?
Hi Guy et al, I was more or less curious about how it worked. I do hear a relay clicking somewhere around 7400 kHz, but I do not recall seeing or hearing an appreciable change in s-meter readings or AF levels. I'm sure it works fine in the lower broadcast bands though. James K2QI On Mon, Dec 28, 2009 at 11:26 AM, Guy Olinger K2AV wrote: > If the AGC is being used, any difference would be seen in the S-meter, > not the AF output, unless you live in an extremely quiet location and > you're trying to copy 40m BC during the day. > > My KBPF3 switches in at 7.385. If you turn the AF gains to minimum in > a quiet room, you will hear the relay kick in/out the KBPF3 as you > tune across the switch-in points. Mine switches before the ham band > filter adds any noticeable loss, as there is no sudden change in any > level. Very smooth. > > Were you having trouble hearing a station or just curious about the > way it operates? > > 73, Guy. > __ 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
Re: [Elecraft] KBPF3 usefulness or effectiveness?
FWIW, mine switches in at 7410 KHz, increasing the signal by 7 or 8 dB. I compared the background noise level below and above 7410 using the K3's internal dBV function, with AGC off. 73, Drew AF2Z On Mon, 28 Dec 2009 11:26:04 -0500, Guy. wrote: >If the AGC is being used, any difference would be seen in the S-meter, >not the AF output, unless you live in an extremely quiet location and >you're trying to copy 40m BC during the day. > >My KBPF3 switches in at 7.385. If you turn the AF gains to minimum in >a quiet room, you will hear the relay kick in/out the KBPF3 as you >tune across the switch-in points. Mine switches before the ham band >filter adds any noticeable loss, as there is no sudden change in any >level. Very smooth. > >Were you having trouble hearing a station or just curious about the >way it operates? > >73, Guy. > __ 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
Re: [Elecraft] KBPF3 usefulness or effectiveness?
If the AGC is being used, any difference would be seen in the S-meter, not the AF output, unless you live in an extremely quiet location and you're trying to copy 40m BC during the day. My KBPF3 switches in at 7.385. If you turn the AF gains to minimum in a quiet room, you will hear the relay kick in/out the KBPF3 as you tune across the switch-in points. Mine switches before the ham band filter adds any noticeable loss, as there is no sudden change in any level. Very smooth. Were you having trouble hearing a station or just curious about the way it operates? 73, Guy. On Mon, Dec 28, 2009 at 3:56 AM, Stephen Prior wrote: > James > > I suspect that 7.5MHz is far too close to the existing 40m bandpass > filtering for you to notice any difference between it and the KBPF3. I can't > try it here as I only have the single receiver, but if you to look around > 12MHz for example I expect you would detect a significant difference. > > 73 Stephen G4SJP > K3 #980 > > > On 28/12/2009 02:19, "James Sarte" wrote: > >> >> Hello Elecrafters, >> >> When I assembled my K3 I installed the KBPF3 module in the sub receiver >> figuring that I'd use the sub for SWL. However, I was thinking about moving >> it back to the main receiver in order to take full advantage of the >> synchronous AM detection feature. What I noticed though was that I can't >> really seem to tell if the KBPF3 makes a difference when listening to >> out-of-band stations. >> >> For example, tuning around tonight I came across a strong SW station on 7505 >> KHz. Logic tells me that the sub receiver's AF output should be >> significantly clearer, perhaps louder, than that of the main receiver. >> Going back and forth between them doesn't seem to show any differences in >> perceived audio quality though. >> >> So, I'm curious now if there are any tests I can perform that would >> demonstrate the effectiveness of the KBPF3 module. >> >> Thank you for your valued input. >> >> Vy 73 de James K2QI > > > > > __ > 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 > __ 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
Re: [Elecraft] KBPF3 usefulness or effectiveness?
Thanks Dave - I had forgotten about the broadcast AM stations below 1 kc. I'll check that out. By the way (and this is addressed to Wayne), any chance sync-am can be applied to the sub receiver? 73 de James K2QI -Original Message- From: David Olean [mailto:k1...@metrocast.net] Sent: Sunday, December 27, 2009 11:08 PM To: James Sarte Subject: Re: [Elecraft] KBPF3 usefulness or effectiveness? I do know that it makes a big difference on the broadcast band. Tune in a station under 1000 kHz. It will be much louder on the antenna in jack on the KXV3 than on the main antenna jack. 7500kHz might not be far enuf away from the ham band to make much difference. I noted a big improvement on the BC band with the KBPF3 over that without it. Easy to check there with plenty of stations. Dave K1WHS __ 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
Re: [Elecraft] KBPF3 usefulness or effectiveness?
James I suspect that 7.5MHz is far too close to the existing 40m bandpass filtering for you to notice any difference between it and the KBPF3. I can't try it here as I only have the single receiver, but if you to look around 12MHz for example I expect you would detect a significant difference. 73 Stephen G4SJP K3 #980 On 28/12/2009 02:19, "James Sarte" wrote: > > Hello Elecrafters, > > When I assembled my K3 I installed the KBPF3 module in the sub receiver > figuring that I'd use the sub for SWL. However, I was thinking about moving > it back to the main receiver in order to take full advantage of the > synchronous AM detection feature. What I noticed though was that I can't > really seem to tell if the KBPF3 makes a difference when listening to > out-of-band stations. > > For example, tuning around tonight I came across a strong SW station on 7505 > KHz. Logic tells me that the sub receiver's AF output should be > significantly clearer, perhaps louder, than that of the main receiver. > Going back and forth between them doesn't seem to show any differences in > perceived audio quality though. > > So, I'm curious now if there are any tests I can perform that would > demonstrate the effectiveness of the KBPF3 module. > > Thank you for your valued input. > > Vy 73 de James K2QI __ 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
[Elecraft] KBPF3 usefulness or effectiveness?
Hello Elecrafters, When I assembled my K3 I installed the KBPF3 module in the sub receiver figuring that I'd use the sub for SWL. However, I was thinking about moving it back to the main receiver in order to take full advantage of the synchronous AM detection feature. What I noticed though was that I can't really seem to tell if the KBPF3 makes a difference when listening to out-of-band stations. For example, tuning around tonight I came across a strong SW station on 7505 KHz. Logic tells me that the sub receiver's AF output should be significantly clearer, perhaps louder, than that of the main receiver. Going back and forth between them doesn't seem to show any differences in perceived audio quality though. So, I'm curious now if there are any tests I can perform that would demonstrate the effectiveness of the KBPF3 module. Thank you for your valued input. Vy 73 de James K2QI -- 73 de James K2QI __ 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
