K2: DSP for CW ?
Locked
 
|
On behalf of a 'friend' - if you are only using the K2 for portable CW is
the DSP really beneficial? He is not thinking about the 100 watt option, just the basic radio for portable use. He has the T1 ATU, are any other options essential? Simon 'Just say no!' Brown --- www.hb9drv.ch www.laax.ch _______________________________________________ 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 |
|
|
> On behalf of a 'friend' - if you are only using the K2 for portable CW
> is the DSP really beneficial? I'll let others chime in, but one feature the DSP provides is particularly useful when the bands are not terribly busy. You can ten widen the IF pasband, activate the denoiser, and listen to the silence. When a CW signal enters the passband (perhaps in response to your CQ), the denoiser will pass it through while still keeping band noise suppressed. Thus, you can monitor without fatigue. 73, Lyle KK7P (who views the K2 as a valuable accessory for the DSP :-) _______________________________________________ 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 |
Re: K2: DSP for CW ?
Administrator
|
In reply to this post by Simon (HB9DRV)
The NB is really inexpensive and can be valuable even in the field, as
noisy airplanes sometimes fly overhead and the NB takes care of them. Also, the SSB board is useful for data modes which can make for fun portable operation. There is some nice PSK software out there... More seriously, the HFPack folks are working with others to develop self-spotting software, so you can post your QRV info: think of a cross between APRS and DX spots. The goal is to this eventually without a computer, either using ALE or some other data mode, so an SSB board will have utility beyond voice and digimode chat. Leigh / WA5ZNU On Mon, 21 Nov 2005 9:40 am, Simon Brown (HB9DRV) wrote: > On behalf of a 'friend' - if you are only using the K2 for portable CW > ...are any other options essential? _______________________________________________ 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 |
|
|
In reply to this post by KK7P
K2 Question [cause I don't know]
Past experience with 'other' DSP options and CW if I have a CW signal buried [way] down in the noise level and DSP is activated the CW signal will sometimes be cut back or disappear along with the noise. So just out of curiousity how does the K series work with respect to you can here the signal faintly amidst the noise levels? --- Chuck AA8VS "Do not fear the enemy, for your enemy can only take your life. It is far better that you fear the media, for they will steal your HONOR. That awful power, the public opinion of a nation, is created in America by a horde of ignorant, self-complacent simpletons who failed at ditching and shoemaking and fetched up in journalism on their way to the poorhouse." --Mark Twain. _______________________________________________ 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 |
|
|
Hi Chuck,
I was a bit skeptical also about purchasing the K2DSP, It seemed that when using the MFJ DSP with my TS850 (pre-K2), I was never able to hear more with the MJF DSP than without it. I ended up selving the MFJ DSP. However, I never really liked the 270 Hz crystal filter on the TS850 as I always had to tune off of zero beat to hear better. Anyway I finally bought the K2DSP and it is excellent. You can crank in some audio amplification at the narrower band widths and it really makes the listening easier as the signals will pop out of the noise. In cases where there is no agc pumping the K2DSP is probably better than the IF filter. But to crank in both filters is very nice. Two weeks ago in the foxhunt I had the IF at 200 Hz and the DSP at 100 Hz and I swear it kept me from going insane. In fact I got both foxes at that setting. ;8) I don't use the denoiser at narrow CW bandwidths, but I am still experimenting with it. Its funny, a friend who is now into QRP has an ICOM 703. He says he can't operate cw because he doesn't have a crystal filter. I asked why he wasn't using the dsp. He said he was but it wasn't very effective. I checked out his radio and the manual and it seems that the 703 dsp only does noise reduction. It does not do narrow bandpass at all. He was using the noise reduction to make the cw more readable. It wasn't working out too well. Makes me appreciate the K2-K2DSP. Regards, Steve, W2MY/5 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.362 / Virus Database: 267.13.4/176 - Release Date: 11/20/2005 _______________________________________________ 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 |
|
|
> ... I don't use the
> denoiser at narrow CW bandwidths, but I am still experimenting with it. The denoiser is not effective at really narrow bandwidths. It is more effective with wider bandwidths, in which case it can suppress noise and let the CW signals pop out of a quieter background. With a very narrow filter already in place, noise looks more and more like a signal because many of its random characteristics have already been suppressed. Think of the denoiser as a filter, looking for "signatures" that look like signals. When it finds one, it builds a filter around that frequency and the signal then appears. If you have already selected a narrow filter, the "denoising" has already been done. 73, Lyle KK7P _______________________________________________ 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 |
|
|
In reply to this post by Simon (HB9DRV)
Hello Simon
I think the KDSP2 is beneficial under all conditions. It provides three features, any one of which can be important at a given moment. The most obvious one is audio filtering, supplementing the internal crystal filter. The next obvious feature is Noise Reduction, not necessarily a problem in the field, but it could be. The final feature, not always recognized, is a small amount of additional audio gain when DSP is engaged. It is set during the setup process, and can compensate for audio level lost in narrower bandwidths. I have my KDSP2 engaged when I'm out on our annual ARRL Field Day every year. Good luck and 73 Bob N6WG The Little Station with Attitude -----Original Message----- From: [hidden email] [mailto:[hidden email]]On Behalf Of Simon Brown (HB9DRV) Sent: Monday, November 21, 2005 9:39 AM To: Elecraft Subject: [Elecraft] K2: DSP for CW ? On behalf of a 'friend' - if you are only using the K2 for portable CW is the DSP really beneficial? He is not thinking about the 100 watt option, just the basic radio for portable use. He has the T1 ATU, are any other options essential? Simon 'Just say no!' Brown --- www.hb9drv.ch www.laax.ch _______________________________________________ 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 _______________________________________________ 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 |
|
|
In reply to this post by crmabbott
Hi Chuck
I run my KDSP2 all the time, and vary the NR setting according to the noise I hear. Sometimes I get improved results by adding the Attenuator or the Preamp. It all depends on the type of noise and its amplitude relative to the desired signal. You really do have to experiment a bit to find the best settings at any given time. The tightest IF selectivity and DSP selectivity often make a big difference too. Try everything and see what works best in your situation. Good luck and 73 Bob N6WG The Little Station with Attitude -----Original Message----- From: [hidden email] [mailto:[hidden email]]On Behalf Of Chuck Mabbott Sent: Monday, November 21, 2005 3:41 PM To: [hidden email] Subject: [Elecraft] K2: DSP for CW ? - Curious K2 Question [cause I don't know] Past experience with 'other' DSP options and CW if I have a CW signal buried [way] down in the noise level and DSP is activated the CW signal will sometimes be cut back or disappear along with the noise. So just out of curiousity how does the K series work with respect to you can here the signal faintly amidst the noise levels? --- Chuck AA8VS "Do not fear the enemy, for your enemy can only take your life. It is far better that you fear the media, for they will steal your HONOR. That awful power, the public opinion of a nation, is created in America by a horde of ignorant, self-complacent simpletons who failed at ditching and shoemaking and fetched up in journalism on their way to the poorhouse." --Mark Twain. _______________________________________________ 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 _______________________________________________ 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 |
|
|
In reply to this post by n6wg
Thanks to you and all who have replied. Due to Elecraft's modular design I
could always buy this later - but for $219 I would probably buy at the same time. [1] Does the DSP2 add significant extra current drain in RX? This is an important criteria as I'll be using batteries / solar cells and will have up to 6 AH of battery with me (2 x 3AH). [2] Would the T1 be OK with the basic K2 (I assume so)? Hope to have K1 finished late next week so K2 would be a Christmas / New Year project. I will look for extra / larger batteries at Friedrichshafen 2006 but my 2 x Ni-MH 3 AH are very good and light. I would like to be able to use my IC-703 portable but it requires up to 600 mA on receive. Simon Brown --- www.hb9drv.ch www.laax.ch ----- Original Message ----- From: "Robert Tellefsen" <[hidden email]> > Hello Simon > I think the KDSP2 is beneficial under all conditions. > It provides three features, any one of which can be important > at a given moment. > The most obvious one is audio filtering, supplementing the > internal crystal filter. > The next obvious feature is Noise Reduction, not necessarily > a problem in the field, but it could be. > The final feature, not always recognized, is a small amount > of additional audio gain when DSP is engaged. It is set > during the setup process, and can compensate for audio level > lost in narrower bandwidths. > I have my KDSP2 engaged when I'm out on our annual ARRL Field > Day every year. _______________________________________________ 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 |
|
|
> [1] Does the DSP2 add significant extra current drain in RX? This is an
> important criteria as I'll be using batteries / solar cells and will > have up to 6 AH of battery with me (2 x 3AH). The KDSP2 has a "bypass" mode where the DSP itself goes to sleep and the CODEC is in analog loopback mode. The added current drain in this configuration is about 10 mA. When it is operational, the KDSP2 adds about 60 mA to the base K2, or 50 mA more than bypass mode. 73, Lyle KK7P _______________________________________________ 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 |
|
|
Thanks, sadly this looks like a DSP2 will be part of the order. Please
inform my bank manager :-) Simon Brown --- www.hb9drv.ch www.laax.ch ----- Original Message ----- From: "Lyle Johnson" <[hidden email]> >> [1] Does the DSP2 add significant extra current drain in RX? This is an >> important criteria as I'll be using batteries / solar cells and will have >> up to 6 AH of battery with me (2 x 3AH). > > The KDSP2 has a "bypass" mode where the DSP itself goes to sleep and the > CODEC is in analog loopback mode. The added current drain in this > configuration is about 10 mA. > > When it is operational, the KDSP2 adds about 60 mA to the base K2, or 50 > mA more than bypass mode. > > 73, > > Lyle KK7P > _______________________________________________ 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 |
«
Return to Elecraft
|
1 view|%1 views
| Free forum by Nabble | Edit this page |