the paraboloidal reflector antenna in radio astronomy and

The Paraboloidal Reflector Antenna in Radio Astronomy and

The Paraboloidal Reflector Antenna in Radio Astronomy and Communication: Radio astronomers have developed techniques of calibration of large reflector antennas with radio astronomical methods, but these have not been comprehensively described. This text aims to fill this gap, taking a practical approach to the characterisation of antennas. All calculations and results in the form of tables and figures have been made with Mathematica by Wolfram Research. The reader can use the procedures for the implementation of his own input data.

Venus 30 astronomy telescope, Catadioptric reflector,...

Venus 30 astronomy telescope, Catadioptric reflector, mirror 76mm, focal length 600mm, eyepieces fx and hx, tripod stand. Not sure if all parts are here. Approx years old, good clean condition. £, Heathfield,.

Sky-Watcher Skyhawk Astronomy Reflector Telescope,

Hi for sale Sky-Watcher Astronomy Reflector Telescope, Foud in new home when move in previous owner left. No other accessories only what on pics. Any questions please feel free to contact me. Pictures of actual item what you see is what you get. Can deliver or post Thank

Tasco x 76mm Astronomy Reflector Telescope with

Tasco x 76mm Astronomy Reflector Telescope with accessories Used but in Fantastic condition Tasco Telescope Ideal for a beginner or enthusiast Tasco Information Study the heavens with the Tasco 280x76 Astronomical Reflector. Utilizing a 3" mirror to gather light, this powerful device features 20mm and 5mm eyepieces plus a 5 to 18mm erecting zoom eyepiece and a 2X Barlow to provide a maximum magnification of 280X. It offers slow motion elevation adjustment with a yoke mount and stabilizer bar. Other features include 700mm focal length, 5x24mm finderscope with crosshair, moon filter, and adjustable wood tripod with accessory tray. Comaes with full instructions, and Philips Guide to Stars and Planets book, pages and Philips Star Chart. Cost over £100 new will accept £40 ono

Ascom SE MTR Radio +Antenna and pole in Mansfield

Ascom semrt radio in a little carry unit with speaker and a mic clip ideal for the little excursions up over the hills dxing in good working order and a scaffold pole and a new dipole antenna WOULD PREFARE COLLECTION AND UK ONLY. TEL

ham radio triband antenna and 20 meter in Newport

i am selling a vertical ham radio antenna it covers and 20 meters and can be mounted at ground level without the use of radials and is resinant on those 3 bands so no ATU is needed... i believe it is called a jaybeam triband antenna (tho im not possitive) I have used this and had great reports from many worldwide stations... new antenna means this is now surplus to requirements..... ideal for someone with limited space and works well... buyer can collect.... any questions please ask and i will help if i can

HF Antenna MQ36SR Antenna amateur radio hf antenna

MQ-36SR TGM Six Band Three Element Hybrid Quad director Antenna with rotator and coax ect. Been using this for a few years and loved it. Good front/back rejection even 10ft off the ground. Beam was pound new but been replaced now by the newer version. comes with pole, rotator, coax ect. Electrical Specifications Operating Bands: Metres  Forward Gain (+/-0.5dB)- 10M-7.0 dBd.,12M-7.0dBd., 15M-7.0 dBd., 17M-6.4dBd.,20M-6.0 dBd.  SWR @ Resonance (See Curves)  Power Rating: Watts P.E.P  Front to Back Ratio: 15 to 20 dBd  Front to Side Ratio: -25db.  Input Impedance: Single 50 Ohm Feedline  Rotor: Medium to Heavy Duty TV  Mechanical Specifcations Element Length: 11 Ft 9 inches  Boom Length: 10 Ft 3 inches  Turning Radius: 8 Ft 3 inches  Overall Quad Reflector Height: 48 inches  Weight: 26 lbs  Mast (not inc'l): up to 2 1/8 inch  Wind Loading: 3.1 Sq. Ft.  Wind Survival: 75 MPH  Read More

HF Antenna MQ36SR Antenna amateur radio HF antenna

MQ-36SR TGM Six Band Three Element Hybrid Quad director Antenna with rotator, controller, and coax ect. Been using this for a few years and loved it. Good front/back rejection even 10ft off the ground. Beam was pound new but been replaced now by the newer version. comes with pole, rotator, coax ect. Buyer will need to disassemble it to see how to put it back as it's tuned and very complicated beast. Many thanks Electrical Specifications Operating Bands: Metres  Forward Gain (+/-0.5dB)- 10M-7.0 dBd.,12M-7.0dBd., 15M-7.0 dBd., 17M-6.4dBd.,20M-6.0 dBd.  SWR @ Resonance (See Curves)  Power Rating: Watts P.E.P  Front to Back Ratio: 15 to 20 dBd  Front to Side Ratio: -25db.  Input Impedance: Single 50 Ohm Feedline  Rotor: Medium to Heavy Duty TV  Mechanical Specifcations Element Length: 11 Ft 9 inches  Boom Length: 10 Ft 3 inches  Turning Radius: 8 Ft 3 inches  Overall Quad Reflector Height: 48 inches  Weight: 26 lbs  Mast (not inc'l): up to 2 1/8 inch  Wind Loading: 3.1 Sq. Ft.  Wind Survival: 75 MPH  Read More

VHF Marine radio and Antenna

RECENT RS/507m vhf marine radio brand new never fitted with new Sirio SB3M 3/4 wave antenna which is also brand new these items are no longer needed cost £160 grab a bargain Will consider sensible offers Ad ID: Delivery Service Consumer Credit

Numerous cb and ham radio antenna for sale

I have many home base antennas for sale for ham radio and cb. Also got many bits like plugs and mounts. If interested..please get in touch will post if needed. Read more

Status 530 tv and radio antenna with booster system

Antenna fitted then removed after few months for sat dish booster never fitted. See pictures Ad ID: Delivery Service Consumer Credit

Books about the earth, space and astronomy

Selling on behalf of my grandad. £3 each or £10 for all 4. Open to offers. Lots more books too! Ad ID:

The world treasury of physics, astronomy and mathematics

the world treasury of physics, astronomy and mathematics contains over 800 pages, consisting of works from Richard Feynman, George Gamow, Albert Einstein, Max Planck, Isaac Asimov and many more. this book is a first edition, and is in good condition. there is, as can be seen in the photo, some writing on the inside cover. Buyer collects, or delivery can be arranged. Read more

Audioline CB Radio With Magnetic Car Antenna in Liverpool

Audioline CB Radio With Magnetic Car Antenna These are becoming hard to find now in good working order & condition

In Car Radio Digital TV Antenna With Amplifier FM 4.2M Wire

SKU: , Material:Polycarbonate; Color:Black; Dimensions (cm):27X2X2CM; Weight (kg):0.15KGS; Type:TV Receiver Boxes Antennas

Astronomy Book(ASTRONOMY HACKS)Tips & Tools for Observing

Like New, Great value book for all types of Astronomy Enthusiasts Amateur & Professional..Read the back cover pic full of useful info..Don't really know why I'm selling this? Should keep it for when I get an another Scope..A Bargain like new.over 377plus pages.Port Talbot SA12 6TG....Postage inc in price.

In Car Amplified Radio Dvb-T Atsc Antenna Fm Sma Plug 4.5M

SKU: , Material:PVC; Color:Black; Dimensions (cm):27 x 5 x5; Weight (kg):0.11; Make:Audi,BMW,Honda,Nissan,Toyota,Volkswagen,Seat,Skoda,Passat,Opel; Year:; Type:TV Receiver Boxes Antennas Buy Now

Cb Radio/Antenna

Hi all im after a mobile Rig for my car any help would be great. Read More

Indoor radio antenna

I have a superb scanner antenna, that's in mint condition, that covers 25 to mhz, so please get in touch with me!

Ham radio antenna

Tandy Radio Shack duel band mobile mag mount. In very good condition and perfect working order. COLLECTION ONLY Read more

HAM RADIO Antenna

ALA magnetic loop receiving antenna. Wellbrook Comms. ALA P with power supply/coax and full instructions. Little use indoors.

Amateur Radio Antenna

Diamond D 130 J, 25 to MHz antenna...good condition £60

Glomax TV / Radio Antenna.

Glosmax TV / Radio Antenna (V +) Ideal for Caravans / Motor Homes / Boats. Unused and in original box. Ad ID: Delivery Service Consumer Credit

Glomax TV / Radio Antenna.

Glosmax TV / Radio Antenna (V +) Ideal for Caravans / Motor Homes / Boats. Unused and in original box. Ad ID: Delivery Service Consumer Credit

VHF Marine radio antenna

This is a fibreglass and plastic antenna complete with fixing bracket and swivel connection, together with connection lead to radio Read More

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