1. The PHILCO Phorum
  2. Various and Sundry Categories
  3. Test Equipment
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Linear Mode
Chinese frequency counter module
Phlogiston
Radio-Fixer-Upper
*****
Posts: 2,118
Threads: 112
Joined: Jun 2010
City: Medford OR (OR what?)
#12

02-09-2017, 03:07 PM
(02-09-2017, 10:50 AM)JaseSerre Wrote:  Hi..i am a new user here. As per my knowledge the counter has a MOSFET front end and a pair of back to back protection diodes from input to ground, so if the signal is more than 0.7 v peak the diodes will conduct and load the measured circuit. Better to add a series resistor to reduce signal if it is at high level as in a tube osc circuit.

I have found that I can overdrive it and attenuate the signal to the point that it can not be read. Also putting more than ~ 20% modulation on the signal will cause the reading to jump around about 5k.
"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/
Website Find
« Next Oldest | Next Newest »


Messages In This Thread
Chinese frequency counter module - by Mondial - 12-01-2016, 04:42 PM
RE: Chinese frequency counter module - by Mondial - 12-01-2016, 09:09 PM
RE: Chinese frequency counter module - by Mondial - 12-02-2016, 08:27 AM
RE: Chinese frequency counter module - by Mondial - 12-20-2016, 08:38 PM
RE: Chinese frequency counter module - by Phlogiston - 02-09-2017, 03:07 PM
RE: Chinese frequency counter module - by Mondial - 02-09-2017, 03:40 PM
RE: Chinese frequency counter module - by Arran - 04-02-2017, 03:17 AM
RE: Chinese frequency counter module - by Mondial - 04-12-2017, 12:01 PM
RE: Chinese frequency counter module - by morzh - 11-30-2017, 02:54 PM
RE: Chinese frequency counter module - by govee - 01-25-2021, 03:03 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Cannot Adjust an IF Transformer’s cores
The abilities of our 'Phorum Pholks" never ceases to amaze me! Fantastic fabrication, Joseph! I'm waiting now for...GarySP — 08:27 PM
PT-6 antenna connections
Thanks. I never realized that was a notch noted in the schematic as described. I’ll recheck my wiring.bridkarl — 08:13 PM
Cannot Adjust an IF Transformer’s cores
Thank you! I was quite new to the Phorum when I started this post, so I feel like it might be advantageous to publish a ...jrblasde — 08:07 PM
PT-6 antenna connections
Notice in the schematic the notch at the bottom of the antenna coil is between pins 3 & 4. Yes, pin 6 of the 7C6 is...RodB — 07:34 PM
bridkarl
I have two PT-6 chassis. On both there is a blue wire that runs from the above chassis transformer to pin 6 of 7C6. So t...bridkarl — 07:23 PM
Cannot Adjust an IF Transformer’s cores
Joseph, now you are an engineer!!RodB — 06:37 PM
PT-6 antenna connections
Hi, reading your explanation I can see the confusion. If you take it one connection at a time it should result in a desi...RodB — 06:34 PM
Cannot Adjust an IF Transformer’s cores
It works! I received the PCBs this morning in the mail, and put everything together. I reused the base from the original...jrblasde — 04:32 PM
PT-6 antenna connections
I seem to have lost my way on this PT-6. I see the antenna aerial transformer schematic - I’m reading pins 1 through ...bridkarl — 12:30 PM
40-150 General questions
Good thing you're a good electrician ... the pictures show a lot of rewiring in your future! Take care and BE HEALTHY!...GarySP — 11:52 AM

[-]
Who's Online
There are currently 4205 online users. [Complete List]
» 1 Member(s) | 4204 Guest(s)
Avatar

>
  1. The PHILCO Phorum
  2. Various and Sundry Categories
  3. Test Equipment