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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
C-Band Reception, UK and Europe
ESTV on Arabsat 5C @20 East
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<blockquote data-quote="Vipersan" data-source="post: 806644" data-attributes="member: 325666"><p>Ok ..my new AB switch arrived today ...</p><p>after fitting the Notch filter effect was considerably less ..though not totally dismissed.</p><p></p><p>I shall be using both switches to fully isolate the DX ..direct feed ...but first I had to open the original to peek inside ..</p><p>Pictures attached..</p><p>What I did find was no corrosion so why in one position was this effect occurring..</p><p>The only thing I could find was that one of the contacts was much higher physically than the corresponding contact on the other side ...thus the gap isolating the contacts was smaller...it is logical therefore although only a few pico farads this capacitance would be higher ..</p><p>I can only conclude the reduced isolation ..and increased capacitance in a die cast box was producing what is in effect a 'tuned' circuit which was acting as a notch T filter ..and specfic only at this one IF frequency ..</p><p>widening this gap has solved the specific frequency problem ..but may well shift it causing dropout at some other frequency ...thus I shall employ another level of isolation in the form of a second switch ...</p><p>one on the source ...and one on the destination ..</p><p>Told you my switching system is complex ...and a little unorthodox.</p><p>Anyway ..</p><p>Problem solved.</p><p>rgds</p><p>VS</p></blockquote><p></p>
[QUOTE="Vipersan, post: 806644, member: 325666"] Ok ..my new AB switch arrived today ... after fitting the Notch filter effect was considerably less ..though not totally dismissed. I shall be using both switches to fully isolate the DX ..direct feed ...but first I had to open the original to peek inside .. Pictures attached.. What I did find was no corrosion so why in one position was this effect occurring.. The only thing I could find was that one of the contacts was much higher physically than the corresponding contact on the other side ...thus the gap isolating the contacts was smaller...it is logical therefore although only a few pico farads this capacitance would be higher .. I can only conclude the reduced isolation ..and increased capacitance in a die cast box was producing what is in effect a 'tuned' circuit which was acting as a notch T filter ..and specfic only at this one IF frequency .. widening this gap has solved the specific frequency problem ..but may well shift it causing dropout at some other frequency ...thus I shall employ another level of isolation in the form of a second switch ... one on the source ...and one on the destination .. Told you my switching system is complex ...and a little unorthodox. Anyway .. Problem solved. rgds VS [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
C-Band Reception, UK and Europe
ESTV on Arabsat 5C @20 East
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