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   Home   Help Search  
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 11 
 on: Yesterday at 10:07:22 PM 
Started by KI7OF - Last post by KD8IIC
  Old Saying; The proof is in the pudding.
I have worked many CW hams using hamsticks in a dipole arrangement.
I have worked QRP CW hams in apartments using a wire dipole taped along the ceilings or tacked to baseboards.
I have worked far fewer hams in apartment situations running the whip type antennas.
If they worked so well, considering their price, then one would conclude you'd hear many more than I have.

 12 
 on: Yesterday at 09:58:51 PM 
Started by KT0DD - Last post by K1HMS
Hello Frank,

As long as the receiver is quieter with the antenna disconnected you are limited by the SNR at the coax connector from the antenna. Your wire arrays are impressive, if you are receiver limited there are a several dBs to be gain with a new radio. KTB (-144 dBm 1 kHz BW, 310K) is the physical noise floor limit. The 590 is only a few dBs short of it. The best radios are basically at it, so there is not much to be gained.

Moving from a tested -139 dBm to -143 dBm MDS at the receiver input if the noise at the coax is S1 (-127 dBm) you will not hear a difference on the air. It matters even less if the system noise is S2 or 3. 

Antenna G/T is typically the limiting factor.

I have a 590SG and 7300, close in signal separation does not get much better than the 590 in the low IF (11 MHz) bands including 40m. You will notice a difference in the WARC bands that up convert to 74 MHz. This can be seen in the Sherwood numbers. But overall I do not think you are going to hear too many stations that you can't copy with the 590SG.

I've used a K3S and 6700/Maestro during field day this year along side 7300s, I've used a IC-7851 in a Calif QSO party. The multiple band integrated SO2R operation, the ease of quickly shifting the IF or moving a notch to kill an adjacent signal using the graphic display, a broadband feed for CW Skimmer, better noise reduction for certain types of QRM, and a dozen other features all add up to a higher QSO rate and a better contest score.

If you want to up your QSO rate go for a contest radio like a Flex. If you want to work the EU when the band is closed to most, or increase the number of VKs long path spend the same or less money on antennas, RF filters, and RFI/EMI mitigation. Stacked mono band 40m beams, receive only antennas, or a curtain also might be interesting.

Flex and the 7851 can be hard to find to demo. Go to a HRO or similar, find difficult (weak, close, QSB/QRN) signals with the 5000 and switch over to the 590.. I've done this, there wasn't the difference I expected.

73

Hamilton K1HMS

 13 
 on: Yesterday at 09:58:28 PM 
Started by AF3Y - Last post by KM4SII
http://www.dk6ao.de/   (Last line)
Well then! Family friendly for sure (sarcasm)  Grin

73 de KM4SII

 14 
 on: Yesterday at 09:47:58 PM 
Started by KU7I - Last post by WZ7U

Herr KU7I,

You'll do just fine with RG-213. Why though is your antenna so far away.

I use 100 feet of RG-213 out the shack window around the house and to the backyard.

And I just had a wonderful 17 meters QSO with a gentleman in Lansing, MI.

My SR8T, 100 watts, delta loop via 100 feet of RG-213. So Kraus, why do you need
or want an amplifier?

Alrighty

Kraus

Probably trying to dodge the HOA  Grin

 15 
 on: Yesterday at 08:34:06 PM 
Started by KM3K - Last post by KM3K
Hello,

Wondering what to expect just prior-to/during/immediately-after this eclipse relative to propagation-effects?
Perhaps there'll be gray-line effects?
Or night-time propagation during the eclipse?

This link has times the eclipse occurs across the USA...
http://www.foxnews.com/science/2017/07/23/this-august-2017-phenomenon-hasnt-occurred-in-almost-century.html

73 Jerry KM3K

 16 
 on: Yesterday at 08:25:09 PM 
Started by AA4PB - Last post by SV1XV
It also depends on the level of activity.

For me (Greece, KM18) SV5, Mt Athos, ZA are all DX on 6 m. Also squares KM16 and KM26.

It took me decades to confirm KM28 on 6 and 2 m and still have no LoTW confirmation for KM17 (a few blocks away) on 70cm.

I also know that in England square IN79 is DX, for obvious reasons.


 17 
 on: Yesterday at 08:18:40 PM 
Started by N6YFM - Last post by SV1XV
ADIF : Does not list FT8, a new version is expected
eQSL.cc : It accepts FT8 mode readily
ClubLog : It accepts FT8 and stores it as "Data" (Digital) as it does not distinguish between modes
LoTW : It does not accept FT8 yet. You may upload it as "DATA" but if someone later uploads QSO as "FT8" they QSOs shall not match.
Logger32 : You must add FT8 by editing ADIFmodes.txt
ADIF Master: You must add FT8 by editing modes.txt

 18 
 on: Yesterday at 08:05:14 PM 
Started by KF5KCA - Last post by N9AOP
The current consumption figures I gave were measured and not taken from some list.  As some of the posters said, it is what you want to do and what compromises you will accept.  If I really want to backpack then I take a 4 band you-kits radio sold by Vibroplex and forgo SSB.  Even with the KX3 I did not like SSB at 5 watts and that rig overheats when using digital at over 5 watts and sometimes at 5 watts without a 3rd party heat sink.  My choices when camping now is usually trailer camping so powering the 891 is no issue.  Hope you like whatever you choose and hope you come back here in 6 months to tell us about it.
Art

 19 
 on: Yesterday at 07:48:42 PM 
Started by LENNYKB2NYA - Last post by AC6LA
What's the easy way to upload pictures?

If you'd like to include your pictures as part of your post instead of as a link, see here.

If you go that route, make sure you tell Postimage to resize your photos.  Nobody wants to wait for a multi-megabyte image to load just to be able to see the eyebrows on a gnat!   Smiley

Dan, AC6LA

 20 
 on: Yesterday at 07:41:07 PM 
Started by KT0DD - Last post by KT0DD
Solid State is getting ridiculously expensive. Ameritron's ALS 600 has just inflated another $300-$500, and the others are out of my reach. It's most likely going to be an AL811H or an AL80B if I can raise the funds. $1500. is my MAX limit.

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