VHF drivers for Microwave local oscillators Dave Robinson WW2R, G4FRE
North W5HN
Texas
History
NTMS Microwave Society
1. My DEMI xverter drifts on 1296 EME (but 10G one doesnt!). Need to fix especially for JT65c 2. Been looking at DMK type circuits for a while; unexpectedly poor phase noise 3. WA1ZMS had given presentation at Martlesham Round Table on 134GHz equipment which renewed my interest in solving the problem using Direct Frequency Synthesis
North W5HN
Texas
Generic DFS
NTMS Microwave Society
OUTPUT =(C * R) +- (R * B /A)
North W5HN
Texas
WA1ZMS DFS
NTMS Microwave Society
North W5HN
Texas
DFS9096 Block Diagram
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North W5HN
Texas
NTMS Microwave
First wanted to try 90MHz multiplier/filter circuit of WA1ZMS design
MULTIPLIER
FILTER
Society
AMP
North W5HN
Texas
Multiplier Prototype
NTMS Microwave Society
With mod amp 10dBm in at 10MHz gave 13.8dBm at 90MHz. With crystal filter could be used as driver for 2304/144 Local oscillator
North W5HN
Texas
90MHz Mult/Filter/Amp output
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Note: Stray signals around 90MHz are VHF Broadcast stations (due to lack of screening)
North W5HN
Texas
74F161 Divider
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A, B, C, D pulled up internally, therefore preset (DCBA) = 1011= 11. 74161 will count down from 16 to 11 = 5 before resetting. Choose Q output that has closest to 50% duty cycle
North W5HN
Texas
G4DDK DFS96
NTMS Microwave Society
North W5HN
Texas
G4DDK Unit
NTMS Microwave Society
North W5HN
Texas
WW2R DFS9096
NTMS Microwave Society
North W5HN
Texas
DFS9096
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North W5HN
Texas
6MHz signal into mixer
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North W5HN
Texas
96MHz output from mixer
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North W5HN
Texas
96MHz Crystal Filtering
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Crystal filter improves medium and far out phase noise as well as broader spectrum
North W5HN
Texas
96MHz O/P
NTMS Microwave Society
North W5HN
Texas
Summary
NTMS Microwave Society
• Technique good for some frequencies but impossible for others with 10MHz reference • Output = (C * R) +- (R * B / A ) • Easy Freqs to achieve: 92, 98, 116, 101MHz • Harder Freqs to achieve: 106.5, 101.5, 94.75
collaboration with Alcatel Space Industries. References. [I]. L. Dussopt, G.M. Rebeiz "High-Q Millimeter-Wave. MEMS Varactors : Extended Tuning Range and.
The last two standards allow a relatively low division ratio ..... standard measurement techniques with a reference synthesizer would not provide enough.
resolution of passive acoustic sensor probed through a wireless link, although with .... phase: the local oscillator intrinsic noise as characterized by its phase ...
and local oscillators used in the detection of moving tar- gets in such ... -30°C to +70°C. However, for higher operating temperatures, please contact the factory.
If you're building your project from scratch and have the ... there are more options as some radios are two-piece systems, ... watts in a 28-volt electrical system).
Jun 26, 2009 - assembled unit is listed as MKU X2 1224 in the catalogue from DB6NT and intended for 11 to .... For setting to zero the AF control of the driver is used. .... with the two relays, only a minimum of single components is necessary.
frequency, a correction factor (in +dB) is shown on the label ... correction factor is added to the power meter reading to yield the value of true ... 1% duty cycle.
performance. ENR outputs of up to 35 dB allow detection of receiver decenoration and developing faults. In addition to the standard product line of system Noise ...
be done only with the help of a magnifying glass of at least 4 dioptres. .... HF-PCB ist üblicherweise mit 2-Komponenten-Silberleitkleber eingeklebt und wird bei ...
Chip '5 \ ~-._ to \ ~. - PHOVEN RELIABILITY h ,2 .0 at âs. a. . 2 \Lu. 'ii'; DESCRIPTION 3 9 new ~., .'I. I The NEBOUt AND NEeooz are medium power GaAs FETs.
This makes copying of weaker SSB signals quite difficult. The blame for this effect can be laid directly at the door of the crystal itself. I have been pursuing a cure ...
The downconverters have conversion losses ranging from. 6 dB in K-Band to 8 dB in ... A calibration curve is supplied that allows accurate absolute power ...
O Large Gate Cross Sectional Area for Rugged IST. -1.60 $ 0.08 DIA. 0.25 (0.01) ... equipment transients and Inductive pickup. Ground-. Ing of equipment and ...
Fujitsu recommends the following conditions for the reliable operation of GaAs modules: 1. The drain operating voltage (VoD) should not exceed 8 volts. 2.
1.0 WATT GaAs FET. MSC 88004 ... GaAs Field Effect Transistors employing the latest .... Dimensions in inches for 0.025 inch thick Alumina (A1,0) substrate.