Ok, after help from K4KHV, it seems that my cable is Commscope FXL-1873.
And, I was further incorrect because this IS 1 5/8" even though it is 50mm.
What is really surprising is the Vf, shown on the spec sheet as 0.88
which is higher
than any foam coax I had seen to date.
Now I need to remeasure the coax with an update Vf. At this time, I
cannot roll it out and
actually measure its length.
73
Glen K4KV
ps - the spec sheet loss shows 0.432db/100' at 450Mhz, and less than
0.7db at 1Ghz
-------- Forwarded Message --------
Subject: Re: [Moon-Net] frst rx test on 10 ghz
Date: Wed, 1 Jul 2020 06:35:49 +0100
From: Charles <g3wdg(a)moon-net.eu>
To: Oguzhan Kayhan <oguzhan(a)kayhan.name.tr>
Hi Oguzhan
Your dish is certainly large enough to receive DL0SHF.
The beacon uses vertical polarisation and is located at JO54cg. There
will be a small offset from vertical at your location, but not enough to
prevent receiving it.
Dish pointing may well be an issue. Your dish is large enough also to
receive moon noise, at least 0.5dB if it is working properly. I'm not
sure how well the Octagon works at 10368 however.
Checking sun and then moon noise would be your best option before trying
to receive the beacon I think.
It will be not too easy to see 0.5dB change in the noise level with SDR
Console's displays, but you should be able to see the noise level
increase with the sun (possibly as much as 10dB with your setup).
Many EME operators use Spectravue continuum mode to display small
changes in noise level. This software takes IQ data from an SDR. You
can get this from SDR Console and feed it to Spectravue via a virtual
audio cable. I have tested 48kHz and 96kHz bandwidth from SDR Console
and both seem to work about the same. Larger bandwidths don't work (for me).
Once you have verified that you are getting sun and moon noise, then you
are ready to look for the beacon.
It is easier to see the beacon in a narrow bandwidth spectrum/waterfall
display. You can probably set up SDR Console to do this, or use the
combo display in Spectravue. Your problem in using a narrower band
display is that your unmodified Octagon may be significantly off
frequency. I'm not sure by how much, but you could probably estimate
this using it without beacon locking on QO-100. The frequency offset
will be temperature dependent too. The other issue is that the
unmodified LNB has relatively poor short term frequency stability, so
the beacon's signal will be smeared out somewhat which may make it more
difficult to find.
The frequency instability of the unmodified LNB will make it impossible
to decode the beacon. Locked LNBs certainly can decode the beacon very
well - have a look at KA1GT's article here:
http://bobatkins.com/radio/10Ghz_EME_rx.html
Doppler shift is significant on 10GHz too - the beacon can be up to
about +/-20kHz away from 10368.025 depending on where you are in the
moon pass. I would recommend downloading WSJT-X - this will tell you
the Doppler shift in real time from your location.
Another thing to bear in mind is that the beacon is not QRV on days
where the elevation of the moon, when due south in JO54cg, is less than
20 degrees. At the time you listened it was QRV - I saw a report on HB9Q
EME reflector for yesterday that showed someone reporting it as QRV. In
the next days, the moon is going to more negative declinations and the
beacon will not be QRV. For more info on the beacon see
http://bobatkins.com/radio/DL0SHF_10GHZ_beacon.html
GL
73
Charlie G3WDG
On 30/06/2020 22:23, Oguzhan Kayhan via Moon-net wrote:
> Hello
> I have a 120cm offset dish that I use to listen QO-100 qsos for a while.
> With Octagon LNB (unmodified) and a sdr receiver..
> I can get qo-100 beacons around 59+18/20 db.. No problem on SSB
> transmissions even without beacon lock function of sdr console
> software...no wobbling on downconverting 10 ghz signal of QO-100
> Anyway, tonight I gave a shot to dl0shf beacon if I can see any trace
> etc..
> I have the delta of frequency drift of real frequency from qo-100
> beacon around 200-250 hz (sure with some little extra drift)
> I set my frequency around 10.368.025
> Set my dishes azimuth easly with help of moon light shadows
> And set the elevation with help of a manual inclinometer.
> Tried both horizontal and vertical but.. no sign of any signals on
> whole spectrum..
> Am I missing something? Any tricks welcome..
>
>
> _______________________________________________
> Moon-Net posting and subscription instructions are athttp://www.nlsa.com/nets/moon-net-help.html
>
Hello,
I just received some large, 50mm coaxial cable.
It has no visable markings. I cannot seem to find any information on it.
It is 50mm in diameter (outer jacket) with a polyethylene cover, and
smooth aluminum
outer conductor. I was told it came off a cell tower. My searches on
the internet came up nil.
Can someone point me to a internet source so I might discover the name
or number of this coax?
73
Glen K4KV
Hello All,
The 432 MHz and Above EME Newsletter for June 2020 by K2UYH can be downloaded from:
http://www.nitehawk.com/rasmit/em70cm.html
-- Enjoy
-- Tnx Al.
-- Be safe everybody.
73 Rein W6SZ
I acquired the above sequencer from a SK estate, but there is no manual. Does anyone
have a manual they can share with me? MNI TNX and VY 73, Lance
--
Lance Collister, W7GJ(ex WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX, 3D2LR, 5W0GJ, E6M, TX5K, KH8/W7GJ, V6M, T8GJ, VK9CGJ, VK9XGJ, C21GJ, CP1GJ, S79GJ, TX7MB)
P.O. Box 73
Frenchtown, MT 59834-0073
USA
TEL: (406) 626-5728
QTH: DN27ub
URL: https://eur06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.bigsky…
Skype: lanceW7GJ
2m DXCC #11 - 6m DXCC #815 - FFMA #7
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)!
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.
I am no longer active in EME and am offering the following items for sale.
I will provide full details, photographs and asking price on request.
Shipping OK in USA, possible out of USA but challenging now with mail
restrictions.
1. HA1YA ME2-XP 2m dual RX (EME) transverter 28 MHz to 144 MHz
up-conversion
2. Kuhne TR 1296 H - 144 S 1296 High Performance 23cm Transverter 144
MHz to 1296 MHz up-conversion. 0 - 500 mW input to 18 watts output
3. DEMI (built by Q5 Signal) L23HP 1296 MHz 25 watt Transverter | 28
MHz to 1296 up-conversion
Jim Spears
N1NK
Tiverton, Rhode Island
