Re: [wsjtgroup] Minimum requirements for 6 meter WSJT EME?
- Hi Zack,
Sorry,. I hadn't realized from your first email that your intent was to try EME.
Your 4 element beam on the rooftop should certainly work well for you on meteor
scatter and during Es/F2 openings with strong signals.
On 1/25/2012 6:22 PM, vtnn43e@... wrote:
> I forgot to tell you what my station consists of;
> Flex-5000 HF rig
> Elecraft KPA-500 amp 500 watt amp
500w certainly can put you in the game to work the larger EME stations, provided you
have a good yagi and very good ground gain.
> A DEMI L50LNA GaAs pHEMT preamp 17dBG, <0.5DBNF
> Installing a Directive Systems DS50-4 4el yagi when it warms up outside. It has
> 8.17 dBd gain. Going to sell the Arrow 3el that I have but not put up yet.
4 elements and 500w is EXTREMELY marginal for 6m EME. I have worked a few stations
that small, who had excellent ground gain. MUCH more typical of successful stations
with that kind of power are those using much larger antennas such as the M2 6M9KHW.
> Can you suggest what *flexible* coax to use? My run is about 75 feet. Using Davis
> Buryflex right now for all of my antennas. They claim 1.1db loss at 50MHz over 100
LMR600 Ultra Flex has about 0.6 dB per 100 feet. I use 50' of that when I am on 6m
EME DXpeditions. However, if your loss is less than 1 dB, you should be OK, and not
need to put the preamp at the antenna. Just remember that EVERY SINGLE dB counts on
6m EME, as signals are right at the threshold of being detected.
With a single yagi on the horizon only, it is essential to use the extra ground gain
that is provided by having CLEAR, UNCLUTTERED, SMOOTH terrain in front of the
antenna, and having no other objects below the antenna (rooftop, HF beam, etc.) to
shield it from ground reflections.
> Once I get the antenna up I will definitely try WSJT scheduling a QSO at
> http://www.chris.org/cgi-bin/jt65emeA and hope for the best.
That page is mainly used for JT65B contacts on 2m EME. All 6m EME is coordinated on
the ON4KST EME chat page:
Most 6m EME activity only occurs during the optimum 4 or 5 days of the month when the
Degradation is below 3 dB. If you DO have good ground gain and cannot find an
interesting station to run a sked with, I am willing to try a contact with you during
your moonset on an optimum day of the month.
GL and VY 73, Lance
> *From: *"Lance Collister, W7GJ" <w7gj@...>
> *To: *vtnn43e@..., "WSJT Group" <email@example.com>
> *Sent: *Wednesday, December 14, 2011 9:11:26 PM
> *Subject: *Re: [wsjtgroup] Minimum requirements for 6 meter WSJT EME?
> Hi Zack,
> Glad you found the information helpful! 6m is probably the band where JT65A has made
> the greatest impact. Before WSJT, 6m EME was limited to very large QRO stations
> using CW with low rates of success. Now there are many single yagi stations - and
> even some barefoot stations! - who have worked EME on 6m. And the way this cycle is
> going, it may be the only way for those of us who live outside the "TEP ZONE" to work
> any worldwide DX on 6m!
> A good way to test out your current station and antenna installation (and see what
> ground gain you have) is to run the EME ECHO MODE in WSJT9. The height of ground
> gain lobes depends on your terrain and the height of your antenna...but a good 7
> element beam 20' above flat ground has lobes around 7 and 15 degrees. Often, I find
> the second lobe (the higher one) is as good or better, because at most QTH's, the
> ground in the immediate vicinity of the antenna is clearer of obstructions, and the
> more distant terrain is usually cluttered with houses, mountains, cars, etc.
> However, don't make the mistake of testing for echoes on a bad day of the month for
> EME! For a much happier outcome, just try it on those days when the "Degradation"
> index is smaller than 3 dB ;-) The approximate Degradation is displayed on the WSJT
> page when you run a JT65 mode...and it is VERY significant on 6m. You can also
> predict upcoming Degradation using my GJTRACKER program. However, to make it simple,
> the best days of the month for 6m EME for the next year are:
> DEC 14,2011-DEC 20,2011
> JAN 10,2012-JAN 16,2012
> FEB 6,2012-FEB 12,2012
> MAR 5,2012 - MAR 11,2012
> APR 1,2012 - APR 8,2012
> APR 29,2012 - MAY 5,201
> JUN 10,2012 - JUN 11,2012
> JUN 22,2012 - JUN 28,2012
> JUL 8,2012 - JUL 9,2012
> JUL 20,2012 - JUL 24,2012
> AUG 4,2012 - AUG 6,2012
> AUG 16,2012 - AUG 22,2012
> SEP 1,2012 - SEP 2,2012
> SEP 12,2012 - SEP 18,2012
> SEP 28,2012 - SEP 29,2012
> OCT 9,2012 - OCT 16,2012
> OCT 25,2012 - OCT 26,2012
> NOV 6,2012 - NOV 12,2012
> NOV 21,2012 - NOV 22,2012
> DEC 3,2012 - DEC 9,2012
> DEC 18,2012 - DEC 20,2012
> DEC 31,2012 - JAN 4,2013
> GL and VY 73, Lance
> On 12/14/2011 8:35 PM, vtnn43e@... wrote:
> > Thanks for the reply Lance. You have lots of good information here! That antenna
> > chart is great. I may get a bigger antenna and just try hitting the Moon when it is
> > on the horizon.
> > You should post the articles in the WSJT group.
> > Zack
> > N8FNR
> > -------------------------------------------------------------------------------------
> > *From: *"Lance Collister, W7GJ" <w7gj@...>
> > *To: *"vtnn43e48073" <vtnn43e@...>
> > *Cc: *firstname.lastname@example.org
> > *Sent: *Wednesday, December 14, 2011 9:29:16 AM
> > *Subject: *Re: [wsjtgroup] Minimum requirements for 6 meter WSJT EME?
> > Hi Zack,
> > It all depends on the terrain around you. If it is flat without any obstructions to
> > block ground gain refections, if MIGHT be possible to complete a JT65A contact during
> > your moonset or moonrise with the larger stations with the station you describe.
> > Under optimum cndx during the month, I have completed with a 100w station using a 3
> > element beam, but that is VERY unusual.
> > Most of the stations I have worked work on 6m EME have:
> > 1. Clear terrain with good ground gain
> > 2. At least a good 5 element beam (more is better). A comparison of popular 6m
> > antennas is here:
> > http://www.bigskyspaces.com/w7gj/VE7BQH%20Charts.xls
> > 3. Short very low loss coax feedline (under 1 dB loss)
> > 4. No HF beam below the 6m antenna to shield it from ground gain reflections
> > 5. JT65A mode
> > 6. At least 500w output.
> > I have worked hundreds of stations on 6m EME, and 120 DXCC so far on 6m EME. More
> > introductory information on 6m EME is here:
> > http://www.bigskyspaces.com/w7gj/6mEMEtoday.pdf
> > http://www.bigskyspaces.com/w7gj/JT65.pdf
> > GL and VY 73, Lance
> > On 12/14/2011 2:08 PM, vtnn43e48073 wrote:
> > > What are the minimum requirements for 6 meter EME with WSJT? I have a 500 watt 6
> > > meter amp and am putting up an Arrow yagi that has about 8.3dbd gain.
> > >
> > > Zack N8FNR
> Lance Collister, W7GJ
> (ex WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX, 3D2LR, 5W0GJ)
> P.O. Box 73
> Frenchtown, MT 59834-0073
> TEL: (406) 626-5728
> QTH: DN27ub
> URL: http://www.bigskyspaces.com/w7gj
> Windows Messenger: W7GJ@...
> Skype: lanceW7GJ
> 2m DXCC #11/6m DXCC #815
> Interested in 6m EME? Ask me about subscribing to the Magic Band EME
> email group, or just fill in the request box at the bottom of my web
> page (above)!
Lance Collister, W7GJ
(ex WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX, 3D2LR, 5W0GJ)
P.O. Box 73
Frenchtown, MT 59834-0073
TEL: (406) 626-5728
Windows Messenger: W7GJ@...
2m DXCC #11/6m DXCC #815
Interested in 6m EME? Ask me about subscribing to the Magic Band EME
email group, or just fill in the request box at the bottom of my web