Measurements on muRata VCO modules
MuRata is a Japanese company with a broad line of radio frequency
products. Their VCO modules can often be found as surplus or be
recovered from various cellphone equipment. Unfortunately muRata is not
good at providing datasheets on the web. The table below shows the
results of some measurements that should give a hint of what one can
expect from these modules.
MQE001-877
|
|
|
|
f (MHz)
|
858
|
909
|
966
|
P (dBm)
|
8
|
8
|
9
|
Utune (V)
|
0.7*
|
5.1
|
12
|
|
|
|
|
MQE001-1003
|
|
|
|
| f (MHz) |
975
|
1048
|
1128
|
P (dBm)
|
3
|
2
|
1**
|
Utune (V)
|
0
|
5.9
|
12
|
|
|
|
|
MQE504-964
|
|
|
|
f (MHz)
|
925
|
1006
|
1092
|
P (dBm)
|
3
|
2
|
-2
|
Utune (V)
|
0
|
4.2
|
12
|
|
|
|
|
MQG101-2145
|
|
|
|
f (MHz)
|
2058
|
2258
|
|
P (dBm)
|
n/a
|
n/a
|
|
Utune (V)
|
0
|
5.5
|
|
* zero voltage produced heavy spurs
** bad phase-noise
A not to hasty conclusion is that the second number in the type code
indicates the center frequency. A tuning voltage of something like 0.5
to 5V seems to be a good choice.
The circuit used:
The module is oriented is such a way that the marking is seen from
above.
Different modules have different size and case styles. Some have many
pins not connected (internally grounded?) between those used above.
Other have large ground pads. Ground is always connected to the case.
With a 7808 no significant increase in output power could be measured.
12/8 -05
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