Specifications

Transistors
Transistors will be installed in groups so that testing can be performed. After successful testing, the
next group will be added. Using this approach will ensure that the completed project works as
designed.
[ ] Install 2N3904 transistors at locations Q14 and Q15.
[ ] Install a 2N7000 transistor at location Q16. Note that 2N7000 transistors are sensitive to static, so
touch a metal object before picking up this type of transistor. Building over a cookie tin is suggested as
a means of providing the metal object, plus it keeps parts from falling off of the work bench.
[ ] Plug a speaker or headphones into J6. Apply power to J1 and confirm that a 700 Hz tone is coming
out of the speaker. Rotate trimmer resistor R32 through its full range and confirm that the audio level
changes from nothing to full volume. This is a test of the side tone oscillator and its mute switch.
[ ] Write down your results/observations_________________________________________________
_________________________________________________________________________________
[ ] Install 2N7000 transistors at locations Q11, Q12 and Q13.
[ ] Connect a test lead from the lower lead of R21 to ground. Place a jumper (diode lead saved from an
earlier step) from pin 20 to pin 16 on IC socket U1. Plug a speaker or headphones into J5 . Apply
power to J1 and confirm that a 700 Hz tone from the side tone oscillator is coming out of the speaker.
This is a test of the audio muting switch when using the side tone oscillator as an audio source.
[ ] Write down your results/observations_________________________________________________
_________________________________________________________________________________
[ ] Install 2N7000 transistors at locations Q1 and Q2.
[ ] Connect an antenna or other RF signal source to J3. Connect the antenna lead of a receiver to J2.
Apply power to J1 and confirm that band noise or signals from the signal source can be heard on the
receiver. This is a test of the series switches that connect the receiver to the antenna during receive.
[ ] Write down your results/observations_________________________________________________
_________________________________________________________________________________
[ ] Install 2N7000 transistors at locations Q3 and Q6. These are the shunt switch elements but won't be
tested until later system tests.
[ ] Install a 2N3906 transistor at location Q9.
[ ] Install 2N7000 transistors at locations Q7 and Q10.
[ ] Connect an antenna or other RF signal source to J4. Connect the antenna lead of a receiver to J3.
Apply power to J1 and confirm that band noise or signals from the signal source can be heard on the
receiver. This is a test of the PIN diode switch that connects the transmitter to the antenna when
transmitting.
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