Re: [Elecraft] K3S DSP filter plots

Hi Charles, You mention "interaction" as if it were some phenomenon to be avoided. In the K3 the roofing filter is in the analog 8 MHz IF and the DSP filter is program code working on the number soup somewhere after the RX analog to digital signal conversion. The only "interaction" possible is

[Elecraft] K3S DSP filter plots

Thanks for the reply Joe. I'm hoping that the constant slope you described is not the way the DSP filters are implemented, because that would mean the 50hz filter has a 5.625:1 shape factor, the the 100hz filter has a 5:1 shape factor, the 200 hz filter has a 3:1 shape factor and the 400hz

[Elecraft] kpa500 35 watts drive

When I had my KPA500 I never ran more than 25 watts to get full output.  Doesn't sound right to me.  de ke4d John Fort Clark Springs, Texas __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help:

Re: [Elecraft] kpa500 35 watts drive

What is wrong with the sound, John? Are you getting distortion? Could you be more specific and then someone should be able to assist you. 73 de David G4DMP David Pratt on his Nexus 7 tablet. On 16 Nov 2015 16:19, John Veach wrote: > > When I had my KPA500 I never ran more than

Re: [Elecraft] K3S DSP filter plots

I suspect you have researched these pages. But in case you haven't, I found these links to be helpful. Also the KE7X book has K3 roofing and dsp information. This is not exactly what you requested, regarding plots, but I think it may answer some

Re: [Elecraft] K3S DSP filter plots

Does anyone have Elecraft published plots of the narrow CW DSP filters, To the best of my knowledge, Elecraft have never published "curves" of the DSP response since the DSP is so dynamic. However, I remember Lyle commenting that the DSP has a constant skirt slope something on the order of

Re: [Elecraft] K3S DSP filter plots

Here is a site that provides free computer based spectrum displays. I use Spectrum View in conjunction with the USB soundcard within the K3S. It can be run in real time and you observe the changes that occur as the various parameters of BW and Shift are utilized. Easy to use and best of all,

Re: [Elecraft] K3S DSP filter plots

Charles, Getting a plot is not difficult to do. Just connect an audio spectrum analyzer such as Spectrogram or SpectrumLab to the audio output of the K3 and feed the antenna input with a broadband noise generator. I use that technique most every day when aligning the IF filters on K2s -

[Elecraft] K3S DSP filter plots

Thanks for the reply Guy. I understand your rationale for aligning IF and DSP filters for additional out-of-passband rejection in crowded contest conditions. My concern stems from using IF shift to move the DSP filter within the roofing filter passband. The Elecraft rep I spoke to last week

Re: [Elecraft] KPA500 troubles

Probably best to change the topic of this, as it has drifted into a different area. Eric /elecraft.com/ On 11/13/2015 9:01 PM, Jim Brown wrote: On Fri,11/13/2015 1:30 PM, Wes (N7WS) wrote: Note, there is no mention of any directivity, or lack thereof, so I would take it that this is a

[Elecraft] K3S DSP filter plots

Charles, Here are some quick and dirty readings from my Field Day K3 which is equipped with a 400 Hz filter, but nothing narrower. Both sets of S meter readings below start with the K3 in CW mode tuned to 3550.000 with the S meter reading S9+40 from a 3550.0 signal supplied by an HP8640B.

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Re: [Elecraft] K3S DSP filter plots

It would be nice to know the DSP filter shape factors of the various narrow CW DSP filters http://marc.info/?l=elecraft=120716404727944=2 Dave Hachadorian, K6LL Yuma, AZ . __ Elecraft mailing list Home:

Re: [Elecraft] K3S DSP filter plots

Charles, I believe most operators use the RIT control rather than IF Shift to tune for off frequency stations. The IF shift is normally used to reduce interference from an "offending station". That along with the Width control can isolate a single station with ease and with the 50 Hz minimum

Re: [Elecraft] K3S DSP filter plots

Are we interested in the shape of the DSP filters inside the roofing filters or are we interested in the performance of the receiver using recovered audio? I have done measurements using a broadband noise for the source and measured spectrum of the recovered audio. Of course as the DSP BW is

Re: [Elecraft] K3S DSP filter plots

The DSP filtering is not stepped, but is continuously variable with the WIDTH control. There are no discrete DSP filters. 73, Don W3FPR On 11/16/2015 7:24 PM, Bob McGraw - K4TAX wrote: Is the reference to the DSP filter system or the roofing filter system? Since the reference is CW x

Re: [Elecraft] K3S DSP filter plots

No doubt Wayne is qualified, however he has deferred on several occasions to Lyle who I believe actually writes the code. And a teeny point from a math major ... inasmuch as arithmetic is a part of math, it is clearly "done mathematically." The "real" math however is in figuring out what

Re: [Elecraft] K3S DSP filter plots

Is the reference to the DSP filter system or the roofing filter system? Since the reference is CW x Filters, as a misnomer, one would presume the reference is actually to the roofing filters. Where as the DSP filter system is stepped from 50 Hz, 100 Hz, 150 Hz and etc. as such. 73

Re: [Elecraft] K3S DSP filter plots

The narrowest filter settings (50 Hz and 100 Hz) are actually steeper than this, and the IIR filters (menu selection) are different, too. I see all sorts of notes in this thread about S Meter readings. Much easier to turn AGC off and use the dB metering function in the radio. Of course, I admit

Re: [Elecraft] K3S DSP filter plots

On 11/16/2015 07:38 PM, Dave Hachadorian wrote: ... The inference I drew from Lyle's response is: DSP 60 dB BW = DSP Setting + 300 Hz. You can see that DSP "shape factor" varies with the DSP setting, so it is easier to remember the DSP+300 formula. It's worth mentioning that a similar thing

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Used KP6 pre-amp for sale, works perfectly but selling as I am getting a K3S. I want $80.00 Paypal and I will pay the shipping. Sold as is but leaves my place working. Ed W0SD __ Elecraft mailing list Home:

[Elecraft] K3S DSP Filter Plots

Hi Bill, Thanks so much for the data for the two filter configurations. This will give me a pretty good idea of the shape factor of the 200hz DSP filter. I just ordered a K3S, and the technician that helped me with some of my questions said that no one has ever asked him about the shape

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Re: [Elecraft] K3S DSP filter plots

Is the reference to the DSP filter system or the roofing filter system? It is all about the DSP system. Lyle performed an experimental test of a 500 Hz DSP filter inside a 2.8 KHz roofing filter, so the DSP filter was the determinant factor. Here is his email again:

Re: [Elecraft] Feature request: OFS Knob as frequency fast up/dn

Peter, I assume you are talking about the KX3. It is already there - look at the VFO CRS description on the manual (see page 40). Note that this is a per mode setting. No firmware change is necessary. The K3 (and K3S) has something similar but uses the RIT knob if CONFIG: VFO OFS is set

Re: [Elecraft] Feature request: OFS Knob as frequency fast up/dn

No, the K3S. Amazing that it was already thought of and part of the radio. Color me impressed! On Mon, Nov 16, 2015 at 8:28 PM, Don Wilhelm wrote: > Peter, > > I assume you are talking about the KX3. > It is already there - look at the VFO CRS description on the manual

Re: [Elecraft] Feature request: OFS Knob as frequency fast up/dn

The Rounding YES/NO doesn't seem to have any effect. What should I be seeing? 2.5Khz is the highest value I can set. On Mon, Nov 16, 2015 at 8:28 PM, Don Wilhelm wrote: > Peter, > > I assume you are talking about the KX3. > It is already there - look at the VFO CRS

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Looking to buy an Elecraft XG3 Signal Gen.. if you have one to sell please email me directly. Thank you much Dan - NB1C __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help:

Re: [Elecraft] K3S DSP filter plots

It's easy to measure this. Here's one way to do it - assuming you already have a functioning AFSK/PSK interface working with a rig/PC. Download and install the WD6CNF Audio Spectrum Analzyer. Set it up to listen to your rig interface AF feed. On the rig, turn of the AGC and the rig's

Re: [Elecraft] K3S DSP filter plots

Oops. Hit the go button too fast. 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie -Original Message- From: Jeff AC0C Sent: Monday, November 16, 2015 8:25 PM To: George Fritkin ; k6...@foothill.net Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] K3S DSP filter plots It's

[Elecraft] Feature request: OFS Knob as frequency fast up/dn

One of the few things I miss from my Kenwood TS-590S is the Multi/CH knob that lets you change the VFO frequency up or down 5 KHz for each encoder transition. I used this all the time to go quickly to a frequency within a band. It was even usually faster than the manual keypad entry. I propose

Re: [Elecraft] Feature request: OFS Knob as frequency fast up/dn

The K3/K3S already does this! Set Config:VFO OFS to ON. Adjust rate with Config:VFO CRS. 73, Ian N8IK -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Peter Pauly Sent: Monday, November 16, 2015 20:14 To: Elecraft Reflector

Re: [Elecraft] K3S DSP filter plots

And I will add a filter is not a filter. No, I am not crazy. There are many types of filters with various trade-offs. In band ripple.loss..phase shift...skirt shapeare just some of the trade offs. DSP software can emulate any or combos George, W6GF Sent from my iPad >

Re: [Elecraft] Feature request: OFS Knob as frequency fast up/dn

Peter, Yes, 2.5kHz is the upper limit, but for SSB I use 0.5 kHz because SSB stations are usually on 1 kHz boundaries although 0.5 boundaries are possible. For CW I use 0.1 kHz. 2.5kHz is typical for FM stations, but too wide for SSB or CW. To me, it is just a quick way of scanning

Re: [Elecraft] KAT500 Re-Tuning

If the band lines are used only, the ATU picks a mid band freq if there is no history since last ATU power up. On first tx after that, it performs a memory recall tune using the counted freq. Power up means DC power applied. A k3 can provide approx freq on RX thru the ACC cable, depending on

Re: [Elecraft] K3S DSP Filter Plots

I believe 5 dB is the correct number. But Lyle's suggestion to use the dBV function is a good one. Vic 4X6GP/K2VCO > On 17 Nov 2015, at 1:04 AM, char...@k5ua.com wrote: > > We are also going to assume that the K3 S-meter is 6 dB per S-unit all the > way from S5 to S9+40dB.

Re: [Elecraft] [Bulk] Re: KX3 Internal soundcard

The KX3 with PX3 is my primary shack transceiver which is dedicated to 2m DXing. (I use an external transverter). As I need to be able to switch between Data (WSJT)and SSB/CW frequently and didn't want to be constantly plugging and unplugging mic and speaker leads here is what I did: For

Re: [Elecraft] K3 Attenuator Turning Itself On

I have a 50 kW BC station a few miles away. I had to make a HP filter because of the IMD. But it was not strong enough to force the attenuator on! 73, Vic, 4X6GP/K2VCO Rehovot, Israel http://www.qsl.net/k2vco/ On 15 Nov 2015 22:22, Don Wilhelm wrote: Sounds like you may have a strong AM

Re: [Elecraft] KAT500 Re-Tuning

Thanks -this is helpful information. If going the hardware route, I am inclined to implement the logic via an RS-232 wedge device vs implementing a BAND0-3 device (basically an antenna switch). 73, Cliff K3LL/6 -Original Message- From: Dick Dievendorff [mailto:d...@elecraft.com] Sent:

Re: [Elecraft] K3S DSP filter plots

Having a constant slope makes a lot of engineering sense. I believe, at least at some bandwidths, the K3 offers both IIR and FIR (infinite and finite impulse response filters). For data modes, FIR filters are better, as they are linear phase filters. The skirt slope of such a filter is