Because the NO4 transceiver of the previous work used 9MHZ filter that is sold for filter the circuit was complicated.This NO5 transceiver is using 15MHZ ladder type filter that I myself made. Because of this the circuit was simplified more largely in comparison with the previous work.
This NO5 transceiver is liking it most most, in the transceiver that I made with the self. This transceiver was completed in September, 1993.
Front operation panel arrangement
( Arrangement situation of the operation knob )
The photograph is the one that shot the NO5 transceiver the front. The left meter is a signal meter. The upper part of the middle the digitaldisplay of frequency. The knob under the left is the volume for AF output adjustment.The knob of the lower right is for the frequency adjustment of below 1KHZ ( + - 500HZ variable ). When this knob is pulled in the front furthermore the antenna line is connected to the input of a direct SSB generator and can receive the standard radio wave of 15MHZ.
The big knob of the right side is the dial for the frequency transformation of a main. As for this dial the frequency change of 1KHZ is produced with 1 step.
The size of the case is 5 cm (height), 15 cm (width), 20 cm (length). This case is sold as the merchandise. The product name is the name called FM-50.
Arrangement of the aluminum board upper side
I am making it with the sandwich structure, to make the transceiver as small as possible.
I am putting in such an aluminum plate that divides the top and bottom into the case. The aluminum plate of I am attaching the parts up and down.I am attaching the SSB generator, transverter, power amplifier in the upper side of the board. Also I am attaching the PLL circuit and updown counter circuit to the lower side of the board.
The photograph of the top is the one that shot the upper side of the partition board. The left top is a SSB generator. Filter is combining with the ladder type by using eight piece of crystal of 15MHZ.
The board of the transverter circuit that converts 15MHZ to 21MHZ is arranging it on the right. Needless to say this part is a sending and receiving combined use.
Final power amplifier circuit board is being arranged to the lower part. The transistor of the final step has obtained biggest output 3W, by using 2SC1957.
Arrangement of the aluminum board lower part
The photograph of the top is the one that shot the part arrangement of the lower part of the aluminum board.
The right top is a PLL oscillation circuit. And the under is a dial encoder circuit. The under the left is the updown circuit that controls the PLL circuit.The 60MHZ unit (10KHZ step) oscillated in the PLL circuit and do the division in 1/10 with the division integrated circuit and make the 6MHZ unit (1KHZ step). Mixing this 6MHZ and IF(15MHZ) , I have obtained 21MHZ.
The frequency that is able to transform it is 899KHZ of 21.899MHZ from 21.000MHZ. Of below 1KHZ the frequency adjustment has materialized crystal 10.240MHZ of the PLL circuit by doing VXO.
The NO5 transceiver that I introduced here is each characteristic like the following. I asked to measure to Kikuchi OM (JA1HWO) about each characteristic other than the current of the sending and receiving.
| * Current of reception | 225mA | |
| * Peak current of the transmission | 795mA | |
| * 2nd output harmony | -52dB | |
| * 3rd output harmony | -60dB following | |
| * Career Suppression | -48dB | |
| * sprias(VFO*3) | -66dB | |
| * Transmission output power | 3W | |
| * 15MHZ Filter characteristic | -6dB BW 2.2KHZ -60dB BW 4.1KHZ |
* As for these value the power supply voltage
is 13.0V.
I prepared more detailed data here. It is an expansion photograph and block diagram, circuit figure etc.
Contact video using NO5...Challenge the contest with No.5 machine
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