Qex

Fig 1 is a block diagram of the dual synthesizer module. There are two VCOs each followed by a passive power splitter and a separate buffer amplifier. The UHF VCO is designed for use with coaxial ceramic resonators in the 800- to 2500-MHz range. The VHF VCO is L-C tuned and designed for operation in the 50- to 500-MHz range. The high-integration dual-PLL IC is connected to both VCOs and combines two synthesizer functions in one package. A shared reference frequency is provided to individual PLL...

The American Radio Relay League

The American Radio Relay League, Inc, is a noncommercial association of radio amateurs, organized for the promotion of Interests In Amateur Radio communication and experimentation, for the establishment of networks to provide communications in the event of disasters or other emergencies, for the advancement of radio art and of the public welfare, for the representation of the radio amateur in legislative matters, and for the maintenance of fraternalism and a high standard of conduct. ARRL Is an...

Koo

Fig 5 The effect of C2 and L1 on the T-network of Fig 3 is shown by holding C1 at a fixed value. great deal. Here, LI and C2 are fixed at 2.25 iH and 100 pF, while CI is varied between 15 and 200 pF in 1-pF steps. Fig 5 shows the effect of capacitor C2 on the T-network it just varies the reactance, as you might expect. You can also infer the action of the inductor via the discrete steps. Here, CI is fixed at 15 pF, while C2 is varied in 1-pF steps. any RLC matching network. Modern software...

Ctune Cb

From this you should be able to derive the dielectric constant. Typically you will find only three common dielectric materials in use. These are er 21, 36 and 88. All of the techniques used in the UHF oscillator design and analysis can be applied to the VHF oscillator. The VHF oscillator consists of Q1 and the feedback capacitors Cll and C12 and provides a negative impedance to tuning elements L5, CIO and varactor diode CR3. In some cases Cll will not need to be...

Mmic Amplifier Design Upc2709 Ham Radio

Kvco The tuning rate of the VCO 10 MHz V 5 MHz V KO The phase detector gain constant 0.159 mA rad 0.159 mA rad Check the MFG data sheet RFopt The output operating frequency 2000 MHz 300 MHz Fref The frequency the phase detector sees 100 kHz 100 kHz N The division ratio RFopt Fref 20000 3000 fp The loop bandwidth, wider for 1000 Hz 1000 Hz faster lock times lower for lower phase noise Op Determines the PLL response to 45 45 step change. Usually set to 45 but can range from 25 -70 if need be....

High

At long last, the proven HAL DSP Modem architecture, modes, and software are available for applications that cannot use plug-in PC cards. While the DSP4100 closely follows the concepts of the PCI-4000, now you get CLOVER-II and high-performance TOR, Pactor, and RTTY in a stand-alone DSP modem. Requiring only 0.25A from a 12V battery, the 2.75 lb DSP4100 will go anywhere you can take your LAP-TOP PC and transceiver. Software changes are easily made in the field. Just pick-up new software from...