Hi again bogdan2014.
EXAMPLES OF SYMBOLS FOR NEW COMPONENTS
* Use the attached circuit. HAM-Radio VHF – YAESU – FT-2900R
1. Dual Gate MOSFET Transistor - SMD.
See in the attached circuit the Dual Gate MOSFET Transistor Q1045 = 3SK296ZQ.
The “S” pin is marked.
The “D” pin is the top one. It's not marked.
The “G1” pin is where the R1209(47K) // D1023 diode is connected. It's not marked.
The “G2” pin is where the R1178 (100K) is connected. It's not marked.
* Note that the drawing “Does not identify” the terminals of G1 and G2.
The G1 is where the RF signal comes in, coming from the antenna.
The G2 serves as an amplification gain control for the Q1045. Known as the AGC circuit.
* TIP: ALWAYS make the bottom pin of the Gate inputs “G1”, and the top pin, “G2”.
* The TR 3SK296ZQ's footprint is what we're calling “generic”... What are you doing. Follow the datasheet.
* I insist, in order to make a Perfect Symbol, that you indicate in your Symbol the terminals “D,S,G1,G2”, so that the designer user “does not make a mistake when connecting the pins”... And also, that in the drawing of the Symbol, G1 is at the bottom of the drawing and G2 is at the top. Just as it is in the Q1045 circuit. And in the footprint the connections are according to the datasheet.
* In this way, the RF signal will ALWAYS enter the lower terminal of the Transistor (G1) and the AGC in the upper terminal (G2)... This is what happens in all radio communication circuits. Like YAESU, ICOM, KENWOOD, ALINCO... This is a standard of radio communication projects.
2 Ceramic Discriminator
In this circuit, it is component CD10001 = JTBM450CX7.
* This Symbol used is not a consensus among radio manufacturers... But I think it's very good. You can adopt him if you want.
* This CD10001 = JTBM450CX7 is an SMD version, center frequency at 450KHz. And the footprint is the same as:
SMD: CDBC455C16 (MURATA), JTC Series (TOKEN)
3 Ceramic Filters for Communications
In this circuit, it is the components CF1001 = LTM450GW and CF1002 = LTM450FW.
* Circuit designer did not show all Cerami Filter connections.
* In practice, the footprint can be of two types PTH and SMD, as I said:
PTH: LTM455EW (TOKEN), LTM455EU (TOKEN)
SMD: LTC455EU (TOKEN), LTC455EW (TOKEN)
* The letter of the part number informs the Ceramic Filter's “Band Through”: A, B, W, C, D, E F, G, H, I, HT...
4 IC FM/AM Detector
In the case of the circuit, IC Q1028 = NJM2591V is equal to TA31136 = AA32416.
5. CRYSTAL FILTER for Communications
In this circuit, it is the components XF1001 = 21R15A and CF1002 = 21R15A.
* If you google it, you will see that the 21R15A model is for the 21.4MHz center frequency. E It is not for the frequency of 21.7MHz, as it is written in the circuit.
* But the first intermediate frequency (IF) in the device is f = 21.7MHz... Maybe the designer misspelled it, and the original component has another code.
* This type of CRYSTAL FILTER or Xtal Filter is also widely used in communication signal reception circuits.
* They exist as a PTH component, and as an SMD component. As nowadays, most of the plates of these radios are made by insertion in an automatic machine. They usually use the SMD version.
* CRYSTAL FILTER for Communications doesn't seem to have it in KICAD 6.0.4.... I think it's interesting to add it to your list.
* I will look for more datasheet information and let you know.
* Attached are the datasheets.
All the best