KAF2, KDSP2 or BMF2
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I've been following the neat discussion on filtering with the K2 and find it quite interesting. I have obtain a new type of filter that did not cost me anything. Now the KAF2 worked well for me, but I felt the BMF2 worked better. I have not tried toeh KDSP2 yet (it is rather pricey) so I have stuck with the BMF2 filter along with the K2's crystal filters. The BMF2 works well, travels very well, and can be put in or out of the circuit without too much trouble. BMF2 has a very low power consumption and doesn't not take any power from the K2. Perfect for portable operation too, although I use mine in the shack all the time. It is low cost. the BMF2 is Bio-Mass Filter for the K2. You can have BMF1 for the K1. It is called your brain. Best filter in the world. Fastest and most complex computer yet devised.
Grin Lee - K0WA In our day and age it seems that Common Sense is in short supply. If you don't have any Common Sense - get some and use it. If you can't find any common sense, ask for help from somebody who has some common sense. _______________________________________________ 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 |
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On 4/6/06, Lee Buller <[hidden email]> wrote:
> low cost. the BMF2 is Bio-Mass Filter for the K2. You can have BMF1 for the K1. > It is called your brain. Best filter in the world. Fastest and most complex computer > yet devised. I agree with your statements, the brain is an incredible device, and amazing flexible in adapting to various situations. I am still left wondering though about the "ringing" in my ears after listening in on older hams operate a station during Field Day. Several hams I know have complained of hearing lost and only one can pin it on his day job in a machine shop, rather than too much time listening to a loud radio to attempt to understand a signal underneath the QRN and QRM. Perhaps a not so obvious feature, if it is true, is through the use of either KAF2 or KDSP2 hams listen at a "safer" volume with less risk of further hearing lost, by helping our brain by filtering out at least some of the noise before the brain tries to decode the signal, allowing comfortable listening at a lower volume because your brain is not "working" as hard to separate out the signal from as much noise. I don't know, I am just wondering if anyone agrees or disagrees with that aspect of using additional "hearing aids". _______________________________________________ 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 |
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Michael,
A lot of us "older hams" developed the habit of wearing our "cans" (as the headphones were known) a bit in front of our ears when working CW. I still do it. It protects my ears from sudden loud sounds. It also cuts down on the ringing in my ears. There is almost nothing as hard on hearing as pumping loud sounds directly down the ear canal. A lot of young folk will discover this the hard way when their hearing starts to disappear one of these days. 72, Jim W4BQP since '53 K2 #2268 michael taylor wrote: > >I am still left wondering though about the "ringing" in my ears after >listening in on older hams operate a station during Field Day. Several >hams I know have complained of hearing lost and only one can pin it on >his day job in a machine shop, rather than too much time listening to >a loud radio to attempt to understand a signal underneath the QRN and >QRM. > > > > 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 |
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Look at these commercial operators at work for examples of what Jim is
talking about: http://www.radiomarine.org/historic-5.html Ron AC7AC -----Original Message----- Michael, A lot of us "older hams" developed the habit of wearing our "cans" (as the headphones were known) a bit in front of our ears when working CW. I still do it. It protects my ears from sudden loud sounds. It also cuts down on the ringing in my ears. There is almost nothing as hard on hearing as pumping loud sounds directly down the ear canal. A lot of young folk will discover this the hard way when their hearing starts to disappear one of these days. 72, Jim W4BQP since '53 K2 #2268 michael taylor wrote: > >I am still left wondering though about the "ringing" in my ears after >listening in on older hams operate a station during Field Day. Several >hams I know have complained of hearing lost and only one can pin it on >his day job in a machine shop, rather than too much time listening to a >loud radio to attempt to understand a signal underneath the QRN and >QRM. _______________________________________________ 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 |
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Glad you posted this, it's a FB handy household hint to save hearing!
73 de Alex NS6Y On Apr 6, 2006, at 11:01 PM, Ron D'Eau Claire wrote: > Look at these commercial operators at work for examples of what Jim is > talking about: > > http://www.radiomarine.org/historic-5.html > > Ron AC7AC > > -----Original Message----- > > Michael, > > A lot of us "older hams" developed the habit of wearing our "cans" (as > the headphones were > known) a bit in front of our ears when working CW. _______________________________________________ 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: KAF2, KDSP2 or BMF2
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In reply to this post by michael taylor-3
michael taylor <[hidden email]> wrote:
<snip> Perhaps a not so obvious feature, if it is true, is through the use of either KAF2 or KDSP2 hams listen at a "safer" volume with less risk of further hearing lost, by helping our brain by filtering out at least some of the noise before the brain tries to decode the signal, allowing comfortable listening at a lower volume because your brain is not "working" as hard to separate out the signal from as much noise. I don't know, I am just wondering if anyone agrees or disagrees with that aspect of using additional "hearing aids". ---------------------------------------------------------------------------- Wearing the "cans" in front of one's ears as noted by Jim W4BQP has saved my ears during almost 60 years of operating. As for audio filtering etc, in another receiver I use a form of "stereo" audio circuitry, with low pass filters in each channel to reduce noise, plus some other trickery. The result is akin to being at a party with conversations being held in various parts of the room, some from the left others from the right, some from the front and others from behind. This really helps the brain to search out and lock onto a particular person's chatter (the desired signal). Unfortunately I have had better results using two product detectors rather than one with audio phasing, to produce the two audio inputs, so such a system could be difficult to add to the K2. But there is always the K3! 73, Geoff GM4ESD _______________________________________________ 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 |
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In reply to this post by Ron D'Eau Claire-2
I was taught to keep the cans forward while working at a coastal marine
station during my senior year in HS (age 16). I thought then it was so the op who was assigned to train me could more easily box me on the side of my head when I made a mistake (which would be whenever I touched the mill or key) without damaging the headphones. A few years later, most of my hearing left me in a few milliseconds due to a big bang behind me. Now, I put the well-padded cans directly over my ears and crank the AF gain up to roar. The MRHS at Ron's link recently received a coastal marine license (KSM - first one issued in over 20 years or so), and can generally be found on Saturday afternoons (2000Z - 2400Z) running their wheel on 6474 Kcs. The also sometimes activate KPH on 426 Kcs sending press. They usually guard 7050 and 14050 Kcs from the second operating position as K6KPH, and they will QSL KSM/KPH reception reports on authentic radiogram forms if you ask them to. If you want to play "commercial CW op" a typical report might be: K6KPH DE <yourcall> QLB KSM 6474 QSA 5/KPH 426 QSA 4 K The site is in the Point Reyes National Seashore and they get a lot of visitors on weekends for whom they handle traffic on the ham bands. There are still a few HF-equipped ships with proficient ops, and you'll occasionally hear KSM respond to them too. Fred K6DGW Auburn CA CM98lw Ron D'Eau Claire wrote: > Look at these commercial operators at work for examples of what Jim is > talking about: > > http://www.radiomarine.org/historic-5.html > > Ron AC7AC > _______________________________________________ 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: Re: "Cans" and KPH (was something else unrelated)
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Fred wrote:
K6KPH DE <yourcall> QLB KSM 6474 QSA 5/KPH 426 QSA 4 K ---------- Fred, you are sounding like a Ham contester!! For those who don't recognize QSA and QLB, QSA is the commercial radio operators signal report (instead of the RST Hams use). I think it's far preferable since it assumes a decent tone (T), and it's been a long time since a normally-operating Ham rig produced anything but a perfect T-9 tone. The QSA report ranges from QSA 1 to 5 with 1 as the weakest that can be copied at all to 5 being very strong and perfect copy. QSA 0 is usually referred to as simply "nil" - no copy. I know Hams these days commonly send some arbitrary RST that has nothing to do with the actual signal, or they are concerned that they'll offend another station by sending anything less than 599, but real radio operators report truthfully! So if you use QSA, report the actual signal as you hear it! I'll often send a QSA report instead of an RST report on the Ham bands if the other station sounds like a "Sparks" - they are usually easy to spot running their bugs with the smoothness of a radio announcer's baritone voice <G>. If someone wants to use QSA instead of RST, by all means do so. For those who want to complete a QSO with the fewest possible characters, it is shorter! Just don't fall into the Novice trap of sending a QSA greater than 5. Like Readability in RST, QSA runs only from 1 to 5. Unfortunately, being 600 miles north of them, I must often report to KPH that their 426 KHz signal is QSA 1 or Nil unless it's well after dark. Oh, if someone's wondering about "QLB" it means, in this context, "Here's your signal report...". Ron AC7AC _______________________________________________ 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: Re: "Cans" and KPH (was something else unrelated)
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In reply to this post by k6dgw
On Fri, 07 Apr 2006 10:16:10 -0700, Fred Jensen wrote:
>The MRHS at Ron's link recently received a coastal marine license (KSM - >first one issued in over 20 years or so), and can generally be found on >Saturday afternoons (2000Z - 2400Z) running their wheel on 6474 Kcs. >The also sometimes activate KPH on 426 Kcs sending press. KSM is authorized for 426 KHz (and others) for traffic under its own call sign (see below). >They usually guard 7050 and 14050 Kcs from the second operating position >as K6KPH, Just two days ago the organization was issued an additional amateur club station call sign K6KMI -- KMI was the now defunct and cancelled AT&T High Seas Marine OIperator, whose receiving station was the next-door neighbor to KPH/KSM (transmitters were at Dixon, CA). Does that mean that they are trying to restore KMI as well (don't know....). >and they will QSL KSM/KPH reception reports on authentic radiogram forms >if you ask them to. If you want to play "commercial CW op" a typical >report might be: > >K6KPH DE <yourcall> QLB KSM 6474 QSA 5/KPH 426 QSA 4 K I amuse those who know what I am doing by using the following as a beacon ID from my 2-meter packet stations (I have 2 channels up and running 24/7): VVV VVV VVV DE K2ASP QSX THIS FREQ MAILBOX K2ASP DIRECT K2ASP-2 That has served to pique the interest of several young and not so young "packeteers" who were not familiar with marine CW procedure. >The site is in the Point Reyes National Seashore and they get a lot of >visitors on weekends for whom they handle traffic on the ham bands. They will also handle commercial traffic at no cost if it is going to a station authorized to receive marine radiograms. They are on the GGNRA using equipment which belongs to the GGNRA so they can't charge fees. Last summer several of us received the "nickel grand tour" of both the receiving station at Pt. Reyes and the transmitters as Bolinas, mainly becaause we were fly-on-the-wall supporters of the MRHS on technical and legal matters from the start and the operators at both places were long-time friends and "day job" colleagues of ours. I had the "honor" of originating the first unplanned commercial message which was sent to the Jerimiah O'Brien (KXCH), their restored WW-II Liberty ship in San Francisco harbor. In essence it said: "PLEASE PREPARE YOUR LOGS AND RECORDS FOR INSPECTION - /S/ PHILIP M. KANE" (I was the FCC's chief ship radio inspector in SF for almost 30 years). The ship's reply, sent by the ship's operator - the first female coast station operator at KPH - was "OUR LOGS AND RECORDS ARE ALWAYS READY FOR INSPECTION, PHIL". "A good time was had by all." >There are still a few HF-equipped ships with proficient ops, and you'll >occasionally hear KSM respond to them too. The MRHS and its counterparts on all three coasts are working hard to get the MF and HF marine stations onboard "museum" ships restored to original condition. AFAIK this includes several WW-II era Liberty and Victory ships, smaller vessels, and the "crown jewel", the USS Massachusetts, as well as another coast station or two. I urge any of the CW (or phone) ops here to visit these stations if they are in the area. -- 73 de K2ASP - Phil Kane K2/100 s/n 5402 - coming to a HF band near you soon. _______________________________________________ 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 |
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