Fréquencemètre low cost

Pour vos constructions ou pour un poste qui n'a pas d'affichage précis de la fréquence et ainsi lui donner un petit coup de "jeune"....

Disponible sur Aliexpress et d'autres sites.... par ex: Aliexpress  ou Ebay: EBAY(cliquez sur le lien)

Références : PLJ-6LED "afficheur 6 digits 0.1 Mhz a 65Mhz "

7 ou 8€ livraison comprise !!!!

Je m'en sers pour un poste mono-bande 40m et cela fonctionne très bien .









Paramétrage (en anglais) :

1.  Resolution
UPPER selects next menue: IF-setting
LOWER toggles resolution 10Hz / 100Hz; then select with UPPER key > back to measurement
2.  IF-setting
UPPER selects next menue: IF up/down
LOWER: To change IF setting it´s necessary to change 1st digit (toggle through back to “0”) 
even if you don´t want to change it. Then you can change with LOWER and store all digits
(each digit separately) as you want with UPPER.
After you changed all 6 digits with the last UPPER > back to measurement
3.  IF-sign
UPPER selects next menue: Light intensity
LOWER toggles IF-sign between “u” and “n”
u: subtracts set IF; e.g. if set to 455kHz and input is 10.455MHz then 10.000 is indicated
n: adds set IF; e.g. if set to 455kHz and input is 9.545MHz then 10.000 is indicated
Then select with UPPER key > back to measurement
4.  Light Intensity
UPPER: End of parameterization and back to measurement
LOWER toggles through 1 to 8 and increases intensity.
Then select with UPPER key > back to measurement
Setting of Sensitivity/Bias
The sensitivity (DC-Bias) can be set with a trimpot in the DC-feedback of the amplifier for 
optimum DC-bias:
Use a HF-signalgenerator with 50 to 60MHz and adjust trimpot when reducing input voltage
for best and stable readout.
Setting of Timebase/Frequency adjust
The timebase is a DSA535SA (look for datasheet in the www), the frequency can be changed 
by a tuning voltage.
Use a reference at 50 to 60MHz with 10Hz resolution and 100mVPP with a stable readout 
and adjust trimpot for exact frequency indication; give the unit some minutes to stabilize.
Ignore that the first digits are suppressed in this setting, only the last digits are relevant

Specifications
Supply: DC 8V-15V - 90mA(max)
High impedance input
Range: 0.1 MHz to 65 MHz (below 100kHz definitely no measurement!)

73' à tous