Re: MEASURING VSWR WITHOUT A DIRECTIONAL COUPLER

Hi John, All, The answer to your question is in my original e-mail on the subject. I said at the end... "One error that may creep in, is if the "device leg" of the "T" is extended with co-ax or is relatively long (>lambda/20)" Having dealt with the fundamental of the problem, it is up to the u

Re: MEASURING VSWR WITHOUT A DIRECTIONAL COUPLER

smatched source / cable / measurement receiver. One error that may creep in, is if the "device leg" of the "T" is extended with co-ax or is relatively long (>lambda/20) e-mail me direct if you want any more info Regards Tim Haynes tim.hay...@baesystems.com ---

Re: EEC compliance for a ground based radar

Hi all, AFAIK, radar (in the UK) are certified by CAA or by DERA Portsmouth. (DERA was what they used to be called - but I don't know what they are called now - unless its QinetiQ) CAA do air traffic radar etc. while DERA did marine radar. MoD radar came under MoD rules and were probably checke

Re: Equipment for own use (was gas appliance)

Hi Everybody... In the EU there is workplace legislation that in the UK is implemented under the "Provision and Use of Work Equipment Regulations" (PUWER) 1998. In these regulations anything that is provided for use at work is required to comply with the relevant Directives. If the equipment is

Requirements for Czech Republic

in UK) what about Czech. Republic? Electrical What are the colour codes for mains wire in use in Czech. Republic? Are they the same as EU? Thanks in advance for all the replies. Tim Haynes --- This message is from the IEEE EMC

Re: SLIM

he writing of the new Directive is concerned. However, there was no meeting of the SLIM Working Group in June, the meeting following that of February is 3/4 th July. I will let the group know if anything of substance turns up. Regards Tim Haynes --- This

Re: IEC 825 and Light Emitting diodes.

Hi all, Have a look at the following Hewlett Packard documents. Application Brief I-009 Application Brief I-015 Application Note 1109 These might help answer the questions. Regards Tim --- This message is from the IEEE EMC Society Product Safety Techni

Re: EN standard for pacemaker immunity

Hi everyone, Except for "official" certification - it is not the standard that is the most important. Consider the field strengths that the person (hence pacemaker) will be exposed to. Are the standards realistic or were they created to give a MINIMUM level of confidence to some authority? What

Equipment for development

Hi Everybody, I have some equipment that is currently under development for an American company. While the design of the equipment still has to be finalised, the customer requires a set of units to run on a simulator for test purposes. Apart from the obvious requirement that these development un

Re: Equipment designed and manufactured for use in-house

Carlos Perkins wrote... >Dear All, >A question from UK: > >Does anyone have a strategy for handling the Low Voltage and EMC >Directive requirements relating to equipment made for use in-house? > >By this, I mean test boxes, power supplies, break-out boxes, etc. > >These products are not meant t

Re: Feedback on EMC

Hm.. But who are you and who do I e-mail if I am interested?? Or did I miss something? Regards Tim Haynes - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (w

Re: NSA (using acid)

the throat after short exposure. Is it wise to "blow" the acid off with an airline as suggested in one of the other replies? Regards Tim Haynes - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the s

Re: Reducing magnetic influence on PC-monitors

BIG SNIP! >OK, if it is primarily a radiated path, then some aluminum foil >wrapped around the victim will produce some good results if the path >is the electric field. If the path is the magnetic field, this will >help slightly, but maybe not enough. But don't forget to let it breath! It can ge

Re: More on Signatory for US based Manufacturer

Hi All, DoC requirements of the EMC Directive are only a general statement of requirement. The actual implementing legislation is that of each of the member countries. In the UK, the implementing legislation is the "UK EMC Regulations" Statutory Instrument No: 2372 1992. What I think this says

Re: Laser pointers

# From: Rick Cooper # Subject: RE: Laser pointers # Date: Wed, 11 Nov 1998 09:43:19 -0500 # To: "'emc-p...@majordomo.ieee.org'" # # #> All, #> #> The seaside resort town of Ocean City, Maryland passed #> an emergency ordinance this past summer banning the use of t

Re: Room grounding

ot rely on any single source of information and I would _double check_ any contradictory advice. I hope this is some use... Regards Tim Haynes tim.hay...@gecm.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org wi

Re: Method CS114

Ed Price wrote: And what is an "Amp per Watt"? Is that a "mho", a unit of conductance? Or is it a unit of admittance, a Siemen? hm... Wasn't mho one of the Three Stooges or am I thinking of something else?! No - I won't admit to anything - (no 4th over here) (I'm sorry - it's Tuesday and for some

Re: Video and computers in racks

C compliance is determined by a 3rd party "Notified Body" and a "type examination" obtained. This would be in addition to the "type approval certificate" ! I hope that the information is a) accurate and b) not too off-putting.. Rega

Re: Emissions or not?

WoW! Replies! Rather than respond in person I acknowledge all replies with thanks and comment here. BTW the 144.8 MHz tx is 100W e.r.p. Reflections from the Green Italian car? Why not all the other cars? Over all the other days, weeks, years that I have been using these frequencies? Too much co

Re: Poll, Changes to the EMC directive

Whoa! and hello! The changes proposed are under the heading of SLIM - an acronym for simpler legislation ! However, even if the EC EMC legislation was rescinded would it remove the absolute responsibility of the manufacturer in the following areas? to make the product safe and to supply inst

Emissions or not?

Hello everybody! Isn't experience a wonderful thing? Well, I have just experienced something that makes me wonder about the validity of EMC emission regulations... I am a radio ham and operate on VHF and UHF bands from the car. The other night I was transmitting on 144.8MHz while the UHF receive

Re: Shielded power cord, seeking source for

ow is "due diligence" served? Just thought that I would ask! Regards Tim Haynes (tim.hay...@gecm.com) Disclaimer My mind is my own - blame no other for my thoughts.

Re: Do you need a license

ence was not needed. My licence covers 9kHz to 100GHz and for pulse / FM / AM modulations. If you do not use a screened room - then you Do need a licence! Regards Tim Haynes Regards Tim Haynes (tim.hay...@gecm.com) Disclaimer My mind is my own - blame no other for my thoughts. Num festinat t