Re: [Elecraft] [K3] RX audio distorted on FM
Yes, that is normal. When you switch to FM you are listening to a much wider portion of the band you are on. 73, Tom Amateur Radio Operator N5GE ARRL Lifetime Member QCWA Lifetime Member 35102 On Thu, 24 Nov 2011 22:50:37 -0800, Pete-Astound is2d...@astound.net wrote: One question I still have though is that with an antenna hooked up and listening on either 10 or 6 meters when the band is quiet (night time with the pre-amp and attenuator off), does the background static get at least twice as loud if not more when you go from any of the modes to FM? [snip] __ 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] [K3] RX audio distorted on FM
Pete I confirm it's normal and common with most rigs. But if you don't like the background noise on FM you can use the squelch control to cut it out. Careful setting of the squelch will ensure no background noise but as soon as a weak station is received it will break the squelch and you will hear it. John G4ZTR -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of n...@n5ge.com Sent: 25 November 2011 08:13 To: elecraft@mailman.qth.net Subject: Re: [Elecraft] [K3] RX audio distorted on FM Yes, that is normal. When you switch to FM you are listening to a much wider portion of the band you are on. 73, Tom Amateur Radio Operator N5GE ARRL Lifetime Member QCWA Lifetime Member 35102 On Thu, 24 Nov 2011 22:50:37 -0800, Pete-Astound is2d...@astound.net wrote: One question I still have though is that with an antenna hooked up and listening on either 10 or 6 meters when the band is quiet (night time with the pre-amp and attenuator off), does the background static get at least twice as loud if not more when you go from any of the modes to FM? [snip] __ 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 __ Information from ESET NOD32 Antivirus, version of virus signature database 6657 (2024) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 6657 (2024) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ 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] [K3] RX audio distorted on FM
Morning All, Sounds good and makes total sense.. Thank you for the responses.. Pete - WD6DKW __ 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] [K3] RX audio distorted on FM
Hi Tom: Very true. And, another factor is that most FM receiver IF circuits run the circuit gain at maximum. The resultant signal becomes distorted, but only in the sense that amplitude variations are totally removed. No matter, of course, since you want to detect the - frequency- variations (it's FM, after all). So, without using a squelch circuit to mute the audio, it's going to sound much louder. In fact, most squelch circuits use that broad-band noise to determine that a signal is -not- on the frequency. When a signal shows up, the receiver's AGC will detect that and turn the max gain down. The difference in levels between the empty frequency and one with a user on it, opens the squelch, and then you hear the station. When the incoming station is full quieting... it's signal is so strong that the IF gain is pushed down so much that the detected audio is quiet.. i.e. no additional band noise.. just the clean audio to your speaker. Same deal with FM broadcast receivers. 73 de Ray K2ULR On Nov 25, 2011, at 3:12 AM, n...@n5ge.com wrote: Yes, that is normal. When you switch to FM you are listening to a much wider portion of the band you are on. 73, Tom Amateur Radio Operator N5GE ARRL Lifetime Member QCWA Lifetime Member 35102 __ 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] [K3] RX audio distorted on FM
Actually, no, not for FM. Just as you say, most FM receiver IF circuits run the circuit gain at maximum. Also, a conventional FM receiver IF contains one or more limiter stages. Quieting is not a function of reduced IF gain - it is a function of the limiter. Quieting is observed as signal strength rises past the point where limiting begins, and full quieting occurs at the point at which the signal is strong enough to saturate the limiter so that no AM component remains. Bob NW8L When the incoming station is full quieting... it's signal is so strong that the IF gain is pushed down so much that the detected audio is quiet.. i.e. no additional band noise.. just the clean audio to your speaker. Same deal with FM broadcast receivers. __ 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] [K3] RX audio distorted on FM
HI Bob: Yeah... that's what I meant! :) There is that point where there is no further signal gain is possible.. i.e. hard limiting. So, you are quite correct. Thanks! 73 de Ray K2ULR On Nov 25, 2011, at 12:18 PM, Bob Cunnings wrote: Actually, no, not for FM. Just as you say, most FM receiver IF circuits run the circuit gain at maximum. Also, a conventional FM receiver IF contains one or more limiter stages. Quieting is not a function of reduced IF gain - it is a function of the limiter. Quieting is observed as signal strength rises past the point where limiting begins, and full quieting occurs at the point at which the signal is strong enough to saturate the limiter so that no AM component remains. Bob NW8L When the incoming station is full quieting... it's signal is so strong that the IF gain is pushed down so much that the detected audio is quiet.. i.e. no additional band noise.. just the clean audio to your speaker. Same deal with FM broadcast receivers. __ 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
[Elecraft] [K3] RX Audio Distorted on FM
Happy Thanksgiving to All, Just installed the KFL3B-FM Filter to my older K3. Tuning around on 10 this morning I heard a station, but things just didn't sound quite right. I fired up the 817 and found that the transmit audio sounds great, but the receive audio sounds distorted as though it were being overdriven. I've update all the firmware and haven't been able to find any references to receive audio. Any suggestions? Thanks.. Pete - WD6DKW __ 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] [K3] RX Audio Distorted on FM
Pete, Please tell us the rest of the story. Do you have the 2.7/2.8 filter set for SSB reception, or are you trying to use the FM filter for SSB reception? If you moved the 2.7/2.8 kHz filter to a different slot, you must tell the K3 firmware where it is now. K3 Utility simplifies the process, but you still have to tell it which filter is in which position. 73, Don W3FPR On 11/24/2011 6:06 PM, Pete-Astound wrote: Happy Thanksgiving to All, Just installed the KFL3B-FM Filter to my older K3. Tuning around on 10 this morning I heard a station, but things just didn't sound quite right. I fired up the 817 and found that the transmit audio sounds great, but the receive audio sounds distorted as though it were being overdriven. I've update all the firmware and haven't been able to find any references to receive audio. Any suggestions? Thanks.. Pete - WD6DKW __ 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
[Elecraft] [K3] RX audio distorted on FM
Good evening All, Well I've had a chance to play around some more and now found that at least with a local signal from the 817 the audio distortion on FM receive seems to have mysteriously disappeared. One question I still have though is that with an antenna hooked up and listening on either 10 or 6 meters when the band is quiet (night time with the pre-amp and attenuator off), does the background static get at least twice as loud if not more when you go from any of the modes to FM? Seems like it did not does this when I had just the 2.7 filter installed into slot 3. Tried turning the slot 1 filter off, but it still defaults to it when in FM mode so I can't compare unless I go back in and physically take that filter out. Thanks for your responses.. Pete - WD6DKW __ 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
