disconnecting antennas
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Hi
In the past I have always used a coaxial switch to disconnect my radio from the different antennas I have. A few weeks ago I noticed a message posted by Don W3fpr that the coaxial switch wasn't good enough to protect radio equipment, so I started disconnecting my antennas when not in use. That paid off big time. Last week lightening struck my tower and the power surge from it destroyed three computers, a packet tnc, and a TV set. But due to Don's advice my K2 was disconnected and not damaged. I've had a tower up for more than 30 years and this is the first time I have had a lightening strike on it. I was in my shack which is on the second floor of my home and the tower just outside the shack, so the shack is a third of the way up my tower. It sounded like a bomb had gone off just above the house. When I installed the tower I extended the base of the tower a foot below the concrete for a ground. I believe this took the lightening strike to ground, because there was no damage to the house. So disconnect those antennas when not in use. 73 Scott N5SM _________________________________________________________________ http://liveearth.msn.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 |
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Good advice -- but half-way.
Disconnect all equipment from your power mains. Power surges are minor compared to what lightning can do when it gets into the electricals. 73, Kent K9ZTV Scott McDowell wrote: > Hi > In the past I have always used a coaxial switch to disconnect my radio > from the > different antennas I have. > A few weeks ago I noticed a message posted by Don W3fpr that the coaxial > switch wasn't good enough to protect radio equipment, so I started > disconnecting my antennas when not in use. > That paid off big time. Last week lightening struck my tower and the > power > surge from it destroyed three computers, a packet tnc, and a TV set. > But due to Don's advice my K2 was disconnected and not damaged. > I've had a tower up for more than 30 years and this is the first time > I have > had a lightening strike on it. I was in my shack which is on the > second floor > of my home and the tower just outside the shack, so the shack is a > third of > the way up my tower. It sounded like a bomb had gone off just above > the house. > When I installed the tower I extended the base of the tower a foot below > the concrete for a ground. I believe this took the lightening strike to > ground, because there was no damage to the house. > So disconnect those antennas when not in use. > 73 > Scott N5SM > _______________________________________________ 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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No one, not even the vaulted PolyPhaser org has refuted my lightning
rallying cry.... "No path, No strike." Disconnecting is simple, very cheap, and as close to foolproof as human kind can achieve. 73 Charles Harpole [hidden email] _________________________________________________________________ http://imagine-windowslive.com/hotmail/?locale=en-us&ocid=TXT_TAGHM_migration_HM_mini_2G_0507 _______________________________________________ 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 KENT TRIMBLE
Hello:
Retired? Time on ur hands? Experimenting minded? Willing to try new things? Then do this: Set up one fresh, uncooked hen egg in a porcelain cup. Closely on either side of the egg, place a cell mobile telephone. That is, a phone on either of the two sides of this egg set-up. Set one phone to call the other and play some speaking record or music to keep the cel phones transmitting. Let this transmitting run for at least 70 minutes. Then, examine the egg for its heating, if any, and any cooking of the egg, if any. Report results. Debunk or affirm a popular urban legend. Big thanks, 73 Charles Harpole [hidden email] _________________________________________________________________ http://newlivehotmail.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 |
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In reply to this post by Charly
----Original Message-----
From: Charles Harpole <[hidden email]> >No one, not even the vaulted PolyPhaser org has refuted my lightning rallying cry.... "No path, No strike." The problem is simple: Disconnecting doesn't eliminate the path. If a bolt of lightning can jump several hundred feet (or more) of air, why would a few feet of air caused by disconnecting eliminate the path? >Disconnecting is simple, very cheap, and as close to foolproof as human kind can achieve. 73 Disconnecting won't stop a strike. What disconnecting will do is to keep *induced* voltages away from the rig. 73 de Jim, N2EY ________________________________________________________________________ AOL now offers free email to everyone. Find out more about what's free from AOL at AOL.com. =0 _______________________________________________ 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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Jim, your comments make the mistake of assuming the lightning energy wants
to discharge into your radios without a reason... it is just mean and does not care about physical laws. Question, why would the energy jump to your radios sitting alone on a table... no path, no energy flow.... yes? Of course, it can jump from clouds to the ground ... or is it the other way? ... but in that case, IT IS DISCHARGING TO A GROUNDED THING...the earth... or something sadly tied to the earth like your grounded radio. Mine is disconnected FROM EVERYTHING ! No path, no strike..... eh? First my lightning history. 1957 novice station, direct hit on 40m dipole at 30 feet. Boiled copper on the copper clad steel wire, vaporized wire inside tv twin lead, etc. Hook up was totally as per the 1957ARRL HANDBOOK with switch to ground engaged...ha ha.... Result... fried all radios to crispy black, blew all light bulbs in house, and many other things. 1990-2006... Fla set up... 3 considerable strikes, one to 240 ft 160 m dipole which cut the ant wire in 3 places and killed the support trees AT BOTH ENDS. Results to shack, no damage at all because the end of the feedline was 20 feet away from house laying on the earth... open.... with no evidence of current flow thru it... no path, no strike. Other 2 were on tower mounted ants.... long story, end of which is no damage to radios nor home. My set up: Bring all outside wires, except station gnd., to a window patch panel. Double female coax connectors there MOUNTED IN PLEXIGLASS (not metal plate for sure) and Jones plugs for other wires. RF Gnd wire comes in 8 ft away via hole in wall.. goes to 2 8ft gnd rods. All ALL wires at the window are disconnected on the inside, some use push on PL-259. NOTHING is grounded there nor anywhere else on the principal of "no path, no strike." 70 ft tower with 3 beams grounded only by virtue the base is in concrete which is in the earth. Double pole single throw breaker switch on the main incoming AC line to all rigs. Turn that off when not in use. Bad storm coming, unplug master AC cable from breaker to wall outlet. Leaving home for a few days, unplugged the shack ground wire also (that goes thru wall separately). That leaves the radios sitting alone, totally disconnected on ur op bench. Pain in the ass to disconnect. But larger pain is burning home. Make the choice. To reduce unplugging, install remote ant switch at window patch panel and run one coax from that to radio and disconnect that line always. Then, u may fry the switch but not the radios. BTW... keep EVERYTHING away from the inside of the patch panel.... I use min. 4 feet separation, but often had 8 feet separation of wires, tables, kids, dogs, fish tanks, and the wife from the window with the patch panel during storm. Abt 3/week in Fla summer. We just did not walk near the window nor other electrical things as much as possible during boomers. My radio table was 8 ft away and around a concrete block corner from the window panel. Note, when I was 12, I was standing in my KY farm house kitchen in big thunderstorm. House was all wood with metal roof. Strike very close... u can tell by time between flash and boom... closer in time is closer in space.... A metal wash pan sitting alone on a wood table INSIDE THE KITCHEN a few feet from me and 10 feet from window, emits an audible DING. Witnessed by 3 adults and me. Morale: It can get u ANYWHERE !!! GL 73 Charles Harpole [hidden email] Charles Harpole [hidden email] _________________________________________________________________ http://newlivehotmail.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 |
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In reply to this post by Charly
RE my egg and cel telephone experiment.... I forgot to note that all people,
pets, snakes, and other things.... should position themselves in a protected way during and after this experiment. Be safe. 73 Charles Harpole [hidden email] _________________________________________________________________ http://liveearth.msn.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 |
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In reply to this post by Charly
pre-debunked, om
http://gelfmagazine.com/archives/how_to_cook_an_egg_and_create_a_viral_sensation.php On 7/30/07, Charles Harpole <[hidden email]> wrote: > Report results. Debunk or affirm a popular urban legend. _______________________________________________ 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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This might be a double post
Try that with a 1100 watt radio on 2.450GHz inside a RF cage and you've made a microwave. > On 7/30/07, John D'Ausilio < [hidden email]> wrote: > > pre-debunked, om > > > > http://gelfmagazine.com/archives/how_to_cook_an_egg_and_create_a_viral_sensation.php > > > > On 7/30/07, Charles Harpole <[hidden email]> wrote: > > > > > Report results. Debunk or affirm a popular urban legend. > > _______________________________________________ > > 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 > > > > > > -- > W2CVZ, > Michael -- W2CVZ, Michael _______________________________________________ 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 N5SM
Some of the e-mails in this thread exhibit some disregard for the fact that
the shield side of a coax cable feedline is as much a part of the antenna as the center conductor. Simply disconnecting the coax from the rig doesn't necessarily prevent it from drawing hundreds of amps of Megavolt electricity from following that shield to a convenient ground nearby. If for instance you disconnect a diple with RG-8 feedline and simply drop the PL-259 on the lawn. you'll most likely save the rig but not necessarily the lawn. or anything attached to the antenna. Likewise, unplugging a feed line at the back of the rig and dropping the cable on the floor may be too close to the nearest outlet or a lamp cord to prevent an arc-over to the rest of the system. Nothings going to stop lighting that just traversed several thousand feet of atmosphere from "ignoring" 1/2 an inch of carpet, etc. Most of us have been very lucky. My first experience with lightning discharge was listening to my Viking Ranger during a particularly windy night in Golden Colorado as the static buildup jumped from the plate to the cathode of the 6146B tube. I did a hasty removal of the ant feedline and spent the rest of the night wondering where the static was going at that time. Last interesting experience was with what I believe is called dry lightning - no clouds around for miles. Atop Diablo Peak on Santa Cruz Island 24 years ago this week, I was setting up for the annual UHF contest. First job was to assemble antennas. The previous night we (the assembled contest team) observed a rather impressive lightning display from a storm near San Diego, about 200 miles away. That morning about 8 am it was clear and gentle breeze with evidence of T C activity about 80 miles to the North East of us over the San Gabriel Mountains. As we assembled the antennas, mainly sliding 1/8" Alum welding rods through various boom holes, we suddenly noticed a melodic humming like a multitude of tuning forks vibrating around us. The next thing we knew as we hastily dropped what we were doing was all the vegetation, mainly a fine grass that grows about 10 " tall and all very dry this time of year, was standing on end as if reaching for the sky and shaking violently with a very noisy crackling sound..Note, this is not a golf course turf, but a rocky mountain top of the coast of So Cal. We were moving very fast to get off the top and down the cliff side about 1000 ft to the west, where there is a small cave carved in the cliff side. No sooner had we cramped ourselves into this minor cavity than a slight warm breeze came up and an instant later we heard a tremendous crack-bang that we knew was a lightning strike. We didn't know where it struck and we decided to keep our heads down for about 1/2 hour before peeking out and over the edge of the embankment. When we emerged and hiked back up the hill, it was just another pleasant clear day to behold. We never could figure where the strike took place and there were several 50 + ft towers up there. None of our gear was disturbed or anything else we could see including our 220 / 6 M repeater system. Never got over the nervous feeling of lighting from a clear sky. Later that afternoon Thunder storms ravaged many stations while we were in contact with them. Wayne N6NB was Mobile on Mt Pinos and rode out the core of one TC. Pt Mugu NAS 30 Mi to th NE of us had a record rainfall that flooded the base with 3 ft deep runoff. And we remained dry through it all. It's an annual thing to have the Monsoon flow to the SE of here but about once every 10 years it sweeps through with very unpredictable conditions. 73 all - Al WA6VNN ************************************** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tour _______________________________________________ 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 Charly
I see that now Elecraft is offering sale of a Heil K2 Pro Set mic/headphone
unit, saying it is "optimized for K2." I assume that also means K3. Can anyone supply answers: --How does this mic element compare with the Heil 4 DX element? --Why not use my Heil mic/headsets I now have -- two of which are designed for the Yaesu/Kenwood and one of which is designed specifically for ICOM rigs ???????? And which of above would work best with the K3 ???????? I think the K3 mic socket fits Kenwood plug confirguration? (likely more K3 customers would already have Yaesu plugs, but what the hey!!!) Thanks, 73 Charles Harpole [hidden email] _________________________________________________________________ More photos; more messages; more whatever. Windows Live Hotmail - NOW with 5GB storage. http://imagine-windowslive.com/hotmail/?locale=en-us&ocid=TXT_TAGHM_migration_HM_mini_5G_0907 _______________________________________________ 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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Charles Harpole wrote:
> I see that now Elecraft is offering sale of a Heil K2 Pro Set > mic/headphone unit, saying it is "optimized for K2." I assume that > also means K3. Charles brings up a good point. What is it that makes any microphone "optimized" for any radio. Pin outs are obvious of course. - Impedance? - Bandwidth? - Signal Strength? John _______________________________________________ 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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Marketing. :)
-- Julian, G4ILO K2 s/n: 392 K3 s/n: ??? G4ILO's Shack: www.g4ilo.com Ham-Directory: www.ham-directory.com On 9/5/07, John Huggins <[hidden email]> wrote: > > Charles brings up a good point. What is it that makes any microphone > "optimized" for any radio. Pin outs are obvious of course. _______________________________________________ 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
Julian, G4ILO. K2 #392 K3 #222 KX3 #110
* G4ILO's Shack - http://www.g4ilo.com * KComm - http://www.g4ilo.com/kcomm.html * KTune - http://www.g4ilo.com/ktune.html |
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In reply to this post by John Huggins
On Wed, 05 Sep 2007 06:53:40 -0400, John Huggins wrote:
>What is it that makes any microphone >"optimized" for any radio. Pin outs are obvious of course. Many years ago, an international standards organization issued a poorly thought out standard for 2-way radio communications that, if followed, resulted in the bandwidth of transmitted audio being rolled off by 3-6 dB at 3 kHz. Because the higher audio frequencies (1-4 kHz) contribute the most to intelligibility, this resulted in reduced "talk power" and muddy audio if a mic with good (flat) frequency response is used. To compensate for this lousy standard, mic companies began building mics with a strong peak in their response around 3 kHz. This response peak is clearly visible in the response of mics like the Shure 450 -- there's a 10 dB peak at 3 kHz! Plug this mic into a pro sound system and it will sound really nasty, but connected to you ham rig it sounds just about right. Some ham transceivers provide a switchable peak in the audio response so that a pro mic with flat response can be used. The K2 does not. Another element of good communications audio (that is, good "talk power") is to limit the low frequency response so that transmitter power is not wasted on the bassy parts of speech. That's because these low frequencies contribute very little to intelligibility. A good communications circuit will roll off sharply on the low end somewhere between 250 and 400 Hz. It's easy to design this into ham gear, and it's also designed into a few mics. The EV 635A, for nearly 50 years a mainstay of broadcasting, rolls off at about 150 Hz. The K2 runs flat down to about 40 Hz, but can be modified to move the rolloff up to about 200 Hz by changing some capacitors and resistors. A mic also needs enough output voltage to drive the radio. This is not an issue with most ham rigs, but the K2 is a bit low on gain through the audio chain, so it takes a pretty "hot" mic to drive it well. Pro dynamic mics don't have enough output to drive it very well. Finally, the output impedance of the mic needs to be low enough that the input impedance of the radio doesn't load it down. Mics are not designed to be "loaded" (that is, terminated). They are designed to work into an impedance at least 5-10 times their own source impedance. The input impedance of the K2 is on the order of 600 ohms, which is on the low side for a pro mic (typically 150 ohms output impedance). This is easy to change with a few resistors. Summarizing -- for use with the K2, a mic needs relatively high output, should have an output impedance lower than about 100 ohms, should have a pronounced response peak around 3 kHz, and should be rolled off around 250-400 Hz on the low end. 73, Jim Brown K9YC _______________________________________________ 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 John Huggins
John and Charles:
The Heil Prosets with the HC-4 or HC-5 elements don't have quite enough output to drive the K2 without either an external preamp or tweaking of the K2's internal circuitry. The version with the electret element seems to work better with the K2. I believe the Heil K2 Proset is essentially the version with the electret element, but I'm not 100% certain on that matter. All Prosets require an adapter to match your particular mic jack configuration, so that is not a factor. No idea about the K3. 73's, John AA0VE > Charles Harpole wrote: > >> I see that now Elecraft is offering sale of a Heil K2 Pro Set >> mic/headphone unit, saying it is "optimized for K2." I assume that >> also means K3. > > Charles brings up a good point. What is it that makes any microphone > "optimized" for any radio. Pin outs are obvious of course. > > - Impedance? > - Bandwidth? > - Signal Strength? > > John > 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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John and all,
You are correct that 'Heil Proset' by itself does not adequately describe the microphone. As is the case with all Heil mics, one must also be specific about the mic element used. The K2 works best with an electret element because they have higher output levels. The K3 FAQ pages indicate that it has adequate mic gain to handle the lower output Heil HC4 and HC5 elements. The Heil Proset K2 can be used with either the K2 or the K3, and it comes with the Elecraft adapter. 73, Don W3FPR John R. Lonigro wrote: > John and Charles: > The Heil Prosets with the HC-4 or HC-5 elements don't have quite > enough output to drive the K2 without either an external preamp or > tweaking of the K2's internal circuitry. The version with the > electret element seems to work better with the K2. I believe the Heil > K2 Proset is essentially the version with the electret element, but > I'm not 100% certain on that matter. > > All Prosets require an adapter to match your particular mic jack > configuration, so that is not a factor. > > No idea about the K3. > > 73's, > John AA0VE > 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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Thanks for the information all.
So... I guess hooking up a D104 straight to K2 is not going to work out so well. Yes I know this is like putting tail fins on a Ford Taurus, but the kids really dig talking into a mic like that during times we promote ham radio. The D104 with my old Kenwood TS-520 still receives great audio reports and I would like to continue that tradition in some way with new gear. Crazy? John Don Wilhelm wrote: > John and all, > > You are correct that 'Heil Proset' by itself does not adequately > describe the microphone. As is the case with all Heil mics, one must > also be specific about the mic element used. > > The K2 works best with an electret element because they have higher > output levels. The K3 FAQ pages indicate that it has adequate mic > gain to handle the lower output Heil HC4 and HC5 elements. > > The Heil Proset K2 can be used with either the K2 or the K3, and it > comes with the Elecraft adapter. > > 73, > Don W3FPR > > John R. Lonigro wrote: > >> John and Charles: >> The Heil Prosets with the HC-4 or HC-5 elements don't have quite >> enough output to drive the K2 without either an external preamp or >> tweaking of the K2's internal circuitry. The version with the >> electret element seems to work better with the K2. I believe the >> Heil K2 Proset is essentially the version with the electret element, >> but I'm not 100% certain on that matter. >> >> All Prosets require an adapter to match your particular mic jack >> configuration, so that is not a factor. >> >> No idea about the K3. >> >> 73's, >> John AA0VE >> > _______________________________________________ > 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 |
Re: Microphones for K2/3
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In reply to this post by John Lonigro
Never had a problem John getting full rated PEP output from K2/100 #3255
using the HC-4 and HC-5 elements in the Heil ProSet Plus headset without an external preamp, but I don't use the K2/100's VOX. If I used VOX a little more audio gain would be required in the VOX circuit, but additional audio gain between the mic elements and modulator would result in overdrive. Perhaps my K2/100 is a positive tolerance version. 73, Geoff GM4ESD John R. Lonigro <[hidden email]> wrote: > John and Charles: > The Heil Prosets with the HC-4 or HC-5 elements don't have quite enough > output to drive the K2 without either an external preamp or tweaking of > the K2's internal circuitry. The version with the electret element seems > to work better with the K2. I believe the Heil K2 Proset is essentially > the version with the electret element, but I'm not 100% certain on that > matter. > > All Prosets require an adapter to match your particular mic jack > configuration, so that is not a factor. > > No idea about the K3. > > 73's, > John AA0VE _______________________________________________ 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: Microphones for K2/3
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Geoffrey Mackenzie-Kennedy wrote:
> Never had a problem John getting full rated PEP output from K2/100 > #3255 using the HC-4 and HC-5 elements in the Heil ProSet Plus > headset without an external preamp, but I don't use the K2/100's VOX. > If I used VOX a little more audio gain would be required in the VOX > circuit, but additional audio gain between the mic elements and > modulator would result in overdrive. Perhaps my K2/100 is a positive > tolerance version. Interesting point, as I have that same issue with my Heil ProSet (HC5) and my Kenwood TS-2000. The rig has more than adequate modulation with this mic, but not enough gain in the VOX circuit to make VOX usable. Seems to me that the gain through these two audio paths ought to be proportionate in a good design -- i.e., if max modulation gain is just enough for full modulation, then max VOX amp gain should be just enough for effortless VOX operation. Bill W5WVO > > 73, > Geoff > GM4ESD > > > John R. Lonigro <[hidden email]> wrote: > >> John and Charles: >> The Heil Prosets with the HC-4 or HC-5 elements don't have quite >> enough output to drive the K2 without either an external preamp or >> tweaking of the K2's internal circuitry. The version with the >> electret element seems to work better with the K2. I believe the >> Heil K2 Proset is essentially the version with the electret element, >> but I'm not 100% certain on that matter. >> >> All Prosets require an adapter to match your particular mic jack >> configuration, so that is not a factor. >> >> No idea about the K3. >> >> 73's, >> John AA0VE > > > _______________________________________________ > 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 |
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In reply to this post by John Huggins
John,
If your D104 is an older one with the high impedance crystal or ceramic element, yes it will not work so well (if at all). There was an article in QST about a year ago with a circuit design that had a very high impedance input and the low impedance output required by modern day radios, although a transformer with the right ratio should work too. Another alternative is to change the element in the D104. Heil offers a kit to do just that - check www.heilsound.com for info. My D104 with an HC5 element draws comments from time to time. 73, Don W3FPR John Huggins wrote: > Thanks for the information all. > > So... > > I guess hooking up a D104 straight to K2 is not going to work out so > well. Yes I know this is like putting tail fins on a Ford Taurus, but > the kids really dig talking into a mic like that during times we > promote ham radio. > _______________________________________________ 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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