Duplexer Radio
Duplexer Radio
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Icom VHF/UHF FM Transceiver IC-208H Features Encode/Decode 9600 BPS Packet Ready 500 Alpha Memories (6 character) Built-In Duplexer FM Narrow capability Weather Alert Three Output Levels Detachable Control Head Extended Receive 16 DTMF Memories... |
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Photosmart C309n TouchSmart Web All-in-One Printer w/Fax/Duplex/Wireless $359.99 Print lab-quality color photos and laser-quality documents with this wireless all-in-one printer. PC-free printing cabalities let you print photos directly from your mobile phone, Bluetooth-enabled device, iPhone or iPod touch. Edit and print photos, send faxes, make copieseven access and print coupons, maps or other web contentwithout ever turning on your PC via the extra-large HP TouchSmart scre... |
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HYT TR-800 45 Watt Repeater (Duplex Sold Separately) $1,999.00 The TR-800 is a compact, extensive specification 45-Watt Base Station / Repeater that enhances your analog conventional system seamlessly and cost effectively. Desktop design, remarkable flexibility and outstanding reliability make the TR-800 suit a wide variety of applications and can be easily integrated with your existing infrastructure. The radio configuration offers you maximum expansion of c... |
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RCA Antenna Satellite Diplexer Splitter $1.23 Allows off-air (UHF/VHF) or CATV and satellite (DSS) IF signals to be diplexed (combined) into one cable run to receiver.... |
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Comet CF-416A HF-VHF/UHF Transceiver Duplexer - 1.3-170Mhz & 350-540Mhz $48.99 Comet CF-416A Duplexer. 2 Input leads, 1.3-170Mhz, the other accepts 350-540Mhz. Use 2 seperate VHF & UHF radios on 1 DualBand antenna.... |
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ICOM CY5000 VHF Repeater $1,495.00 50 watt VHF repeater with cabinet and internal AC power supply. Compact low profile cabinet allows installation of optional duplexer and pre-selector for complete repeater system for desk or 19" rack mount. Ideal for single site repeater installations. Operates on 25, 12.5 or 6.25 kHz channel spacing spacing in either analog or IDAS (NXDN) operating modes. Optional networking capability for mul... |
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MICRO-1504-C4 4-Cavity Bp-Br Duplexer VHF, 250W w/FREE TUNING $1,280.00 Band-Pass / Band-Reject duplexer will provide frequency superior isolation between transmitting and receiving channels of a duplex radio systems. Due to right material choice and temperature compensated design temperature stability has been achieved. The resonators are made of extruded aluminum passivated inside and outside with the galvanized steel chassis and Teflon insulation has been applied i... |
What is the need for paired frequencies in FDD?
The radio
frequency band for cellular communication is
paired frequency band and is difficult to find . What is the need for PAIRED frequencies? Does the duplexer require paired frquencies?
I wonder why the need of paired frequencies!
Do you know why?Please tell me!
Cellular phones are full duplex (both parties can talk at the same time) so you need two frequencies, one for each caller, if you use frequency-division duplex (FDD).
It would be possible to use a single frequency if you had code-division duplex (CDD), where the go and return paths are differently encoded in some way, but this is not how the system was set up.