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Re: Activity list for the 5.7/10/24GHz Contests on Sunday 28th July
Callsign G3ZME/P
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Locator: IO82QL Bands: 5.7, 10 and 24 GHz Talkback: 144.175 SSB (preferred) + KST in afternoon Times: ~ 1000-1600 utc 73 Martyn G3UKV
On 21/07/2013 23:21, G3XDY wrote:
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Reports of r Microwave Europe column in Dubus
John Quarmby
The dealine for input for the next Microwave Europe column in Dubus is fast approaching. One area I will be covering in some depth is the recent Ofcom consultation on 2.3 and 3.4GHz, as other European countries are/will be facing the same issues, and a common approach on key allocations should prove beneficial.
I would be keen to include other news as well so please send any snippets and photos to me at my usual email address. Deadline is Wednesday 3rd August. 73 John G3XDY Microwave Europe joint editor, DUBUS Magazine
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GB3NGI on 10GHz
Gordon GI6ATZ
Hi All As well as updating the 2 mtr beacon on Thursday we also installed a new 10 Ghz beacon The 10GHz beacon is on 10368.895 ERP is 3dBW Antenna is a slotted waveguide Locator is IO65VB Gordon GI6ATZ
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Re: ERA-1
R Hopkins
Hi Geoff
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I'm running mine at 9936MHz with 115 ohms total bias resistor and an 8 volt supply as recommended by the manufacturer. I'm not sure what the current is but 75 mA is the absolute maximum according to the data sheet. I haven't noticed things getting particularly hot which one thing I would have checked when I was making the transverter. Best of luck with yours. Cheers Roger
On Fri, 26 Jul 2013 17:25:21 +0100 (BST), you wrote:
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Re: ERA-1
geoffrey pike
Hi Roger Well that is what i plan to use them for also, running them flat out to get the numbers i quoted and at 75 mA each i think they may not last for ever ! regards Geoff
From: R Hopkins To: ukmicrowaves@... Sent: Friday, 26 July 2013, 14:31 Subject: Re: [ukmicrowaves] ERA-1 Hi Geoff
I used them to drive the mixers in my 3cMs transverter. They worked perfectly. Cheers Roger GW4NOS On Fri, 26 Jul 2013 14:01:41 +0100 (BST), you wrote: >MiniCircuits dont specify the ERA-1 to 10 GHz but sort of give you the impression it should > >produce some useable results at 3cm >So i cascaded 2 onto a piece of RO3003 and measured the following at 10.368 GHz > >13 dB forward gain >Psat approx 9 dBm >So it does seem they would be useful at 3cm and they don't cost a fortune >regards >Geoff >GI0GDP
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Re: Activity list for the 5.7/10/24GHz Contests on Sunday 28th July
Roger Ray
John,
Activity as below: Callsign: G8CUB/P Locator: IO92XAKST should work this time... Phone: 07900 261121 if all else fails. Roger G8CUB --- In ukmicrowaves@yahoogroups.com, G3XDY <g3xdy@...> wrote:
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Re: GB3NGI Up and running with JT65B
Hi all, good sig here at 448km 73 Graham
132600 8 -14 2.1 -5 1 * GB3NGI IO65VB 1 0 132800 9 -11 2.1 -3 3 * GB3NGI IO65VB 1 0 133000 1 -9 2.1 -3 3 * GB3NGI IO65VB 1 0
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Re: ERA-1
R Hopkins
Hi Geoff
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I used them to drive the mixers in my 3cMs transverter. They worked perfectly. Cheers Roger GW4NOS
On Fri, 26 Jul 2013 14:01:41 +0100 (BST), you wrote:
MiniCircuits dont specify the ERA-1 to 10 GHz but sort of give you the impression it should
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ERA-1
geoffrey pike
MiniCircuits dont specify the ERA-1 to 10 GHz but sort of give you the impression it should produce some useable results at 3cm So i cascaded 2 onto a piece of RO3003 and measured the following at 10.368 GHz 13 dB forward gain Psat approx 9 dBm So it does seem they would be useful at 3cm and they don't cost a fortune regards Geoff GI0GDP
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Re: GB3NGI Up and running with JT65B
David Robinson
Producing nmea seems to be the lowest priority task on the Jupiter board. While working with VK6APH on WSPR for the HPSDR we saw up to 11 seconds offset for NMEA
The good news is that the binary output from the Jupiter is much more accurate and stable, so we used that without issue
Dave
G4FRE
From: ukmicrowaves@...
[mailto:ukmicrowaves@...] On Behalf Of Andy Talbot
Sent: Friday, July 26, 2013 7:05 AM To: ukmicrowaves@... Subject: Re: [ukmicrowaves] GB3NGI Up and running with JT65B
The G3RUH GPSDO used as time and frequency reference for this beacon, is known to be late sometimes with its NMEA data, but this does vary, randomly. Apparantly, it is a characteristic of the Jupiter type GPS receiver used to deliver the 10kHz reference.
Andy G4JNT
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Re: GB3NGI Up and running with JT65B
Yes, I can confirm it is running at DT = 2 seconds.
Just got one decode at -22dB plus the occasional A/S reflection showing on SpecJT
The G3RUH GPSDO used as time and frequency reference for this beacon, is known to be late sometimes with its NMEA data, but this does vary, randomly. Apparantly, it is a characteristic of the Jupiter type GPS receiver used to deliver the 10kHz reference.
Fortunately, being late makes no difference to decoding sensitivity, and can actually be "good". As JT65 is designed priimarily for EME, the receiver time-search routine is assymmetric to allow for 2s of EME delay. It covers approximately -1.5s to +6.5s. So a transmitted signal being late by two or three seconds maximises the chance of hitting a PC clock that is randomly off by a few seconds.
I've also just noticed the Tonna just hastily put-up to listen on 144 has a VSWR of something like 4:1 or higher, so summat is very wrong. Yet it still got 'NGI !
Andy
G4JNT
On 26 July 2013 12:33, Martin Andrew <martin.andrew@...> wrote:
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Re: GB3NGI Up and running with JT65B
GM6VXB
Here, NGI is -14dB and DT=2.0 seconds (P/C time
within 0.2 sec) with the occasional
multi path and aircraft scattered
signals.
Another (probably more) useful
beacon.
Since GB3VHF's site move a few years ago I need
tropo or A/S to hear JT65 so NGI could
prove more useful.
Martin, GM6VXB
(IO97aq)
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GB3NGI Up and running with JT65B
GB3NGI on 144.482MHz is up and running with its new driver transmitting JT65B.
SSB Reference tuning point (so called "Dial Frequency") for WSJT decoding 144.4812
G0API reported a decode at -23dB S/N immediately after tuning to the frequency, without actually being able to hear anything by ear.
Andy
G4JNT
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Re: Activity list for the 5.7/10/24GHz Contests on Sunday 28th July
Keith GW3TKH
Callsigns: GJ3TKH/P & GJ4HQX/P Locator: IN89WG Bands: 10GHz 10W 60cm dish 10GHz 1W 45cm dish. 24GHz 0.5W 47cm dish.
Talkback: 144.175MHz. 07762 885015 Times: Throughout the day, when available, weather dependent!
From: G3XDY To: "ukmicrowaves@..." Sent: Sunday, 21 July 2013, 22:21 Subject: [ukmicrowaves] Activity list for the 5.7/10/24GHz Contests on Sunday 28th July The third of the summer series of 5.7GHz, 10GHz and 24GHz contests is
coming up next Sunday, 28th July, you can choose any 6 hour time slot from 0700-1900 BST, either as one continuous period or two segments with at least an hour's gaps between. As usual I will collate an activity list, so please send me your operating plans. Lets hope for some rainscatter to liven things up this time! The preferred format is as below: Callsign: G3XDY Locator: JO02OB Bands: 5.7GHz 15W 60cm dish 10GHz 10W 60cm dish Talkback: ON4KST and 144.175MHz Times: Probably early and late in the day. 73 John G3XDY UkuG Contest Manager
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5.7/10/24GHz contest Sunday
microwaves <microwaves@...>
I am planning to be QRV for some of Sunday operating for the first time from my new home QTH at IO93GG. Since I have no VHF or UHF antennas up at present I'm forced to do something I said I never would do .... use only KST for liaison! Fortunately that shouldn't drop out at home like it often does when /P ! Details: G3PHO Home station Chesterfield, IO93GG Times: On and off from 0900z-1600z 10GHz only: 5 watts..60cm offset dish on veranda,c.12ft agl.Good take off from 135 through 180 to 300 degrees.
"Talkback": ON4KST chat room. or phone 01246 260308 Peter, G3PHO
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Re: MSF
Until recently, (within the last few years, anyway) the need for an external antenna, or at least a good view of the sky was necessary making a small domestic clock non-viable The latest, third generation GPS receiver modules that use deep search techniques can now make an indoor antenna a reasonable proposition so a bedside clock does become more feasible.
These new receivers (and I only know details about the one I first met, back in 2006 ish designed by QinetiQ) digitise the entire incoming signal from every satellite in view storing the entire set of samples in a large memory, several megs long. Many seconds worth of it. That memory space is then searched in three dimensions (Doppler, time and code space /satellite number) to extract everything about every satellite in view to facilitate faster lockup and more reliable tracking.
The result is a receiver that can maintain lock at sensitivities some 20dB below that required for the 2nd generation receivers and can lock up from a warm start in a couple of seconds, with a cold start in something like 30s. Those QQ modules were designed with the aim for use in Police Tetra radios, but looking at the situation a few years afterwards, it is obvious many manufacturers were working along the same lines as car sat navs, hand helds and the like suddenly became a lot more sensitive and locked up faster. It was quite a sudden improvement
Mind you, tiny MSF receiver modules manufactured in bulk for embedding in clocks only cost pennies. GPS receivers are many times more expensive, at perhaps a couple of pounds each. So you're unlikely to see a domestic GPS clock other perhaps than in very specialist shops. The Junghans MSF one I bought back in 1990 cost something like £60 as far as I recall - that was sold more as a scientific instrument.
Andy
G4JNT
On 25 July 2013 19:33, Michael Scott <g3lyp@...> wrote:
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Re: Activity list for the 5.7/10/24GHz Contests on Sunday 28th July
Ralph
Hello John,
I will be QRV Sunday.
Callsign: G4ALY
Locator: IO70VL
Bands: 5.7GHz 14W 75cm offset
dish
10GHz
10W 75cm offset dish
Talkback:144.175MHz
Times: early morning and
late in the day.
73
Ralph
G4ALY
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Re: MSF
Michael Scott
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Interesting project for the shack, but not suitable
as a bedside alarm!
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Re: Activity list for the 5.7/10/24GHz Contests on Sunday 28th July
Thanks Tony, that's good to know.
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You'll probably be easier from my second location with the Isle of Man out of the way - I could hear you from that area last October (when I was running 0.7mW!). 73 John GM8OTI
--- In ukmicrowaves@yahoogroups.com, "Anthony Horsfall" <x600@...> wrote:
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Re: Activity list for the 5.7/10/24GHz Contests on Sunday 28th July
Anthony Horsfall <x600@...>
John,
Check out GB3NGI beacon on 10368.895, locator
IO65VB, which became qrv today, bet you receive it really
strong from IO74NP
Look for you on Sunday at some point
73 Tony G4CBW
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