Why no love for the 1khz CW filter?
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I just got my new (used) K3/10 in the mail yesterday and have been having a blast with it. It came with the 2.8 SSB filter and the 400 hz CW filter and I have been told by a couple friends on the air who also have K3s that that’s all I need.
But...nature abhors a vacuum. On my filter board. I was thinking seriously of the 1 khz CW filter because I do a lot of rag chewing on 80 meter CW and I would think that filter would cut down the noise a bit and the 500 hz 5 pole filter with the gentler sloping skirts and either the 200 or 250 for when things get really hairy. But maybe I’m off base here because I see very little talk of the 1 khz filter. I would love to hear thoughts on this. The guys are telling me forget all that and just get the KPA3A so they can hear me better. Which I will do just to quell the griping but I notice they are copying everything I send at 10 watts. I am looking at all the ideas you guys gave me a few days ago as well and thanks a lot for the suggestions. I think this may be the most fun I’ve ever had with a new rig. It’s just an amazing radio. Andy B W1AWB ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: Why no love for the 1khz CW filter?
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Andy,
For normal operating, you will not find the 1kHz filter any more beneficial than using the 2.7 (or 2.8) roofing filter. The ultimate selectivity is provided by the DSP bandwidth, and not the roofing filter. The reason for the more narrow roofing filter is to provide isolation from nearby strong signals that are within the roofing filter passband, but outside the DSP bandwidth. If strong signals come into the K3 outside theDSP bandwidth, but inside the roofing filter bandwidth, they can cause AGC "pumping" and reduce the overall sensitivity of the K3 receiver as a result. If you are operating in contest situations, or trying to respond to DX stations who are 'working a pileup', that extra bit of roofing filter may be needed, but for more casual operation, save your money. 73, Don W3FPR On 1/31/2017 9:07 PM, [hidden email] wrote: > I just got my new (used) K3/10 in the mail yesterday and have been having a blast with it. It came with the 2.8 SSB filter and the 400 hz CW filter and I have been told by a couple friends on the air who also have K3s that that’s all I need. > > But...nature abhors a vacuum. On my filter board. I was thinking seriously of the 1 khz CW filter because I do a lot of rag chewing on 80 meter CW and I would think that filter would cut down the noise a bit and the 500 hz 5 pole filter with the gentler sloping skirts and either the 200 or 250 for when things get really hairy. But maybe I’m off base here because I see very little talk of the 1 khz filter. I would love to hear thoughts on this. > > The guys are telling me forget all that and just get the KPA3A so they can hear me better. Which I will do just to quell the griping but I notice they are copying everything I send at 10 watts. > > I am looking at all the ideas you guys gave me a few days ago as well and thanks a lot for the suggestions. I think this may be the most fun I’ve ever had with a new rig. It’s just an amazing radio. > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by w1awb
Just turn the DSP Filter knob to whatever width you like.
Sent from my iPhone ...nr4c. bill > On Jan 31, 2017, at 9:07 PM, <[hidden email]> <[hidden email]> wrote: > > I just got my new (used) K3/10 in the mail yesterday and have been having a blast with it. It came with the 2.8 SSB filter and the 400 hz CW filter and I have been told by a couple friends on the air who also have K3s that that’s all I need. > > But...nature abhors a vacuum. On my filter board. I was thinking seriously of the 1 khz CW filter because I do a lot of rag chewing on 80 meter CW and I would think that filter would cut down the noise a bit and the 500 hz 5 pole filter with the gentler sloping skirts and either the 200 or 250 for when things get really hairy. But maybe I’m off base here because I see very little talk of the 1 khz filter. I would love to hear thoughts on this. > > The guys are telling me forget all that and just get the KPA3A so they can hear me better. Which I will do just to quell the griping but I notice they are copying everything I send at 10 watts. > > I am looking at all the ideas you guys gave me a few days ago as well and thanks a lot for the suggestions. I think this may be the most fun I’ve ever had with a new rig. It’s just an amazing radio. > > Andy B W1AWB > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: Why no love for the 1khz CW filter?
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In reply to this post by Don Wilhelm
Some of us deliberately operate with the roofing and DSP at the same
bandwidth, and with some care to get the skirts coincide. This provides the maximum possible drop at the edges, quite useful in a crowded contest. I want to hear equally well in a specific bandwidth, and then I want the selectivity skirts to drop as close to straight down as possible. Generally not needed for casual operation, and I will operate the casual QSO's sometimes with the DSP bandwidth at 700 or 800 Hz just because it "sounds better". and 1.8 kHz (the contesting SSB width) roofer behind it. Get people too close and I just tighten the width back up until I don't hear them any more. Generally people seem to give you 1 kHz spacing for casual. 73, Guy K2AV On Tue, Jan 31, 2017 at 9:26 PM, Don Wilhelm <[hidden email]> wrote: > Andy, > > For normal operating, you will not find the 1kHz filter any more > beneficial than using the 2.7 (or 2.8) roofing filter. > The ultimate selectivity is provided by the DSP bandwidth, and not the > roofing filter. > > The reason for the more narrow roofing filter is to provide isolation from > nearby strong signals that are within the roofing filter passband, but > outside the DSP bandwidth. If strong signals come into the K3 outside > theDSP bandwidth, but inside the roofing filter bandwidth, they can cause > AGC "pumping" and reduce the overall sensitivity of the K3 receiver as a > result. > > If you are operating in contest situations, or trying to respond to DX > stations who are 'working a pileup', that extra bit of roofing filter may > be needed, but for more casual operation, save your money. > > 73, > Don W3FPR > > On 1/31/2017 9:07 PM, [hidden email] wrote: > >> I just got my new (used) K3/10 in the mail yesterday and have been having >> a blast with it. It came with the 2.8 SSB filter and the 400 hz CW filter >> and I have been told by a couple friends on the air who also have K3s that >> that’s all I need. >> >> But...nature abhors a vacuum. On my filter board. I was thinking >> seriously of the 1 khz CW filter because I do a lot of rag chewing on 80 >> meter CW and I would think that filter would cut down the noise a bit and >> the 500 hz 5 pole filter with the gentler sloping skirts and either the 200 >> or 250 for when things get really hairy. But maybe I’m off base here >> because I see very little talk of the 1 khz filter. I would love to hear >> thoughts on this. >> >> The guys are telling me forget all that and just get the KPA3A so they >> can hear me better. Which I will do just to quell the griping but I notice >> they are copying everything I send at 10 watts. >> >> I am looking at all the ideas you guys gave me a few days ago as well and >> thanks a lot for the suggestions. I think this may be the most fun I’ve >> ever had with a new rig. It’s just an amazing radio. >> >> ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: Why no love for the 1khz CW filter?
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In reply to this post by w1awb
On Tue,1/31/2017 6:07 PM, [hidden email] wrote:
> I was thinking seriously of the 1 khz CW filter because I do a lot of rag chewing on 80 meter CW and I would think that filter would cut down the noise a bit As others have noted, the K3 is not like older radios -- it gets its IF selectivity from DSP. You can set it anywhere you want. The plug-in filters are roofing filters -- they protect the DSP from getting blown away by big signals close to your frequency. You need them in contests and in DX pileups, but that's all. I use narrow CW filters like K2AV described for contesting. For everything else, the IF filtering provided by DSP is all you need. 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: Why no love for the 1khz CW filter?
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This post was updated on .
In reply to this post by w1awb
Hi Andy,
several replies giving you an ideas over here. Refer to Jim, K9YC...it is short and clear. I am recommending you to simply stay calm. Turn your radio ON, sit and play... Use it daily in different situations for few months then you will be more familiar with your radio and all functions behavior and you will have better idea what you really need. Good luck and enjoy your K3! 73 - Petr, OK1RP (K3/100 #778 since 2008)
73 - Petr, OK1RP
"Apple & Elecraft freak" B:http://ok1rp.blogspot.com MeWe: https://bit.ly/2HGPoDx MeWe: https://bit.ly/2FmwvDt |
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I have a 1k filter. Does it make much difference. I have no clue
really. Would I be better served with an FM filter? maybe . My main receiver has 2.8. 1.8. 1.0 400 and 250 or 200 filters. I do ssb contest and travel to DX locations from time to time. The SSB filters are essential. For CW I honestly think that the 400 is fine for most. I dislike the sound when I really crank the skirts down on CW but sometimes you must so it is nice to have it. If you plan to do diversity receivers you need the same filters in each one and they need to be "matched" as close as possible to get the best results. 2.7 and 400 and and FM filter if you want fm and or AM would be fine for many. W0MU On 2/1/2017 4:26 AM, Petr, OK1RP/M0SIS wrote: > Hi Andy, > > several replies giving you an ideas over here. > Refer to Jim, K9YC...it is short and clear. > > I am recommending you to simply stay calm. > Turn your radio ON, sit and play... > Use it daily in different situation for few months > then you will be more familiar with radio and > all functions behavior and you will have better idea > what you really need. > > Good luck and enjoy your K3! > > 73 - Petr, OK1RP > (K3/100 #778 since 2008) > > > > > ----- > http://ok1rp.blogspot.com > -- > View this message in context: http://elecraft.365791.n2.nabble.com/Why-no-love-for-the-1khz-CW-filter-tp7626342p7626353.html > Sent from the Elecraft mailing list archive at Nabble.com. > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: Why no love for the 1khz CW filter?
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In reply to this post by w1awb
That raises an interesting question.
Looking at Rob's numbers (assuming I've read the chart footnotes correctly) he's done the close in numbers for the KX3 with and without the roofing filter. But the close in numbers for K3S numbers were only done with the cw roofing filters. Is there with/without roofing filter data available for the K3S I missed? I realize the proof is in the performance, but still, inquiring minds and all that..... Cheers Scott ka9p In a message dated 2/1/2017 9:51:57 A.M. Central Standard Time, [hidden email] writes: I have a 1k filter. Does it make much difference. I have no clue really. Would I be better served with an FM filter? maybe . My main receiver has 2.8. 1.8. 1.0 400 and 250 or 200 filters. I do ssb contest and travel to DX locations from time to time. The SSB filters are essential. For CW I honestly think that the 400 is fine for most. I dislike the sound when I really crank the skirts down on CW but sometimes you must so it is nice to have it. If you plan to do diversity receivers you need the same filters in each one and they need to be "matched" as close as possible to get the best results. 2.7 and 400 and and FM filter if you want fm and or AM would be fine for many. W0MU On 2/1/2017 4:26 AM, Petr, OK1RP/M0SIS wrote: > Hi Andy, > > several replies giving you an ideas over here. > Refer to Jim, K9YC...it is short and clear. > > I am recommending you to simply stay calm. > Turn your radio ON, sit and play... > Use it daily in different situation for few months > then you will be more familiar with radio and > all functions behavior and you will have better idea > what you really need. > > Good luck and enjoy your K3! > > 73 - Petr, OK1RP > (K3/100 #778 since 2008) > > > > > ----- > http://ok1rp.blogspot.com > -- > View this message in context: > Sent from the Elecraft mailing list archive at Nabble.com. > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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