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 1 
 on: Today at 09:46:14 PM 
Started by HS0ZIB - Last post by SHORTWIRE
W1AW has a reflector on Echolink that serves the audio from the transmissions.

 2 
 on: Today at 09:33:54 PM 
Started by AK4YW - Last post by AA6YQ

Dave can create a list of things that DXLab can do and HRD cannot and that means nothing until we see a list of things that HRD can do and DXLabs cannot.  

KB1NXE posted a "list of things that HRD can do and DXLabs cannot" in #322; four of his six claims were demonstrably incorrect. The "list of things that DXLab can do and HRD cannot" posted in #326 was in direct response to KB1NXE's request.

As for propagation prediction it's almost always going back to the same thing, Voacap etc. You can do it yourself in 20 seconds Roll Eyes
http://www.voacap.com/coverage.html


The coverage map produced by that site is not very useful. Compare it to this:



If I depended on Voacap I would have lost out on half of my rare ATNO's.  Other than just plain old grey line work the rest of it might as well be reading tea leaves, at least that has been the case for Cycle 24.

Using that coverage map, I don't doubt it. As illustrated above, the VOACAP engine can produce better information. Furthermore, the knowledgeable DXer's exploitation of propagation is not limited to prediction. NCDXF beacons reveal actual propagation to specific locations. DX Spot analysis also reveals band openings, e.g.



or



DXing without a good grasp of propagation is like fighting with one arm tied behind your back. Do yourself a favor and read Bob W9KNI's The Complete DXer.

 3 
 on: Today at 09:19:23 PM 
Started by K0IZ - Last post by N8YQX
Not to go off topic, but has anyone received their CQ award certificate this year? I applied for and was approved for 4 different certificates earlier this year (Winter 2014), and I have yet to see those certificates. I e-mailed several times, but those have gone unanswered.

If they can't even print and mail the certificates, they should at least have the courtesy of not offering these awards.

Got most of my award certificates in the mail on Friday. I guess that they're really backlogged, or I complained enough to merit some attention.

 4 
 on: Today at 09:16:03 PM 
Started by AK4YW - Last post by AA6YQ

You probably missed out a few dozen other things in HRD like a fully customizable interface.

Full Google Earth interfacing (i use that all the time since the grey line with GE is the best made)

DXLab can display both logged QSOs and active DX QSOs on Google earth.

Being able to see from the Cluster if the station is Lotw or eQsl member

DXLab has long provided that capability, plus the ability to limit the definition of "LoTW participation" to stations that have updated QSOs to LoTW within the last X months -- where X is specified by the user.

plus all his entity stats in your logbook.

DXLab maintains realtime award statistics for DXCC, IOTA, Marathon, VUCC, WAS, WAZ, and WPX, which is how it's able to identify active DX stations needed for those awards.


 5 
 on: Today at 08:56:45 PM 
Started by W6EM - Last post by W6EM
JX, you might just be old enough to have brushed your teeth with paste from lead tubes as a kid, so you're doomed as well..... Time for chelation.  

No, lead/tin tube phased out during WW2. They became plastic and aluminum then. They turned all plastic about 20 years ago. Unless you are older than 75 or so, you never used a lead/tin one unless it was real old.
I may not be up to date on Alzheimers causal data, but as far as toothpaste tubes, here's a cite from Dental Trivia: " - Lead in toothpaste: Toothpaste was first placed in collapsible tubes in the 1850's, and they were made of lead.  This practice, though known to be potentially poisonous, continued though the 1950's. During WWII, containers were placed on the streets for collection of toothpaste tubes so the lead could be removed for making bullets."  Q.E.D.  I'll continue to use tin/lead alloy solder as its a superior alloy.  But, I do wash my hands and try not to inhale flux vapors.  Speaking of vapors, running gasoline engine powered generators in garages isn't at all healthy.  CO damage to cells isn't reversable.  Bad enough what age does to brain cells.  No sense in accelerating the process by inhaling CO.  Ahhh, nothing like a solar panel and hand cranked generators to maintain one's health.

 6 
 on: Today at 08:51:31 PM 
Started by KB3MDT - Last post by N8CMQ
It isn't me that you are donating to, but the next guy who needs an unobtainium part.
Without donated carcases, I couldn't be repairing 60+ year old gear.

But there are unscrupulous people that take advantage of their position, so I know
what you are saying. I have been a victim of that on occasion...

And sometimes, your unit, and three or four others can be combined to make one
nice working radio. Which may lead you to think your radio wasn't that bad off, and
you feel cheated for seeing it back in action. Those radios are the ones I am taking
a risk in repairing, as I may not recoup the time I have invested in getting it working
again. So I don't often do that, unless I am fairly sure I can recoup my time.

 7 
 on: Today at 08:48:12 PM 
Started by KB9BVN - Last post by KE6WNH
Remember back in the late 1970s when CB was a big fad, and the FCC was having a lot of trouble with illegal "10-1/2 meter" ops and their modded rigs? I always wondered why the FCC didn't just take the common sense approach by re-allocating the land mobile service, and make the band part of CB, 10m, or some division of the two?

Guess they just needed to have some behinds they could spank...  Embarrassed

 8 
 on: Today at 08:40:05 PM 
Started by VK2NZA - Last post by KE6WNH
KJ6ZOL nailed it.

SW transmitters can still be an economical option for poor countries which can't afford a new state-of-the-art telecom infrastructure (particularly if much of the population is rural).

 9 
 on: Today at 08:36:50 PM 
Started by HS0ZIB - Last post by HS0ZIB
In my quest to maximise the efficiency of my low-band (160/80/40) antenna system (DX Engineering Thunderbird 80/40 plus horizontal wire for top band, radial plate and 64 ground radials of varying length 8m - 30m, also 4 ground rods - 2 meters long for lightening protection), I have been reading articles about ground losses, radiation resistance etc.

With my trusty MFJ analyser, tuned on each band so that the reactive component = zero, I get a corresponding measured R value of 36 ohms.  That sounds good to me, (according to the antenna theory that I've read).

The measured frequency where X = zero is not yet midband - I will need to adjust the antenna length to bring the resonant frequency to the desired frequency. 

With a measurement of R=36 ohms and X= zero, can I assume that my antenna radiation efficiency is maximised?  Or could that R+X measurement be giving me a 'false' confidence?

ie - Are there any other measurements that I can make to confirm that my antenna system is optimised?

 10 
 on: Today at 08:27:40 PM 
Started by W2RWJ - Last post by W2RWJ
Quick question on using Burndy splices and a hydraulic crimper on grounding cables.

Planning on using multiple (three) 1/0 cables from the arrestor to the ground.   The plan is to use Burndy YAZ252TC14E1 lugs with  two 1/4" bolts on the arrestor end, with  the rod end being cad welded.

If I need to splice a cable, I am contemplating using Burndy YC-25 splices and adhesive heat shrink to keep the splice waterproofed.   Any reason (code or opinion) on why you should not splice ground wires ?

73,
Martin Flynn
W2RWJ

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