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Locked Re: Preamplifier
John, I wouldn't recommend a Ramsey kit to anyone. Their components are the cheapest possible grade, the circuitry uses minimal bypassing and decoupling and board quality very poor. You can buy
By qrpbear · #259 ·
Locked Re: Preamplifier
Niki, The parts should be available from Mouser Electronics, Digikey, Ocean State Electronics, Dan's Small Parts and a number of other sources. Ocean State's online catalog is probably the easiest
By qrpbear · #258 ·
Locked Re: Preamplifier
oh man i thought this was lopantennas! </sarcasm> hehehe Scott
By Scott Savage KC7WDG <kc7wdg@...> · #257 ·
Locked Re: Preamplifier
Uh... we are all on the Loopantennas list already. ;') Steve --- Scott Erwin <n4zou@...> wrote: ===== Steve Greenfield // Digital photography, scanning, Polymorph Digital
By Steven Greenfield AE7HD · #256 ·
Locked Re: Preamplifier
Bear and Scott (and all), Thanks for prompt reply :). Michael, Could you please recommend one or two of these "mail-order sources", ones which you know. I still prefer to wait and see if someone
By N.Kantor <nkantor@...> · #254 ·
Locked Re: Preamplifier
Ramsey sells a kit that should work, you can order direct or from one of the several electronics suppliers that carry their products
By SG2112@... · #255 ·
Locked Re: Preamplifier
Niki, Lyle Koehler's preamp works very well but I don't know of any source of a kit for it. The parts are all relatively common and should be available from any number of mail-order
By qrpbear · #253 ·
Locked Re: Preamplifier
You might want to check out the loopantennas yahoo group. http://groups.yahoo.com/group/loopantennas/ --- "N.Kantor" <nkantor@...> wrote: _______________________________ Do you Yahoo!? Declare
By Scott Erwin <n4zou@...> · #252 ·
Locked Re: Homebrew Butterfly capacitor, 12,000 volts!
I already have a photo of the capacitor uploaded in the photo section as stated in the original post. Here is a web page that details how to build your on capacitors.
By Scott Erwin <n4zou@...> · #250 ·
Locked Preamplifier
Hello All, I' have built a shielded loop for SW (1M diameter) which works very nice. Now I want to build a preamplifier for that antenna. I have found a scheme for an amplifier on the Net by Lyle
By N.Kantor <nkantor@...> · #251 ·
Locked Re: Homebrew Butterfly capacitor, 12,000 volts!
Please post pictures and diagrams of your new loop and butterfly cap. I am very interested in building the same thing, except mabe for 80 & 160. Also, please give us details on the performance of
By furman2020 <k5qa@...> · #249 ·
Locked Homebrew Butterfly capacitor, 12,000 volts!
I just finished a project I have been working on the last few weeks. A large Butterfly capacitor for my soon to be built 20 and 40 meter transmitting type Magloop. It is 10-pF minimum and 100 pF
By n4zou <n4zou@...> · #248 ·
Locked Re: Slinky
I actually had two slinkies in my apartment bedroom along two adjacent walls (~12 ft long for each slinky). The only time I ever made a contact with them was with them on 40m and the other station was
By Daniel Reynolds <aa0ni@...> · #247 ·
Locked Slinky
Did you know there is 57 feet of coiled steel in a slinky. As a loop, three in a triangle, as a shortened dipole, vertical hung from a tree. Any ideas,
By Jerome <jeromeg@...> · #246 ·
Locked Re: Indoor antenna question
Jeff, Not too sure about the 51J3 but some of the old Collins commercial receivers had two antenna inputs. One was 50 Ohm with a coaxial fitting and the other was a nominal 500 Ohm with screw
By qrpbear · #245 ·
Locked Re: Indoor antenna question
It makes no difference to the performance of the antenna if the wire used is coated or bare. However, if you're using it inside then you really want that nice plastic covering! Also same with the wire
By Scott Erwin <n4zou@...> · #243 ·
Locked Re: Indoor antenna question
Hi Jeff: You may use your wife for a form to hold the 1,000 feet of number 12 awg solid wire, and place it next to the window closest to your Collins. You'll get great reception with no hassles from
By c.e.boyd · #244 ·
Locked Indoor antenna question
A couple general antenna questions - is bare wire to be preferred to plastic coated wire? Thicker wire better than thinner? I own a Collins 51J-3. I'm using about 20 feet of ordinary speaker
By Jersey Jeff <jwewers@...> · #242 ·
Locked Re: RG-8/RG-213 voltage rating
I have used RG213 to approximately 10,000 volts to feed power to the anode choke of a driver stage in a high power transmitter operating in the HF bands. At this voltage level, the breakdown points
By Paul Lynas · #241 ·
Locked Re: New file uploaded to loopantennas
Ditto! In 6 weeks you will have enough oxidation built up around those joints that the transmit efficiency will drop like a stone. Connection resistance on transmitting loops needs to be held to an
By qrpbear · #240 ·