Low Cost Multifunctional Frequency Counter

[SM3ORA]

Hello!
I am going to build low-cost multifunctional seven digit LCD frequency counter, MAG.
I wonder if anyone can tell the true value of R2 in the circuit diagram?
Is it to be 47R or 47k? It is now 47E.

Sincerely, Lars

[vu3cns]

it is 47 Ohm

[SM3ORA]

Thanks for the reply.
I also wonder about the capacitor value.
Where it says ".1 MF," is it means 100nF?

Lars

[vu3cns]

Where it says ".1 MF," is it means 100nF?

Yes. It stands for microfarad (1 uF = 1000nF).
73's
CNS

[SM3ORA]

Thanks for the reply.
I want to use it to an IF 11.275MHz.
I am now not so good at programming, so ware in the software should you go in and change the value?

Lars

[vu3suy]

Where is the MAG Frequency counter download?

[vu3cns]

Hi,
The original hex file is listed in the downloads with the same name, i.e PIC Frequency counter - LCD Display. Another versions links are in the article itself.
http://www.hamradio.in/circuits/freq_counter_lcd.php
73's
CNS

[vu3suy]

Thanks for the reply.

[Oshborne]

Hello ...
I have a question for L2 = 1mh
whether there were similarities to component ..??
I did not find my place components ....

thanks before ...

[mvs sarma]

Welcome to Hamradio

L2 , 1mH inductor is Just for 12V line filter. If you don't have one, byepass or put a 1 ohm 1/4 watt resistor in its place.
All the best.

[Oshborne]

thanks for your reply Mr mvs sarma...
ok i will try it ...

[Oshborne]

sorry forgot one more question ....
suppose I want to put on my old CB radio freq 27MHz if I could ...???
how do I ...??

BR
Oshborne

[mvs sarma]

Perhaps you need to feed the LO to the counter and try to know and set the offset so that the dispay would be correct frequency as on antenna.

[Oshborne]

sorry, i ask again ..
I've managed to make the FC ...
but, I am confused as to its offset setting ....
for example I want to set for 11mhz frequency ....
how do I ...???
BTW: to swicth IF - VFO where I put it, in the scheme only connection to GND ....
so that I can place just switch VFO-IF, VFO + IF, IF NOR-REV & Select

Sorry If Bad my english...
Thanks Be4

[mvs sarma]

This element has been described in the article clearly, I suppose.


RB0/INT takes care of IF select it is a momentary action switch.

RB1 and RB2 make a selection for offset. As such we get 4 combinations.
RB1 RB2 definition SW position
0 0 Not used. Not possible
0 1 VFO+IF 1 to 2
1 0 VFO-IF 1 to4
1 1 IF-VFO 1 to 3 (not connected to either)

RB3 if switch is open (high) It could be Reverse.
And if closed (low) it would Normal.
As I understand , this is needed to cancel the –ve symbols the design cant display negative values.

regarding 11MHz IF management,\
i shall come back shortly. but as of now you get 10.7 and 10.245 also. there are spare locations where 10MHz is repeated. hence it could be possible to crate 11MHz IF. I remember that VU3CNS had once detailed on this. Mean time please check for one such post by him.