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Chinese RF parts
G3RIR <g3rir@...>
I have just received some cables I specially ordered from rfsupplier_com in
China. The quality looks excellent and the price was very good and the delivery from order was just one week. I needed N male to N-female bulkhead using semi-rigid for my 23cm amp input which they made up to order. I found trying to find the matching cable and connectors too difficult on the Farnell site so I tried an e-bay search and came up with rfsupplier_com on e-bay. I paid by paypal. Does anyone have any experience as to the real quality of their products? Would someone like to test one of the cables on some proper test equipment? All I can do is measure the loss using a Bird and as they are only 30cm long there won't be much loss anyway, I suppose. Neil, G3RIR
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Crawley microwave round table
Chris G0FDZ
Hi folks
Details of the finalised program for the Crawley microwave round table are available on the UKuW group website and will appear in the next edition of Scatterpoint. The date for your diaries is Sunday 13th September and meeting is at the usual venue. Just a reminder that the UKuW group annual construction contest for the G3VVB trophy will take place at the event, so please finish off your projects and bring them along. Regards Chris G0FDZ
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July RSGB Low Bands UK Activity Contest - and other ramblings
g4bao
Condx seemed average, but I got on for the last hour and managed the following
23cms GM4CXM IO75tw 505km CW DF9IC JN48iw 647km CW GW8ASD IO83lb 236km SSB M0GHZ IO81vk 189km SSB G8OHM IO92aj 147km SSB I had two failed attempts on 9cms with DF9IC and PA0EZ I would echo Ray's earlier comments about the CW/JT4 debate in that we worked easily on CW in a fraction of the time that we would with JT4, and at quite low levels, and deep QSB. Ray and I rarely fail in our 23cms QSOs, and it's the same with Henning DF9IC. Don't get me wrong, I'm a big supporter of JT modes for the "telegrapically challenged" :-) but call me an oldie if you wish, I still get a buzz out of turning those dots and dashes in to information in my head! Just a pity I haven't got as effective a station and particularly, site, on 3cms, but the price of 10W PA devices for 3cms makes my toes turn up!! If I could find a surplus source of X band GasFets like the one I had for 23cm LDMOS devices, (dream on!) I'd design a cheap PA kit for 3cms as well. Anyone out there found a reel of 10W X band Fets in a skip recently? OK, enough rambling, off to service GB3CAM... 73 All John -- G4BAO QRV 23,9,3 and 1.2cm Beacon keeper GB3CAM/24GHz http://www.g4bao.com
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July RSGB Low Bands UK Activity Contest - Result
Ray <gm4cxm@...>
Hi all,
23cm band conditions appeared much below par for this session but despite a number of regulars being absent, activity levels were quite good though contacts did dry up for the last 40 minutes. One new initial contact this session was with Dave G8KBH Nr Blackpool running 10w on SSB. GM7GDE IO75 22 GM3SBC IO85 68 G3JYP IO84 196 GI6ATZ IO74 199 G8KBH IO83 247 GW8ASD IO83 332 G3OHH IO83 345 G8ATB IO83 348 G3NEO IO93 350 G8OHM IO92 425 G3VKV IO81 475 G4BAO JO02 506 M0GHZ IO81 521 G4EAT JO01 572 73 Ray GM4CXM IO75TW
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Re: Tonight - Microwave Activity Night, 7/20/2009, 8:00 pm
G4FRE
The lesson learnt was dont use the "internet time" setting option in windows xp.
toggle quoted messageShow quoted text
This morning I compared the result of using the windows XP internet method to set the computer, with the z3801 digital clock and found a 2+ second difference. Listening to WWV on 10MHz on the FT817 same difference. So I installed my NMEATIME program (as i paid for a copy many years ago I use this not Dimension4) and now the computer, z3801 clock and wwv all now agree within measurement error Dave, ww2r
--- In ukmicrowaves@..., SAM JEWELL <jewell@...> wrote:
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Rain Scatter on 10GHz – a (slightly) different approach!
Graham - G4FSG
A number of you are aware that I have a VERY poor take off on 3 and 6cm. The 60cm dish is about 8m agl with many trees up to about 20m at varying but fairly close distances. There are a few gaps, one of which is on a bearing of 122° but only +/- 2° at most. The gap is a result of vandals burning down the school cricket pavilion on the adjacent field several years ago on New Years Eve taking the trees with it!!!
Today I tried a different approach to the RS that was about. I simply left the dish pointed at the gap and tracked the rain cells crossing France and Belgium on http://home.hccnet.nl/uffe.noucha/weurope.htm . When they were roughly in the right place I monitored from my study using the SDR remotely from the shack with SDRxxServer. Once I could see LX1DB/B coming up then off I went to the shack. Using this technique I worked F6DKW (JN18), F1NXP/P (JN29) and DJ5BV (JO30) at 375, 376 and 434km. All three were new squares and DJ was a new DXCC making the total 10 squares and 5 countries. All were good strength – two on SSB and one on CW. The spread on the SSB was significant making copy extremely difficult.
All of this should be put into context – Simon, G3LQR, is only about 15km away and worked DL7QY (JN59) and DK5YA (JN49) at 59S but was using a different rain cell and I could hear absolutely nothing of either of them!
Moral of the story – if you have a poor location then work out where the gaps are and point there, study the weather maps and be patient……..
Graham G4FSG
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AS on G0GHK/B signals
Barry Chambers
Dear All
toggle quoted messageShow quoted text
I've seen several instances of aircraft scatter on G0GHK/B from Hemswell (IO93QJ94).See attached .jpg. The effect lasted several 10's of seconds. Distance is only about 25km and bearing from Hemswell to Finningley is 318 degs. I've tried monitoring the beacon from several sites around Sheffield but haven't seen any AS yet - the geometry isn't very auspicious, but I'll keep at it! I've also monitored G0GHK/B's keying characteristics. They are very repeatable but I haven't seen the phenomena that Dave reports. 73 Barry, G8AGN Quoting bernie <bernie@...>:
Dave,
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Re: 10/5.7/24GHz CUMULATIVES Sunday 26 JULY 2009 : ACTIVITY LIST
Ralph
QRV on Sunday26th July.
--------------------------------------------------------------------
G4ALY Home station IO70VL
0900 UTC - 2000 UTC (short breaks for meals)
10GHz 10W/75cm dish
5.7GHz 14W/75cm dish
Talkback 144.175 150W/13el yagi (interference
increasing)
KST at the same time.
-------------------------------------------------------------------
73 RALPH g4aly
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10/5.7/24GHz CUMULATIVES Sunday 26 JULY 2009 : ACTIVITY LIST
Peter Day <microwaves@...>
Hello folks...
In the absence of G3XDY who is away on holiday this week, I'm collating the activity list for this coming Sunday's contest. Please let me have your intentions in the following format and I'll put out a final list late on Friday, both on the reflector and also directly to some of you: ---------------------------------------------------------- G3PHO/P: Matchmoor Lane Winter Hill, IO83RO 0900 UTC-1800 UTC weather permitting 10GHz: 5W/1.2m dish 5.7GHz: 12W/1.2m dish 24GHz: Not taking it. Can't manage 3 bands solo! Talkback: Preferred: 144.175MHz ssb 50W/9el yagi Alternative: KST via 3G ---------------------------------------------------------- You may also be aware that BATC have organised their West Coast ATV Marathon activity day and contest for the same period. Details of this event have been posted in recent Scatterpoints, the most recent of which is the June 2009 issue. Please try to support this initiative as best you can by either: (1) Getting on 23cm ATV and/or 10GHz ATV from a suitable location ... OR (2) going out to a narrowbander's location and filming him ... OR (3) watching the live streaming at www.batc.tv, choosing LIVE EVENTS from the menu (if you are a narrowbander please remember to also come on the air to give the portables some points!) Most of the ATV activity is centred around NE Anglesey where there will be a powerful ATV repeater set up for the day and also from Winter Hill where G3SMU will be organising the local lads from his home location just below Matchmoor Lane. There will also be /P ATV people on Matchmoor Lane. Hopefully, one might come over to my station and do some outside broadcasting of what narrowband microwaving is all about:-) A third ATV node is that of GW3ZME/P who will be active from Cyrn Du, IO83DF08, NGR SH836733, a few miles SSE of Llandudno. Hope to both hear and SEE you on Sunday! 73 Peter G3PHO
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G4BAO 45W PA kit and GB3CAM/24 update
g4bao
Go to
http://www.g4bao.com 73 John -- G4BAO QRV 23,9,3 and 1.2cm Beacon keeper GB3CAM/24GHz http://www.g4bao.com
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More JT4 off the moon Thanks for all that high efficiency reflector junk left up there by the landings!
SAM JEWELL
Folks, A follow up to yesterday's JT4 tests with WW2R, off the moon, on 23cm System here up to 200W and 2.3 meter dish. Mostly around 150W output for JT modes System at WW2R. Remote operated up to 400W and 3.0 m dish. Mostly operated around 200W output for JT modes We resolved the timing issue between us. It wasn't that which prevented decodes on JT4G yesterday. Still no decodes on JT4G today. Path degradation at its lowest today according to Moonsked. Dave's signal very visible on SpecJT even at 200W output. CW would have been difficult (for me at least) Changing to JT65C decodes were close to 100%. A full QSO with lots of short random messages very successful. We then changed to JT4E. This time it worked almost 100%. Full QSO on JT4E Initial Conclusions The new JT4G decoder doesn't seem to be extending the detection threshold to -23dB for 23cm EME. Since our best reports were about -17 and averaging -20dB for this part of the session it is perhaps not surprising JT4G didn't supply any decodes (either direction). JT4E extends the detector to about -19dB. This seems to have been confirmed by the success on this mode today. Maybe, although we don't see the spread so much on SpecJT, the JT4G (and other 4 modes) were actually spread more than is visible? Maybe the problem is the doppler on the signal? The QSO took place about one hour after transit here. My doppler would have been close to maximum. Although the spreading may have been low, it was almost impossible with the TS2KX RIT to keep the traces vertical. The doppler would have 'spread' the energy, in one over, to maybe as much as 50Hz. I haven't calculated the doppler at transit plus 1 hour yet. So, most interesting. When Skype (used to co-ord our activity) dropped out at Dave's end JT4E provided the only reliable link between us so lots of short messages carried without error! Clearly, 23cm digital modes EME is quite viable between small backyard dishes of 2.3m and 3m diameter with modern low noise preamps and around 150 to 200W RF (in the shack)! At low degradation times of the month even CW will work well between these size dishes and system parameters. 73 de Sam, G4DDK
From: Ray To: ukmicrowaves@... Sent: Tuesday, 21 July, 2009 1:04:17 PM Subject: [ukmicrowaves] Re: Tonight - Microwave Activity Night, 7/20/2009, 8:00 pm --- In ukmicrowaves@..., Peter Day > Please look for me operating as G2AS/P from Sheffield Amateur Radio Club tonight (approx 1930-2100). > Calls wil be much appreciated as I'm trying to convert some club members to move higher than their 432MHz handhelds :-) > I'll also have mobile KST running for those who dont like calling CQ on 23cm :-) > Peter G3PHO Came on to try and support Peter's effort but guess he had some generator problems? Used the time waiting to good effect to address a question of RTTY activity and decided to give the mode a try on 23cm for the first time. Russ G4PBP and myself set up a schedule. Russ started with a long string of RY's that enabled me to pan the signal and line it up on the MMTTY decode markers but my initial impression of the received audio (horrendous flutter) was to consider this wasn't going to work. Initially just got jibberish on the screen, Russ's suggestion to try hitting the reverse control sorted that problem. I noted there is also an ability to take account of fluttery signals so that was pressed into service as well. The end result was a remarkably solid contact. We've agreed to give SSTV a try next time! I'd be interested to see how RTTY or FSK441 works with a contact dependent on aircraft reflection, using timed periods each way. Taking on board the conclusions some of you have reached so far on JT4, my own opinion is that it will be of greatest benefit to those for whom CW is not a mode of operation, in particular if using lower power levels and not being aircraft reflection dependant. Without exception, all my JT4G contacts and failed contacts could have been completed easily on SSB or CW and in the case of the failed attempt with Chris GW4DGU, we could have had several contacts. 73 Ray GM4CXM ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/ukmicrowaves/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/ukmicrowaves/join (Yahoo! ID required) <*> To change settings via email: mailto:ukmicrowaves-digest@... mailto:ukmicrowaves-fullfeatured@... <*> To unsubscribe from this group, send an email to: ukmicrowaves-unsubscribe@... <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
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New 13cm Personal Beacon
Ray <gm4cxm@...>
QSP from Ian GM0UHC
Hi All, I have just installed a 13cm personal beacon. Frequency is 2319.995+/-5KHz until it stabilises. Power into feed (6m of FSJ4-50B) . . . ~3W Antenna . . . JBeam Type 7362, horizontal polarisation, 60 degrees beamwidth. Beam Heading . . . 45 degrees . . . aiming at Forth Bridges. Location . . . IO85FW. Purpose . . . to 'squirt' a signal in the general direction of LA/SM/OZ whilst at the same time, exploring the scattering from the bridge metalwork. This has proved extremely effective on 23cm and 9cm. Signal reports obviously welcome, especially from stations West of IO85FW who are recommended to point at the Forth Bridges . . . obviously. 73, Ian GM0UHC
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Re: Tonight - Microwave Activity Night, 7/20/2009, 8:00 pm
SAM JEWELL
WW2R and I had some questions over our results off the moon on JT4G yesterday, so we are going to try again, later today. Specifically, timings seemed to be 'odd' although both of us are network synchronised. We will keep a better watch on the Delta T figure. Can I remind those of you using JT modes that you need to ensure your timing is spot on. I can recommend Dimension4 as a pretty good free timing source for your PC. Hoping to get on this evening. 73 de Sam From: Ray To: ukmicrowaves@... Sent: Tuesday, 21 July, 2009 1:04:17 PM Subject: [ukmicrowaves] Re: Tonight - Microwave Activity Night, 7/20/2009, 8:00 pm --- In ukmicrowaves@..., Peter Day > Please look for me operating as G2AS/P from Sheffield Amateur Radio Club tonight (approx 1930-2100). > Calls wil be much appreciated as I'm trying to convert some club members to move higher than their 432MHz handhelds :-) > I'll also have mobile KST running for those who dont like calling CQ on 23cm :-) > Peter G3PHO Came on to try and support Peter's effort but guess he had some generator problems? Used the time waiting to good effect to address a question of RTTY activity and decided to give the mode a try on 23cm for the first time. Russ G4PBP and myself set up a schedule. Russ started with a long string of RY's that enabled me to pan the signal and line it up on the MMTTY decode markers but my initial impression of the received audio (horrendous flutter) was to consider this wasn't going to work. Initially just got jibberish on the screen, Russ's suggestion to try hitting the reverse control sorted that problem. I noted there is also an ability to take account of fluttery signals so that was pressed into service as well. The end result was a remarkably solid contact. We've agreed to give SSTV a try next time! I'd be interested to see how RTTY or FSK441 works with a contact dependent on aircraft reflection, using timed periods each way. Taking on board the conclusions some of you have reached so far on JT4, my own opinion is that it will be of greatest benefit to those for whom CW is not a mode of operation, in particular if using lower power levels and not being aircraft reflection dependant. Without exception, all my JT4G contacts and failed contacts could have been completed easily on SSB or CW and in the case of the failed attempt with Chris GW4DGU, we could have had several contacts. 73 Ray GM4CXM ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/ukmicrowaves/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/ukmicrowaves/join (Yahoo! ID required) <*> To change settings via email: mailto:ukmicrowaves-digest@... mailto:ukmicrowaves-fullfeatured@... <*> To unsubscribe from this group, send an email to: ukmicrowaves-unsubscribe@... <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
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Re: Tonight - Microwave Activity Night, 7/20/2009, 8:00 pm
Ray <gm4cxm@...>
--- In ukmicrowaves@..., Peter Day <microwaves@...> wrote:
Please look for me operating as G2AS/P from Sheffield Amateur Radio Club tonight (approx 1930-2100). Came on to try and support Peter's effort but guess he had some generator problems? Used the time waiting to good effect to address a question of RTTY activity and decided to give the mode a try on 23cm for the first time. Russ G4PBP and myself set up a schedule. Russ started with a long string of RY's that enabled me to pan the signal and line it up on the MMTTY decode markers but my initial impression of the received audio (horrendous flutter) was to consider this wasn't going to work. Initially just got jibberish on the screen, Russ's suggestion to try hitting the reverse control sorted that problem. I noted there is also an ability to take account of fluttery signals so that was pressed into service as well. The end result was a remarkably solid contact. We've agreed to give SSTV a try next time! I'd be interested to see how RTTY or FSK441 works with a contact dependent on aircraft reflection, using timed periods each way. Taking on board the conclusions some of you have reached so far on JT4, my own opinion is that it will be of greatest benefit to those for whom CW is not a mode of operation, in particular if using lower power levels and not being aircraft reflection dependant. Without exception, all my JT4G contacts and failed contacts could have been completed easily on SSB or CW and in the case of the failed attempt with Chris GW4DGU, we could have had several contacts. 73 Ray GM4CXM
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Re: Yet more bits for sale - 18 GHz Frequency counter
Conrad Farlow <conrad@...>
Ok then how about 80 plus post- it's got to be worth that. Prefer selling on here than on eBay. I also have a JFW industries step attenuator 10dB total in 1dB steps, sma connectors. Spec here: http://jfwindustries.thomasnet.com/item/manual-variable-attenuators/manual-variable-attenuators-2/50r-248?&seo=110
toggle quoted messageShow quoted text
I'd like 20 for it Conrad Conrad Farlow wrote:
I have an Anritsu MS75B repeater checker which incorporates an 18 GHz frequency counter which gives 0.1 Hz resolution, a 10 MHz ref oscillator an ML73B power meter and a MA72A power sensor which did work but I killed it with a TWT! I believe that OZ8AFC may have a head for sale for around 200 Euro. There is also a signal generator which never worked. So basically it's a nice carry case with a good frequency counter and a 10 MHz OCXO in it. I would like 120 ono plus postage, it is pretty heavy!
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Fw: Re: West Coast uWave Marathon: 26 July
GM
Just a reminder for the "West Coast uWave Marathon"
this coming Sunday (26 July), 10:00 am to 16:00 (local time).
We shall be operating GW3ZME/P from Cefn
Du, IO83DF, around 347 MASL, south of Llandudno in N.
Wales.
QRV 3cm and 24cm ATV (wideband). Two stations on
3cm.
2 metre talkback (FM 144.750 +/- and 144.175
MHz SSB)
Other stations G3SMU and The Wirral Gang have said
they hope to be active too, in addition to those listed in the June edition
of Scatterpoint (Pg. 15).
Time to dust off and remove spiders from
those Solfan head units and modified LNBs !
73 Martyn G3UKV, Dave G8VZT
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TONIGHT - RSGB 1.3/2.3GHz Activity Contest, 7/21/2009, 7:00 pm
ukmicrowaves@...
 
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Re: EI3IX now active on 10ghz
Russ Stewart <g4pbp@...>
Tony Gallagher wrote:
Hi Tony I can try anytime, I you would pass on my Skype details andEmail. Russ ... g4pbp
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July RSGB Low Bands UK Activity Contest - Reminder
Ray <gm4cxm@...>
Hi all,
The July 23cm/13cm UK Activity Contest takes place tomorrow, Tuesday 21st July between 8pm and 10.30pm local time. I will be QRV on 23cm, 150w, 4x44. Talkback on ON4KST. Fingers crossed for another bumper evening of activity. 73 Ray GM4CXM
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Re: EI3IX now active on 10ghz
Tony Gallagher <tony_g_ireland@...>
Thanks for that Ralph,
73s Tony --- In ukmicrowaves@..., "Ralph Bird" <Ralph.Bird@...> wrote: ph> Ralph G4ALY
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