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EMC (was Valuable light)
Grant Hodgson <grant@...>
John
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In reply to your EMC request, message #13010, it's not very clear what you are asking. You've bought a 28V switched-mode PSU which was made by one of the most respected names in the industry (Lambda), which is a good start. You say that you hope to use it for 'some old Mutek kit', but you don't say what. And your request for EMC/RFI advice confuses me - what advice do you want? You bought a standard product which meets the relevant EMC specs, so presumably you're not about to open it up to fix it or try and improve it - or are you? Some SMPSs can generate noise and hash, both radiated and conducted, but often this is not as big a problem as some would have you believe. And sometimes it is - it just depends on what you are trying to do. Usually even OT questions get an answer, assuming that somebody does actually know the answer, but it's much easier to answer a direct question rather than a vague one. regards Grant G8UBN
Hello Sam and all
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Re: Valuable light
SAM JEWELL
I can't wait!
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Ian Lamb wrote:
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Re: Valuable light
SAM JEWELL
I suspect, John, that it was more a case of don't know. I don't think there is any real off topic prejudice as long as the subject is in some way related.
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If you repeat your question I suspect you may get some answer. Interference from SMPSUs is a very important subject and yesterday I was speaking to someone who also suffered a problem similar to the one you described. My own 27V SMPSU causes enormous problems on HF.One local told me about an output filter he used that successfully cured similar problems. Hoping this reassures you. 73 de Sam John Rooney wrote:
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Re: Valuable light
Ian Lamb <ianlamb@...>
wait a little longer and you might end-up with the real thing Sam
Ian ________________________________ From: ukmicrowaves@yahoogroups.com on behalf of SAM JEWELL Sent: Tue 15/01/2008 18:34 To: ukmicrowaves@yahoogroups.com Subject: RE: [ukmicrowaves] Re: Valuable light I think I've found next month's column photo....... Sam graham <graham.d@orange.fr> wrote: At 16:20 15/01/2008, Ian Lamb wrote: >- can you imagine me in a Jacobite shirt, 5 yard kilt, leather sporran and >kilt hose? yep.....and very smart it looks too....... http://www.rfham.com/g8mbi/kilt4.jpg <http://www.rfham.com/g8mbi/kilt4.jpg> Graham
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Re: 0,6 m offset dish
Martin Phillips <martin@...>
In message <360614.13663.qm@web30712.mail.mud.yahoo.com>, Liviu Babi
<electronicguest@yahoo.com> writes I ask the company who sold me that antenna for some details (f/D, gain,<Delurk> I don't recall anyone mentioning the HDLANT21 programme which does calculations for oval shaped offset feed dishes (as well as lots of other antennae). Google on HDLANT21 - it's a small DOS routine. </Delurk> Martin/ -- Martin E Phillips http://www.g4cio.demon.co.uk Homebrewing, black pudding, boats, morris dancing, ham radio and more! The Gloucester-Sharpness canal web page http://www.glos-sharpness.org.uk
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Re: Valuable light
SAM JEWELL
I think I've found next month's column photo.......
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Sam graham wrote:
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Re: Valuable light
Ian Ropper <gm0uhc@...>
Owing to the reflector's propensity to shuffle and
often delay messages by up to several days, I cannot claim to be following the
current thread regarding kilts, tartan and such like.
However I am proud to let you know that I do own a
kilt and guess what? . . . My tartan is Gunn!!
73 Ian, GM0UHC
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Re: Valuable light
SAM JEWELL
My wife's tartan is Mc Gillivray.
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I don't know if there is a Ballantyne tartan, but that would be mine....... I won't be at Bath for the dinner. It sort of clashes with SEVHFs, so you won't see me in a kilt. But Ian? No excuses! Sam Ray wrote:
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Re: Valuable light
Ian Lamb <ianlamb@...>
I agree Richard, even seems like some of us will be wearing skirts next!
Let me know what measurements you need Ray and I will send them directly ... I guess inside leg isn't needed? :-))) 73 .. Ian G8KQW ________________________________ From: ukmicrowaves@yahoogroups.com on behalf of Richard Newstead Sent: Tue 15/01/2008 17:59 To: ukmicrowaves@yahoogroups.com Subject: [ukmicrowaves] Re: Valuable light --- In ukmicrowaves@yahoogroups.com <mailto:ukmicrowaves%40yahoogroups.com> , "Ray" <gm4cxm@...> wrote: What a strange place this is. Did no-one ever warn you not to sit in front of open waveguides? Seems like conclusive evidence regarding harmful radiowaves to me ;-) 73 Richard G3CWI
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Re: Valuable light
John Rooney <gm1tdu@...>
Hello Sam and all
Sometimes what seems to be little “off topic” is really so useful that no excuse need be offered for a posting about it. The nightlight you’ve discovered is a good example and I for one will be looking out for it at my local Lidl. Thank you.
A few days ago, I put up a request for EMC advice on a SMPS I’d bought, which attracted zero relies, possibly because it was considered “off topic”. This disappointed me; the group is populated by many people who are infinitely more knowledgeable than I on all matters radio-related, and someone in this group will have particular expertise concerning SMPS-generated EMC issues. But no one has chosen to reply.
Am I wrong to suspect an “off topic” prejudice?
HNY to all
John GM1TDU
From:
ukmicrowaves@... [mailto:ukmicrowaves@...] On Behalf Of SAM JEWELL
Folks, this may appear a little off topic, but if you consider safety important, then maybe not!
Our local branches of Lidl are selling a very cheap portable 'night light'. This is a 3 x AA cell battery-powered LED light with built-in PIR motion detector for just 2.99UKP. This is phenomenal value. The unit can be placed anywhere that is in darkness and seems reliably to detect movement up to 3 - 4m away. The 3 bright LED lights then stay on for about 30 sec or so to light your way.
Absolutely essential for finding the bathroom in the middle of the night, without having to turn on the main light, after a heavy night socialising at the local radio club!
They should be easy to hack if you wanted to turn them into an intruder alarm with radio link from the shack.
These are currently on special at our local stores from Monday to Wed this week. We know from the 'level hunt' last summer that different areas of the UK offer specials at different times. Check the Lidl on-line site for availability locally. A must have.....!!
73 de Sam, G4DDK
No virus found in this incoming message. No virus found in this outgoing message.
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Re: Valuable light
Richard Newstead <g3cwi@...>
--- In ukmicrowaves@yahoogroups.com, "Ray" <gm4cxm@...> wrote:
What a strange place this is. Did no-one ever warn you not to sit in front of open waveguides? Seems like conclusive evidence regarding harmful radiowaves to me ;-) 73 Richard G3CWI
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Re: Valuable light
Ray <gm4cxm@...>
If both you gentleman can email me your sizes and whether you'd
prefer a white or black Jacobite shirt then I'll see what I can do ;-) 73 Ray. --- In ukmicrowaves@yahoogroups.com, "Ian Lamb" <ianlamb@...> wrote: Watch not here) sotartans are available but not bad for £24.99.Fortunately, the Cornish kilt is black (I could explain why, but Dylon might be a possiblity... But then you'd have to persuade meto wear one. That hasn't yet been accomplished by anyone!
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Re: Valuable light
Ian Lamb <ianlamb@...>
I'm not afraid! .. and Graham's picture looked quite good, NOT!
So, I challenge you Mr Bartram - you wear one & I'll wear one! 73 .. Ian G8KQW ________________________________ From: ukmicrowaves@yahoogroups.com on behalf of Chris Bartram Sent: Tue 15/01/2008 17:00 To: ukmicrowaves@yahoogroups.com Subject: Re: [ukmicrowaves] Re: Valuable light Ray To answer Chris, unfortunately...Mackenzie, Douglas and Black WatchFortunately, the Cornish kilt is black (I could explain why, but not here) so Dylon might be a possiblity... But then you'd have to persuade me to wear one. That hasn't yet been accomplished by anyone! Vy 73 Chris GW4DGU
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Re: Valuable light
Chris Bartram <yahoo@...>
Ray
To answer Chris, unfortunately...Mackenzie, Douglas and Black WatchFortunately, the Cornish kilt is black (I could explain why, but not here) so Dylon might be a possiblity... But then you'd have to persuade me to wear one. That hasn't yet been accomplished by anyone! Vy 73 Chris GW4DGU
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Re: 0,6 m offset dish
Chris Bartram <yahoo@...>
Hello Peter
The recommended feed horn for these offsets(usually they have an f/D ofThe W2IMU horn is an old design now and there are better dual-mode feed designs available. It's also quite difficult to fabricate properly. That's particularly true of the mode generating flare, which has to be made quite carefully if the horn is to work properly. Any old plumbing fitting won't do; it MUST have the right flare angle (to a couple of degrees) to work properly. You were lucky enough to find a suitable one - when I last made an IMU-type horn, I was reduced to fabricating my own flare from sheet copper... More recent work by some Russians (Skobelev et al) has made the design of the mode generating part of a dual-mode horn much simpler to design. It's possible to get excellent performance with a simple step in circular waveguide size. That's so much easier to fabricate than a flare! The information is all in Paul Wade's on-line book, or you could look at the brief note I wrote independently on a Skobelev-type feed for a TV offset dish in Scatterpoint about 18months ago... I can provide the reference for the original Skobelev paper if anyone is interested, but W1GHZ's work over the last couple of years has gone quite a long way beyond that. I looked at this again recently when I was designing a new feed for my EME dish, and I've come-up with a very simple way of performing the impedance transformation from the circular waveguide of a Skobelev type feed to a standard WG20 flange. I've also designed a version for my 10GHz Skobelev horn to match directly to WR75. Unlike Paul's transformation (for WG16 at 10GHz) fabrication doesn't require access to a mill! Once my brother finishes making the new horn I'll measure the performance, and maybe write it up, along with the similar horn and transitions I use on 10GHz EME. Vy 73 Chris GW4DGU
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Re: Talkback
Chris G8BKE
In GM land in our 3cms wideband days when George GM3OXX/P did "summits" he used to take along a homebrew ~0.5W SSB 2m rig not much bigger than an FT817 and a three element 2m "back -packing" beam and that was quite adequate for 100km+ talkback . Of course he would hear our Belcom Liner 2's easily...in many places!
73 de Chris G8BKE
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Re: Valuable light
graham <graham.d@...>
At 16:20 15/01/2008, Ian Lamb wrote:
- can you imagine me in a Jacobite shirt, 5 yard kilt, leather sporran and kilt hose?yep.....and very smart it looks too....... http://www.rfham.com/g8mbi/kilt4.jpg Graham
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Re: Valuable light
Ray <gm4cxm@...>
--- In ukmicrowaves@yahoogroups.com, SAM JEWELL <jewell@...> wrote:
the Bath Microwave RT evening dinner?
I'm sure it would Sam. I've added a picture in the photo section! To answer Ian....yes...I think you would look great and the sporran would come in very handy for your tackle! To answer Chris, unfortunately...Mackenzie, Douglas and Black Watch tartans are available but not bad for £24.99. 73 Ray GM4CXM Ian Lamb <ianlamb@...> wrote:sporran and kilt hose? each week! with the levels. That became an administrative nightmare and took a lot more time than I thought it should. On the other hand I've never seen sporans advertised down here, somaybe someone will be desperate enough to do a trade with you! 40yahoogroups.com> , SAM JEWELL <jewell@> wrote: beddingThis is even more "off topic!" whereas here you can treat yourself to a Jacobite shirt, 5 yardkilt, leather sporran and kilt hose............a must have!
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Re: Valuable light
SAM JEWELL
I believe the equivalent Ipswich Radio Club award is the Papua New Guinea (PNG) award. Maybe John or Graham could comment? Maybe we should have a suitable Microwaver award? A 723A/B inside a sporran? The sterilizer award? Ray could provide the sporrans if he can get down to Lidl's on Monday! Sam Ian Lamb wrote:
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Re: Valuable light
Ian Lamb <ianlamb@...>
Well can do Sam, I'm also due to receive the wooden spoon award
that night for my comments re: 5MHz so could be a fun evening. ________________________________ From: ukmicrowaves@yahoogroups.com on behalf of SAM JEWELL Sent: Tue 15/01/2008 15:41 To: ukmicrowaves@yahoogroups.com Subject: RE: [ukmicrowaves] Re: Valuable light It would be an interesting sight. Maybe official dinner wear for the Bath Microwave RT evening dinner? Sam Ian Lamb <ianlamb@btconnect.com> wrote: pah not a chance of a swap! - can you imagine me in a Jacobite shirt, 5 yard kilt, leather sporran and kilt hose? Keep up the good work Sam, it saves us having to check LIDL's site each week! ________________________________ From: ukmicrowaves@yahoogroups.com <mailto:ukmicrowaves%40yahoogroups.com> on behalf of SAM JEWELL Sent: Tue 15/01/2008 14:37 To: ukmicrowaves@yahoogroups.com <mailto:ukmicrowaves%40yahoogroups.com> Subject: Re: [ukmicrowaves] Re: Valuable light I am not going to repeat my offer to buy them for p! eople as I did with the levels. That became an administrative nightmare and took a lot more time than I thought it should. On the other hand I've never seen sporans advertised down here, so maybe someone will be desperate enough to do a trade with you! Good luck, Ray. 73 de Sam Ray <gm4cxm@yahoo.co.uk <mailto:gm4cxm%40yahoo.co.uk> > wrote: --- In ukmicrowaves@yahoogroups.com <mailto:ukmicrowaves%40yahoogroups.com> <mailto:ukmicrowaves%40yahoogroups.com> , SAM JEWELL <jewell@...> wrote: > > Folks, > this may appear a little off topic This is even more "off topic!" > > These are currently on special at our local stores from Monday to >Wed this week. We know from the 'leve! l hunt' last summer that >different areas of the UK offer specials at different times. Check the >Lidl on-line site for availability locally. A must have.....!! They certainly do differ! As of next Monday in Sam's area you can treat the wife to new bedding whereas here you can treat yourself to a Jacobite shirt, 5 yard kilt, leather sporran and kilt hose............a must have! 73 Ray GM4CXM PS No LED sensors left up here.
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