 |
207-647-3327; 888-SHIVELY (888-744-8359); FAX 207-647-8273 5 PM - 8 AM Eastern, emergencies only please - cell: (207) 329-5118 |
|
| Employee Webmail | Shively E-Mail | |
|---|---|---|
|
207-647-3327; 888-SHIVELY (888-744-8359); FAX 207-647-8273 5 PM - 8 AM Eastern, emergencies only please - cell: (207) 329-5118 |
|
| Employee Webmail | Shively E-Mail | |
|---|---|---|
| Antenna models | |
| Typical elevation patterns | |
| Icing Protection: | Radomes |
| De-Icers | |
| Transformers | |
| Related Information: | Tech bulletins |
| Tech sheets | |
| Bandpass filters | |
| Notch filters | |
| Branched combiners | |
| Balanced combiners | |
| Directional couplers | |
| Power splitters | |
| Low-level group delay equalizers | |
| Related information: | Tech bulletins |
| Tech sheets | |
| Calculators | |
| Shively Is Different! | |
| IBOC filter modules: | Medium-power |
| Low-power | |
| Very-low-power | |
| Digital injectors | |
| Interleaved A/D antenna | |
| Related information: | Tech bulletins |
| Tech sheets | |
| Calculators | |
| Shively filter selected for HD Radio™ demo in France. (May '06) | |
| 4 Times Square expands with new interdigital technology. (July '05) | |
| Revolutionary IBOC test at Cougar Mountain. (August '02) | |
| Shively's position on Dielectric's IBOC patents. | |
| CAUTION: All components are designed for use up to 108 MHz unless otherwise specified. Please contact Shively Labs for UHF components. | ||||
| Type "N" | ||||
| 7/8" | Flanged | Non-flanged | ||
| 1-5/8" | Flanged | Non-flanged | ||
| 3-1/8" | Flanged | Non-flanged | ||
| 4-1/16" | Flanged | Non-flanged | ||
| 6-1/8" | Flanged | Non-flanged | ||
| Cross-references: | ||||
| Old part numbers to new | ||||
| From Myat part numbers | ||||
| From Dielectric part numbers | ||||
| From SWR part numbers | ||||
| Related tech bulletins: | ||||
| Coax components specifications | ||||
| Patch panel dimensions (425 kB) | ||||
| Motorized transfer switches |
| Directional couplers |
| Digital injectors |
| Power splitters |
| Low-level group delay equalizers |
|
| Tough terrain, wicked weather, maximum coverage – nobody does it better! |
|
| Shively News | |
|---|---|
| Personnel changes: Joe Rohrer retires; Dale Ladner promoted to fill his shoes. | |
| Shows | |
For free guest passes, enter ticket #16078. |
|
| Awards | |
Shively Labs has won a techINK 2010 Innovation Award for our Graphical Power Meter system! |
|
 Our Model 6020 antenna brings home the Radio World Coolstuff Award! |
|
| Articles | |
|
May-June 2008 Radio Guide article: September 2007 |
|
Should any problems arise later with your antenna, it will be extremely helpful to know what the system’s characteristics were when it was new. We recommend you perform the tests in this section after installation. The first step is to characterize the transmission line by itself; then add the antenna and characterize the system as a whole. We recommend the following:
Before connecting the antenna, terminate the coax transmission line in an instrument-quality 50-ohm load. Measure and record the voltage standing wave ratio (VSWR). File this information with this manual for future reference.
The VSWR of the transmission line should be within the manufacturer’s specifications. If it is, proceed. If not, you should call the transmission line manufacturer before connecting the antenna. Problems must be worked out with the design engineer on a case-by-case basis.
With the transmission line still terminated in 50 ohms, make a time domain reflectometer (TDR) plot. Label and file the plot with this manual.
You tested the VSWR of the transmission line alone. Now test the VSWR of the system as a whole.
If VSWR is not satisfactory, check to be sure all the radiators are functioning (see below). If they are, call Shively Labs to help identify the problem.
Again using the low-power test equipment to provide a signal to the antenna and read VSWR, have the rigger detune each radiator in turn. The simplest way to detune a radiator is to short across its uprights, for instance with a screwdriver or wrench.
If you have radomes, you don’t need to remove each radome to detune the radiator. Have the rigger take a three-foot-square section of chicken wire or a similar metal mesh and place it on the top of each radome in turn, or simply place his hand in the same spot on the flat surface of each radome in turn.
Each time, a deflection in VSWR should be apparent. The deflection for various bays should be similar, but not necessarily identical. If the VSWR of the array does not change when a radiator is detuned, that bay is not functioning. Check to be sure the radiator was installed properly, including the inner conductor connector.
If you cannot find the problem, please call Shively Labs before proceeding.
 |
Printer-friendly Adobe Acrobat version |
|---|---|
| Get Acrobat Reader (free download) |
We'll be in Amsterdam at IBC 2010, September 10-14.