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#41
March 25th 08, 10:26 PM
posted to sci.electronics.design,rec.radio.amateur.antenna
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Narrow band antenna.
On Tue, 25 Mar 2008 13:55:16 -0700 (PDT), Artem
wrote: Nice close-up. Choking of some of the lines seems OK, but not the coax. http://img370.imageshack.us/my.php?image=d2eb0.jpg Could you find in this picture choke? What material is used in the ferrite? So, now where is the schematic of the biasing for these varicaps? If those two clear insulation lines are going to the loop, It's lines from resonance loop to amplifier. Does this mean the varicaps are across the loop? If so: it is going to be hard to apply DC to a dead short - or does that black shroud cover more than the varicaps? Now my Antenna in broken. I will fix my antenna mad make a web for schematics, software for calculation? etc. You've done it by parts already, so, sure. 73's Richard Clark, KB7QHC |
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#42
March 26th 08, 11:15 AM
posted to sci.electronics.design,rec.radio.amateur.antenna
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Narrow band antenna.
On Mar 26, 12:26 am, Richard Clark wrote:
On Tue, 25 Mar 2008 13:55:16 -0700 (PDT), Artem wrote: Nice close-up. Choking of some of the lines seems OK, but not the coax. http://img370.imageshack.us/my.php?image=d2eb0.jpg Could you find in this picture choke? What material is used in the ferrite? For transformer - low magnetic permeability (50) for chokes - high. So, now where is the schematic of the biasing for these varicaps? If those two clear insulation lines are going to the loop, It's lines from resonance loop to amplifier. Does this mean the varicaps are across the loop? http://img524.imageshack.us/my.php?image=antjy3.jpg |
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#43
March 26th 08, 03:26 PM
posted to sci.electronics.design,rec.radio.amateur.antenna
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Narrow band antenna.
On Mar 26, 5:40 pm, Richard Clark wrote:
On Wed, 26 Mar 2008 04:15:20 -0700 (PDT), Artem wrote: What material is used in the ferrite? For transformer - low magnetic permeability (50) for chokes - high. Unless you can be more specific, this sounds like the wrong material (which you have not specified - do you know what you used?). I'm use USSR ferrite 50HH. |
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#44
March 26th 08, 03:40 PM
posted to sci.electronics.design,rec.radio.amateur.antenna
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Narrow band antenna.
On Wed, 26 Mar 2008 04:15:20 -0700 (PDT), Artem
wrote: What material is used in the ferrite? For transformer - low magnetic permeability (50) for chokes - high. Unless you can be more specific, this sounds like the wrong material (which you have not specified - do you know what you used?). 73's Richard Clark, KB7QHC |
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#45
March 26th 08, 07:03 PM
posted to sci.electronics.design,rec.radio.amateur.antenna
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Narrow band antenna.
On Wed, 26 Mar 2008 08:26:52 -0700 (PDT), Artem
wrote: I'm use USSR ferrite 50HH. Google reveals all of one page in the entire Web that responds to that as a search term - and that page refuses to load. 73's Richard Clark, KB7QHC |
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