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wrote: Hi Dave, Hard disk drive platters can be made of two materials, aluminium alloy or glass. Most common 3.5" hard drive platter use aluminium alloy coated with the ferro magnetic layer for the

John, At the bottom of the Wellbrook ALA-1530 information page, there is a calibration chart which show the Aantenna factor vs frequency. It indicates that the antenna factor is roughly 8 over most of

Hey Everyone; Newbie/first poster here. So 'hello'. Been following the Wellbrook saga with great interest. Warning: While not a hands-on expert, I have read enough about active loops to be concerned

A new amplified loop design has been posted by Dallas Lankford on kongsfjord.no - inspired by postings by John KC0G on this group. Bob

Hello Rob The left hand scale is in dB, and is the correction which would need to be applied to get a unity antenna factor. So the actual performance is the inverse of the scale. One would expect the

I was taking apart some old disk drives and had a thought. Could the old disk platters be used to construct capacitors. They are rigid. I am not sure what they are made of. Dave

Hi Dave, Just got home. I wasn't planning on shorting the aluminum tube to the center condicutor of the cable. Just to the shell of the BNC connector, which doesn't have any power on it. Thanks for

Rob, I just found my 1530 instruction sheet and it reminded me that the coax has DC voltage on it (for the circuitry up at the loop base)so don't short it out. Also, it does say to NOT ground the coax

Hi Dave, Well the shield is grounded by the time it gets into the house but maybe I'll try it both ways. That may take a little longer. Rob

Ref. Is it shoelded or not ? Didn't we read earlier in the groups messages that Patrick had been kind enough to dismantle an ALA1530 ? Surely if Patrick says his dismantled ALA1530 had connections

Hi Rob, I think I'd try something I'm more sure is grounded. If I remember correctly, the coax shield between the loop and the electronics is NOT grounded. I seem to remember the installation

where Oh. That's very different. Never mind. Chris ,----------------------. High Performance Mixers and / What's all this \ Amplifiers for RF Communications / extinct stuff, anyhow? / \

I have one up a tree and can try that tonight. I assume that grounding the aluminum loop to the shell of the BNC connector is what you're referring to? Rob there (aka which

Does someone have a Wellbrook loop in a convenient enough location to ground the shield and see what happens? If it's the antenna, then it won't act like one when grounded. If it's not the antenna,

Nigel is correct. The Wellbrook isn't a shielded loop antenna. There are actually two wires that run into each leg aluminum loop that provides structural support for the antenna and come out the other

hi Rob, regarding the ALA1530: there is indeed a wire that from the PCB into the Al tube, but this is connected with the tube by a small screw, about 2cm away from the plastic enclosure. So, in my

Patrick is absolutely correct in stating that the aluminum shield (aka the outer conductor)is the actual antenna. This is the manner in which shielded loops function at their operating frequency. At

Patrick, You are wrong that the Aluminim is the actual antenna. There are wires inside of it and it is only there as a mechanical support. I know this because I've removed the potting material from