Vref Circuit added to provide 1 e -11 tuning resolution with +/- 5 V tuning on VE2ZAZ Controller. It also attenuates and offsets the +/- 5V control voltage to the 0 to +5V range required by the MV89A. The 10K pot allows centering the OCXO at exactly 10 MHz with 0V at the V1 input. This decreases the control voltage dependance on supply variations in the GPS controller.
VE2ZAZ GPS CONTROLLER VCXO CONTROL VOLTAGE
MiniCircuits Power Splitter 1: 8
+12 dBm
10 MHz Input
MV89A MEASUREMENTS Vc
Freq * 200 0 -1769.3 2.484 -1021.2 5.02 -292.4
OCXO alone SLOPE Hz / V 1.471
Freq (Hz) ref. @ 10 MHz -3.8465 -0.106 3.538
mV into 1K 42.70 Vc to GND 43.40
Vc to +5V ref
OCXO Average Zin
Zin at Vc in 57173 57433 57303
MV89A Freq vs Vc 4 3 2 Freq Hz
1 0 -1 -2 -3 -4 -5 0
1
2
3
4
5
6
Vc Volts
Circuit added to provide 1 e -11 tuning resolution with +/- 5 V tuning on VE2ZAZ Controller
sma
V1 -5 to +5V
MV89A
Vc Scaling adjust
10K
750
10 MHz +7.3 dBm
OCXO
1K
10K 20K
250
10K 10 MHz set @ V1 = 0
Vref
With V1 = 0 The 10K pot gives: Vc min / max = 2.115 / 3.021 V Delta V = 0.906V or 1.333 Hz frequency adustment range. With 10K pot at middle and with V1 min / max = -4.5 / +4.5 V, we get: Vc min / max = 2.054 / 3.074 V Delta V = 1.02 V or 1.5 Hz frequency adustment range. VE2ZAZ's controller has 14 bits resolution or 16384 levels. Then the corresponding freq resolution = 1.5 Hz / 16384 = 91.5 uHz. At 10 MHz, this is 9.15 e -12 resolution, or approx. 1e-11 resolution.
QB-188
+16 V IN
OUT
MATCHING CKT
GND
+12 V REG
PI Filter PCB
ZFSC- 8-1
IN
Vctrl
MV89A OCXO 10 MHz Adj
Cabinet: Hammond 1455T1601
X 2.529
PI Filter PCB
L2 C5
C4 L1
SIDE VIEW 1.85
TOP VIEW
Cabinet
2.0 100 1.5
0.45
125 125
1.6
RF
GND
OCXO 2.2
MV89A R1
OCXO
1.7
Vref
MV89A
Components
spacer
C1
2.9 0.4
Vc
+12V
PCB PI Filter
R2 R3
A Z X
10 MHz OCXO
POWER
1.28 2.555
0.500 in
6.5 po.
2 po. 50
202
120 39 washer 93 702
POWER
OCXO & CLOCK DISTRIBUTION
A Z X
OUTPUTS 10 MHz + 12 dBm
POWER
OCXO & CLOCK DISTRIBUTION
A Z X
OUTPUTS 10 MHz + 12 dBm
ISOLATION OUT 1 TO OUT 2
ISOLATION OUT 1 TO OUT 4
ISOLATION OUT 1 TO OUT 8
S11 AT HI-PASS MATCHING OUTPUT
S11 AT HI-PASS MATCHING OUTPUT
Sine Output at Splitter OUT
MV89A OCXO sma
V1 -5 to +5V
10 MHz +7.3 dBm
Vref
Vc Scaling adjust
10K
750
1K
10K 20K
250
10K 10 MHz set @ V1 = 0
Scaling and Frequency Adjust Circuit
MV89A Homemade PCB
MV89A
8 to 1 Splitter
Matching
Supply Filter
Amplifier
Completed System
As Used with VE2ZAZ Controller
Rear View Without Controller, Vc IN is shorted
OUTDOOR GPS ANTENNA
PVC Pipe 1 ¼ in.
3 in Pipe CAP Note added short length of pipe inside PVC Adapter 3 in. to 1 ½ in. Galvanized Steel Plate To hold the GPS Antenna PVC Adapter 1 ½ in to 1 ¼ in.
Bulkhead Feedthru SMA to N
Bulkheag Feedthru SMA to N Mounted on PVC Adapter 1 ½ in to 1 ¼ in.
PVC Adapter 3 in. to 1 ½ in. and SMA to N Bulkhead Feedthru
GPS Antenna with a short length Of RG-174 Mounts on top of PVC Adapter 3 in. to 1 ½ in. Completed Antenna attached to the Roof Side
2002 IEEE International Frequency Control Symposium and PDA Exhibition
A NEW HIGH STABILITY DOCXO. STATISTICS OF THE RESULTS OF FREQUENCY STABILITY MEASUREMENTS. By S.V.Anastasiev, A.A.Volkov, Y.L.Vorokhovsky, Morion, Inc, Phone: 7812-350-9565; Fax: 7-812-350-7290; St.Petersburg, Russia
SUMMARY Recently the significant increase of demand for Ultra Stable Quartz Oscillators has been evidenced. Such oscillators are used for many applications including CDMA, GPS/GLONASS, etc. The following major requirements are usually applied for these oscillators: frequency stability vs. Temperature changes of+/(1..2)*10-10; long term stability of+/-(1..2)*10-8/year; short term stability of
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