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Was involved with building 6 sets of these back in 1971. Still have one set around for old time sake. The 1972 edition of the ARRL "FM and Repeaters for the Radio Amateur" book has a construction/tuning article for a 6-cavity 2 Meter duplexer using 4" diameter tubing, pages 106 to 111.
How does a vhf duplexer work
The drawing above shows a idea of the cavity for 430.7125MHz. Total length is 300mm, diameter 6 inches (152mm OD), the centre resonator diameter is a copper OD 42mm and 150mm long. Without the extra tuning rod added to the end plate the cavity with 150mm long centre resonator tuned to 435.7MHz.
How does a vhf duplexer work
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Ron, KC0QVT. #270: Tune a Duplexer with a Spectrum Analyzer + Tracking Gen or VNA. Watch on. Filed in: amateur radio , business radio , Commercial Radio , Duplexer , duplexer tuning , ham radio , Repeater. Previous article "Beat The Heat" Summer Sale Video. I've tuned a lot of duplexers over the years.
How does a vhf duplexer work
BCD-150150 VHF Duplexer. VHF Duplexers. Great for Amateur and Commercial Applications. If you need assistance, call us at 816-532-8451 and we can help specify the correct duplexer for your specific application. If you need 220 MHz / 1.25m duplexers, click HERE.
How does a vhf duplexer work
Duplexer for portable VHF repeater. For my undergrad EE capstone project I'm designing and building a 2m band analog amateur radio repeater. Our design goal is to build a solar-powered low power repeater (something like 5-20 watts) which can be carried in a backpack and easily deployed. The frequencies should ideally be software programmable.
How does a vhf duplexer work
VHF Cavity Duplexers 30-250 MHz A Duplexer is a 3-port device most commonly used to allow a transmitter and receiver, operating on different frequencies, to share a common antenna while operating simultaneously. The filters that make up the duplexer isolate the transmitter from the receiver by filtering out
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The WP-639 duplexer consists of four 5-inch cans. It covers the 2M band and can do 600 kHz spacing minimum if it was ordered that way. The WP-641 duplexer consists of four 8-inch cans. It covers the 2M band and can do 500 kHz spacing minimum if it was ordered that way. Of the two, the WP-641 has slightly better specs.
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Duplexer Types There are two basic types of duplexers, Band Pass and Band Reject. The easiest one to understand is the band pass duplexer. Figure 1 EMR Corp 22402 N. 19th Avenue Phoenix, Arizona 85027 Toll Free: 1-800-796-2875 Tel: (623) 581-2875 Fax: (623) 582-9499 www.emrcorp.com e-mail: [email protected] 2
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How does a vhf duplexer work
Alignment is simple. Apply a 145 MHz signal to the common terminal. Connect a power meter (SWR meter, directional watt meter or RF volt meter) to the 434 MHz terminal, and a 50 ohms dummy load to the 2 m terminal. Adjust the 145 MHz variable capacitor until the RF signal at the 434 MHz terminal dips to zero.
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94. Location. Miami, FL. Oct 29, 2013. #5. zz0468 said: For 2 UHF repeaters on a single antenna, the proper way to do this is use a single duplexer. The receive side of the duplexer feeds a multicoupler going to both receivers. The transmit side of the duplexer goes to a transmitter combiner, which consists of a dual isolator, and a band pass.
How does a vhf duplexer work
duplexers provide 80 to 90 dB of rejection and 6 cavity duplexers 110 to 120 dB when "new". Time and environmental conditions cause insertion loss to increase and rejection level change over time. If you have purchased used duplexers, don't be surprised if the cavities do not comply with the manufacturer's specs. 100 kHz - 3.0 GHz.
How Does An Antenna Duplexer Work
TYPES OF DUPLEXERS. There are many ways to combine filters to perform duplexer operations. The more common approaches are: Bandpass Duplexers: Bandpass duplexers use several filters to reduce the bandwidths of the transmitter output and the receiver input frequency bands. Cavities 1, 2 and 3 tuned to pass 458 MHz. 80 dB loss at 453 MHz.
How does a vhf duplexer work
Communication duplexers play a crucial role in repeater systems, particularly in VHF (Very High Frequency) and UHF (Ultra High Frequency) frequency bands. These devices enable bidirectional.
VHF 100W Duplexer for Radio Repeater with Multiple StopBand Filters Duplexer Signal Booster,8
pipe as the source of home-brew duplexer construction materials. Later I began making duplexers from spun-aluminum commercial cake pans. Both require no welding. Unfortunately the price of copper is today much higher. Cake pans, however, are still reasonably priced, readily available and very acceptable as the basis especially for VHF cavities.