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Terrestrial Broadcasting
Terrestrial Television, Digital and Analogue
Switch Mode Power Supply Woes - New Aerial/Mast head amplifier.
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<blockquote data-quote="RustySpoons" data-source="post: 1057907" data-attributes="member: 412012"><p>Here is the latest reply from Antiference:</p><p></p><p>"Thank you for your patience Dale while I gather this information for you.</p><p></p><p></p><p></p><p>I have attached copies of the certificates for this model of PSU.</p><p></p><p>You will notice that the original applicant details are on the certificate as this product is not an Antiference original design.</p><p></p><p>As you know this power supply is a low cost unit and the case is very small, it was originally conceived 8 years ago and more than half million pieces have been sold worldwide without any complaints from customers about electrical performances and/or safety. As mentioned we really have a very low returns rate. The CE certification was granted some years ago as per the attached certificates.</p><p></p><p>Regarding the EMI filter; it was decided not to include it because we reached acceptable ripple even without it and also this would increase the size of the case.</p><p></p><p>With regards to the screening, you will have noticed that when you opened up the unit, it has included an epoxy resin within the case. This acts as a suitable screen in conjunction with the metal plate on the front of the RF part. The original design featured a metal case around this section but after some testing with the full screen, there was some undesirable harmonics and resonances at some frequencies so the design was changed. The combination of the metal plate and epoxy resin avoids any resonance or interference.</p><p></p><p></p><p></p><p>If you have any further questions, please let me know.</p><p></p><p></p><p></p><p>Kind regards</p><p><strong>Dan"</strong></p></blockquote><p></p>
[QUOTE="RustySpoons, post: 1057907, member: 412012"] Here is the latest reply from Antiference: "Thank you for your patience Dale while I gather this information for you. I have attached copies of the certificates for this model of PSU. You will notice that the original applicant details are on the certificate as this product is not an Antiference original design. As you know this power supply is a low cost unit and the case is very small, it was originally conceived 8 years ago and more than half million pieces have been sold worldwide without any complaints from customers about electrical performances and/or safety. As mentioned we really have a very low returns rate. The CE certification was granted some years ago as per the attached certificates. Regarding the EMI filter; it was decided not to include it because we reached acceptable ripple even without it and also this would increase the size of the case. With regards to the screening, you will have noticed that when you opened up the unit, it has included an epoxy resin within the case. This acts as a suitable screen in conjunction with the metal plate on the front of the RF part. The original design featured a metal case around this section but after some testing with the full screen, there was some undesirable harmonics and resonances at some frequencies so the design was changed. The combination of the metal plate and epoxy resin avoids any resonance or interference. If you have any further questions, please let me know. Kind regards [B]Dan"[/B] [/QUOTE]
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Terrestrial Broadcasting
Terrestrial Television, Digital and Analogue
Switch Mode Power Supply Woes - New Aerial/Mast head amplifier.
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