Antenna Systems Information. Back to Home Antenna Systems. Information(antennas, feedlines, duplexers,circulators, isolators, calculators. Compiled by Mike Morris WA6. ILQMaintained by Robert Meister WA1. MIK  Note that the contents of this page, like most here at. If you have something to share please consider writing it up and sending it in.

If you have relevant data sheets, class handouts or any other information that we do not have. Below is a Google ad (to help pay the bandwidth and hosting bill). Note that the OR parameter in. Google search must be in ALL CAPS. MFJ bought Hy- gain in May of 1. Then they purchased Cushcraft in August of the same year.

Jim's Antique Radio Museum - AMATEUR RADIO - antique radio virtual museum, vacuum tube radio, classic radios, vintage radios, radio collection, historical radio. THE CAR HACKER’S HANDBOOK. A Guide for the Penetration Tester. Craig Smith. User manual, users manuals, user guide, operating instructions. The ITS Tactical Ultimate Radio Communication Guide teaches you what to look for in a handheld HAM radio and upgrades and how to create your own comms. Warning: Invalid argument supplied for foreach() in /srv/users/serverpilot/apps/jujaitaly/public/index.php on line 447. Fake News Papers Fake News Videos. A Few Abbreviations.

Antenna Specialists was sold to PCTel (year?) - and their corporate web site is at. I was told recently that PCTel bought both Maxrad and Antenex (but I don't know the dates). Decibel Products was bought by Andrew, but they didn't want everything.

The leftovers (including. Spectra, located in Lewisville, Texas (the web site. From their web site: .

Electronic Circuit Schematics. Note that all these links are external and we cannot provide support on the circuits or offer any guarantees to their accuracy.

These products had been outsourced and db. Spectra. successfully brought them back and have since hired many of the personnel involved. Sometimes researching other manufacturer's web sites can save you.

Then you go to the . Unless you were familiar with crystal. B, which in many cases. So do your homework and learn. System Engineering. Introductory Information for System Engineering.

73 Magazine (also known as 73 Amateur Radio Today) was an amateur radio magazine that was published from October 1960 to September 2003.

READ THIS FIRSTGetting the most from your repeater system. By Kevin Custer W3. KKCRF Communications - A Non Technical. Approach   1. 4. 7 MB PDF By Decibel Products Corp.

Many years ago Decibel Products. RF hardware manufacturer) published a series of informative pamphlets on systems.

The earliest seems to be 1. The topics included Base Station. Antennas, Combiners, Selective Cavities, Duplexers, RF Transmission Lines and Lightning. DB made it available on their corporate.

MB local copy. here. This document. should be required reading for anyone wanting to learn about antenna systems. Worth printing and adding to your tech notebook. Help!! My repeater seems deaf   By Kevin K. Custer W3. KKCRepeater Sensitivity De- sense. Testing   3. 25 k. B PDF by Jacques Audet VE2.

AZXAn excellent writeup that explains the techniques plus shows how to build a high- isolation. Receiver. desense testing   By Karl Shoemaker AK2.

O of the Spokane Repeater Group. Original offsite link at the SRG web. Is a 3 d. B change in power really worth it? It's noted as being . Antenna Specialists RF TOOLS Series. Also called . They concluded that LMR- nnn and LMR- nnnn.

NOT recommended in any radio site RF environments, especially. NNN is any 3- digit number and NNNN is any 4 digit number).

While. i. DEN is (was?) a 9. MHz system the physics are the same at 2. MHz through 1. 29. MHz. Well worth. reading. HELIAX Coaxial Cable for Low Intermodulation. Generation   2. 1 k.

B PDF by Andrew Engineering. They wrote this one page writeup on why foil- braid cable causes intermod. Despite the fact that. Heliax there's a lot less sales pitch and a lot.

Worth reading. Where exactly is your repeater? Read this before you file any paperwork and help out your local coordination.

FCC or FAA citation. Donated by Eric Lemmon WB6.

FLYMIL- STD- 1. 88- 1. B . This handbook is.

MIL- HDBK- 4. 19. A . It is large, in two volumes. Volume one is 3. 96 pages of theory, volume two is 3. This download is the complete 2 volume set in one PDF file, and volume 2 starts. PDF file. This book covers grounding for safety, lightning, nuclear blast. A very good read and a real eye opener. This handbook is approved.

At one point (Feb 1. FREE if you ordered it from: Commanding Officer. Naval Publication and Forms Center. Taylor Avenue. Philladelphia PA 1. MIL- STD- 4. 64 ?

And lightning can have. High power amplifiers and duplex radio   Tubes vs. Technical Papers Index   An. PDF papers on Isolators, Duplexer retuning, Ferrite and Hybrid Combiners. Multicouplers, Preselectors, Bandpass and Pass- Notch Cavity Resonators. Using Preamps with repeaters.. Custer W3. KKCThe Effects of Trees.

Slant Propagation Paths   1. MB PDF By Vogel Hagn. This is an academic paper that will be of special interest to UHF, 9. MHz system owners. Best Practices Guide   4.

B. PDF By Motorola Inc. This is a write up on solving interference problems at 8. MHz and oriented towards Public Safety.

Interference Technical. Appendix   6. 82 k.

B PDF By Motorola Inc. This is intended to be an add- on to the . Also very worth reading. Calculating Your Radio Horizon. Radio Mobile   Coverage. Roger Coud. Scroll down to the Calculators section for them. A non- technical presentation of a rather complex.

A combiner has cavities as part of the unit.. Yes, there is. some repeated material between the articles, but if you're new to the topic, it won't. When you have multiple people writing on the same topic some repetition is. What's a circulator?

Properties of a Ferromagnetic. Circulator   By Kevin Custer W3. KKCThe Care and Feeding of the RF. Isolator   1. 18 k. B PDF file by William F. Founder, EMR Corporation. An. Elementary Introduction to Ferrite Isolators, Circulators and RF Loads   1 MB PDF file.

TX- RX Corp. The isolation. B with 5. 0 d. B typical. Data. sheet on the DB- 4. H- 2. C High Band Single Channel filter and isolator   9 k. B PDF file. This file describes a Decibel Products 1. MHz dual isolator but the directions apply to. The drawing is in error, it does not show the termination (a Bird Termaline) on the.

Cavities, Diplexers, Duplexers, Theory, and More. Introductory Information on Cavities, Diplexers.

Duplexers. READ THIS FIRSTIf you're just starting out, I strongly suggest that you read the above article, then first nine. Jacques Audet VE2. AZX, John Portune W6. NBC and by. William F. Yes, there is some repeated material between the articles, but if you're new.

The 9 articles collectively will give you a basic and solid education. About Duplexers   5.

MB PDF. By Decibel Products. From the preface: . A non- technical presentation. Well worth reading.

Theory and Testing of. Duplexers   1. 4 MB PDF by Jacques Audet VE2. AZXThis is a large (6. Again. well worth reading. Technical Duplexer Page with.

By John Portune W6. NBCUnderstanding. Maintaining and Re- Tuning Antenna Duplexers   1. Install Windows Xp Hp Mini 110 on this page. B PDF By William F. Lieske, Sr., Founder. EMR Corporation. A good basic theory writeup, including the differences between Band Pass and Band Reject. Combating. Spurious Output And Overloading With Cavity Filters   1.

MB PDF by TX- RX Corp. A ? Bryson of Communications Products Company, a. Phelps Dodge. A Guide to Duplexer Specifications   over 1. Paul Kelley N1. BUG (Contributions to the list are very welcome)Tuning.

Adjusting Vari- Notch- Duplexers   1. B PDF file by TX- RX Corp. A . Note that this is NOT a. Yet another implementation of a six meter filter   by Tim. Ahrens W5. FNAnother six meter Heliax notch filter   by. Jeff Otterson N1. KDO. A 2 Meter Band- Reject Heliax Duplexer   by Jim Poll WB5.

WPA (offsite link)Some Tests on Duplexer. Loops   2. 33 k. B PDF file by Jacques Audet VE2. AZXSome interesting observations, including scope traces.

GE Datafile Bulletin 1. A. 2. 5- 2. 50 MHz Quarter Wave Stub Filter   4. B PDF file by General Electric. They produced several useful RF engineering Data. File Bulletins (the ones we have are available for. GE LBI page at this web site).

This. one is subtitled. This bulletin describes the construction of a filter, useful for supressing. Meister WA1. MIKThese filters definitely do the job, meeting or exceeding manufacturer's specs. They cover the entire. MHz bands and have sharp cutoffs. If you need more filtering, they also sell.

B. These handle 2. A Homemade Duplexer for 2- Meter Repeaters. B PDF By John Bilodeau, W1. GAN (from the July 1. QST magazine)Note: In the 3.

BNC has fallen out. Type N connectors (and to a lesser extent the TNC connector) are much preferred over BNC. You must use double shielded coax in the harness. RG- 5. 5 is mentioned in the article. I'd use RG- 4. 00 and compensate on the inter- cavity lengths. If anybody has built this unit with.

Speaking of home- made cavities..