Thursday, December 10, 2015

ITR40-20

I said lets do something different, a basic level thing. We have commercial rigs, we have some homebrew rigs and some homebrew rigs are as par with commercial rigs.

But there is a gap between something called pixie to R7 Dayton receiver. Even simple than a dc receiver, which a novice or a new entrant in ham radio can build without any problem and experience some RF and learn to use cw-tx , cw-rx , antenna, etc  But there is a penalty to simplicity. Only a single frequency. You are tied to a single freq, I have a dream to make a small portable full working airworthy cw transceiver using xtal. Similar to MUZO.

I am making two receivers using cheap and easily found 3.579mhz, 7.159mhz, 14.318mhz xtals for band 40meter and 20 meter.

cw tx using 7.159mhz for 40 meter and 14.318mhz for 20 meter. I have made a pcb pattern. No hole. You place the components on pcb and its done.

have a look






Parts list

ITR40-ITR20

Sr No
Item No.
Value
Note
1
Q1
BC549C


2
R1
2K2


3
R2
1K


4
R3
220


5
R4
100


6
R5
10


7
R6
10


8
C1
0.1


9
C2
0.1


10
C3
100,25V


11
C4
33P


12
C5
33P


13
C6
33P


14
Q2
BF494


15
Q3
BC549C


16
R7
10K


17
R8
47K


18
R9
470


19
R10
4K7


20
R11
10


21
C8
0.1


22
R15
470


23
R20
470 Preset


24
D1
1N4148


25
D2
1N4148


26
C13
100p


27
Q4
BC547


28
R12
100K


29
R13
2K2


30
R14
100


31
C9
100p


32
C10
100p


33
C11
33p


34
C12
0.1


35
Q5




36
R16
2K2


37
C14
0.1


38
C15
10, 25


39
C16
100p


40
R17
1M


41
R18
4K7


42
C17
10,25


43
R19
10




That's it folks.

1 comment:

  1. Nice efforts Inderjit......but you can attain frequency agility with a ceramic resonator vxo. And simplicity and minimalism is synonymous with qrp. Keep simple and no nonsense homebrewing alive.......I have been doing that since 1982 now I have incepted a blog too.......

    ReplyDelete