Electronics > RF, Microwave, Ham Radio

Need info about this FM transmitter (1 of 2)

(1/1)

Merlysys:
I want an FM transmitter to do some experiments with (using load)
http://www.ebay.ca/itm/222099498416

Specs are given as
  - Output power: 3 DBM - 15 DBM
  - Working frequency: 85 MHZ--115 MHZ

Is this really an FM transmitter? If so what would the max power output be? Is it possible to convert dbm to watts?

xrunner:

--- Quote from: Merlysys on May 03, 2016, 06:24:16 pm ---Is this really an FM transmitter?

--- End quote ---

Well, that's what they claim. Buy one and see.  :-//


--- Quote ---If so what would the max power output be? Is it possible to convert dbm to watts?

--- End quote ---

dBm is power relative to 1.0 mW. 0.0 dBm is 1.0 mW of power, so (+) 3 dBm would be twice that or 2.0 mW. (+) 15.0 dBm is 31.6 mW output power.

Ammar:
It very much could be. I assume those SOT-23 packages are discrete transistors. I don't know why they have bothered when there are many integrated solutions. Looks like a cheapy. Expect the frequency to drift if you do get it.

mos6502:
It's just your standard 3 transistor FM bug. Dozens of circuits out there. Transistors used:

J6 - probably MMS9014
J8 - MMS9018

Navigation

[0] Message Index