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| UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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cool item
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#2
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cool item
On 24/12/2020 19:54, Jim GM4DHJ ... wrote:
https://www.ebay.co.uk/itm/LNA-Low-N...AOSwnEFf403 A Does it make Radio 3 sound any better ? |
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#3
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cool item
Why should it have anything to do with FM as a modulation type? An amplifier
needs many attributes, one of the problems with wide band amplifiers is overload with strong signals If that occurs then the resulting non linear effects cause mixing to occur, and then the band is full of spurious stations made up from bits of those already there. I'm sure we have all heard the effect where a station appears to have two programmes on at the same time on frequencies which should be clear, masking any weak stations and causing mush and burbling sounds. This is the area where I do worry about the current design of receiving equipment, as the software defined radio often has a wide band amp at its head. This is where the device tends to get most of its problems. Brian -- This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... Blind user, so no pictures please Note this Signature is meaningless.! "Andrew" wrote in message ... On 24/12/2020 19:54, Jim GM4DHJ ... wrote: https://www.ebay.co.uk/itm/LNA-Low-N...AOSwnEFf403 A Does it make Radio 3 sound any better ? |
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#4
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cool item
On 25/12/2020 08:52, Brian Gaff (Sofa) wrote:
Why should it have anything to do with FM as a modulation type? An amplifier needs many attributes, one of the problems with wide band amplifiers is overload with strong signals If that occurs then the resulting non linear effects cause mixing to occur, and then the band is full of spurious stations made up from bits of those already there. I'm sure we have all heard the effect where a station appears to have two programmes on at the same time on frequencies which should be clear, masking any weak stations and causing mush and burbling sounds. This is the area where I do worry about the current design of receiving equipment, as the software defined radio often has a wide band amp at its head. This is where the device tends to get most of its problems. Brian titter titter |
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#5
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cool item
Brian Gaff (Sofa) wrote on 25/12/2020 :
Why should it have anything to do with FM as a modulation type? An amplifier needs many attributes, one of the problems with wide band amplifiers is overload with strong signals If that occurs then the resulting non linear effects cause mixing to occur, and then the band is full of spurious stations made up from bits of those already there. Brian - The description of the item bears no relationship to the actual item which is for sale. The actual item is some sort of mechanical equipment - not radio based equipment. It's some sort of strange mixup by the seller. |
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#6
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cool item
On 25/12/2020 11:50, Harry Bloomfield wrote:
Brian Gaff (Sofa) wrote on 25/12/2020 : Why should it have anything to do with FM as a modulation type? An amplifier needs many attributes, one of the problems with wide band amplifiers is overload with strong signals If that occurs then the resulting non linear effects cause mixing to occur, and then the band is full of spurious stations made up from bits of those already there. Brian - The description of the item bears no relationship to the actual item which is for sale. The actual item is some sort of mechanical equipment - not radio based equipment. It's some sort of strange mixup by the seller. I thought it was some kind of torture/exercise device. Further down: ================================================== ====================== Featu €¢ PGA hand-cranked grinder, used with a full-surface grinding machine, with a simple pressing roller for convenient grinding. €¢ Double roller design, no need to adjust the center, hold the workpiece between the wheels when holding, you can get concentric circles. €¢ The left and right direction of the rotating roller can be adjusted to make the workpiece or retreat and then grind. €¢ The pressure screw on the pressure arm can adjust the pressure and match the punch of different sizes to make it more stable. €¢ The products are well-made and ensure the high of the products. ================================================== ====================== -- Max Demian |
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