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@@ -24,11 +24,11 @@ This software uses <a href="http://www.alsa-project.org">Alsa</a> kernel driver
<p>
Use a radio transmitter for 2-meter band to transmit to A-Netz or B-Netz phones.
Use a radio transmitter for 70-cm band to transmit to C-Netz or NMT phones.
-An amateur radio can be used, but be sure it is not limited to amateur radio frequencies and channel rasters.
-For A-Netz the transmitter must be able to transmit arround 162 MHz.
-For B-Netz the transmitter must be able to transmit arround 153 MHz.
-For C-Netz the transmitter must be able to transmit arround 465 MHz.
-For NMT the transmitter must be able to transmit arround 463 MHz.
+An amateur radio can be used, but be sure it is not limited to amateur radio frequencies and channel spacing.
+For A-Netz the transmitter must be able to transmit around 162 MHz.
+For B-Netz the transmitter must be able to transmit around 153 MHz.
+For C-Netz the transmitter must be able to transmit around 465 MHz.
+For NMT the transmitter must be able to transmit around 463 MHz.
</p>
<p>
@@ -39,8 +39,8 @@ This image shows a two-band amateur radio receiver without limitations for the f
<p>
I built several transmitters out of modified taxi radios.
-It features a simple digital PLL (configurable by junpers) and allows to directly connect the audio signal to the oscillator.
-This is highly recommended for the C-Netz, because signalling is done by sifting the carrier directly.
+It features a simple digital PLL (configurable by jumpers) and allows to directly connect the audio signal to the oscillator.
+This is highly recommended for the C-Netz, because signaling is done by sifting the carrier directly.
One unit has a switch to change between A-Netz and B-Netz (2-meter version) and the other units to change between C-Netz and NMT (70-cm version).
I added an input to switch between two channels for the B-Netz.
(Whenever a B-Netz phone is paged, the channel must be temporarily switched to the paging channel.)
@@ -51,13 +51,13 @@ I added an input to switch between two channels for the B-Netz.
<p>
Use radio receiver for 2-meter band to receive from A-Netz or B-Netz phones.
Use radio receiver for 70-cm band to receive from C-Netz or NMT phones.
-The transmitter cannot be re-usedr, because all networks are full duplex.
-A seperate radio is required to simultaniously transmit and receive.
-For A-Netz the receiver must be able to receive arround 162 MHz and 157 MHz.
-For B-Netz the receiver must be able to receive arround 153 MHz and 148 MHz.
-For C-Netz the receiver must be able to receive arround 465 MHz and 455 MHz.
-For NMT the receiver must be able to receive arround 463 MHz and 453 MHz.
-The receiver must support both uplink and downlink frequencies, to make a test loop for the calibration process.
+The transmitter cannot be re-used, because all networks are full duplex.
+A separate radio is required to simultaneously transmit and receive.
+For A-Netz the receiver must be able to receive around 162 MHz and 157 MHz.
+For B-Netz the receiver must be able to receive around 153 MHz and 148 MHz.
+For C-Netz the receiver must be able to receive around 465 MHz and 455 MHz.
+For NMT the receiver must be able to receive around 463 MHz and 453 MHz.
+The receiver must support both up-link and down-link frequencies, to make a test loop for the calibration process.
</p>
<p>
@@ -71,7 +71,7 @@ This image shows a two-band amateur radio receiver that supports all the frequen
The best solution I could find for low price is the Uniden UBC360CLT.
It is actually some kind of clock radio with scanner.
It supports all relevant bands up to about 950 MHz.
-In all bands the channel raster is freely selectable.
+In all bands the channel spacing is freely selectable.
Up to 300 channels can be stored and simply selected by using up/down keys.
</p>
@@ -79,14 +79,14 @@ Up to 300 channels can be stored and simply selected by using up/down keys.
<p>
I added a discriminator output to the radio, to get undistorted receive signal.
-This is highly recommended for the C-Netz, because signalling is done by sifting the carrier directly.
+This is highly recommended for the C-Netz, because signaling is done by sifting the carrier directly.
</p>
<center><img src="discriminator.jpg"/></center>
<p>
In order to keep RF emission low, use a dummy load for lab test.
-Use two seperated antennas for outside use of the mobile phone.
+Use two separated antennas for outside use of the mobile phone.
Connect one dummy load to the transmitter and another one to the mobile phone's antenna connector.
</p>
@@ -99,11 +99,11 @@ My phone did not work correctly with a 5 Ampere 12 Volts regulated power supply.
I suggest to use an amateur radio power supply with low ripple.
In my case I use modified ATX-2 power supply for 12 or 13.8 Volts.
The voltage can be adjusted in most power supplies, but 12 Volts is good enough.
-These power supplies have built-in overcurrent/overvoltage protection.
+These power supplies have built-in over-current/over-voltage protection.
The ATX-2 power supplies are regulated on the 12 Volts rail.
I added two plugs and a switch.
The switch connects to the PS-On line.
-In case of an overcurrent, the switch can be used to reset the protection circuit.
+In case of an over-current, the switch can be used to reset the protection circuit.
Note that opening a switching power supply can be dangerous and may cause death.
If you don't have the knowledge about power supplies, ask an expert to help you.
</p>
@@ -111,18 +111,18 @@ If you don't have the knowledge about power supplies, ask an expert to help you.
<center><img src="power.jpg"/></center>
<p>
-Early tests were done without any wireing between radios and sound adapter.
+Early tests were done without any wiring between radios and sound adapter.
This may worked for early tests with the B-Netz, but turned out to be a pain in the as.
-It is not possible to keep the levels and avoid feedbacks.
+It is not possible to keep the levels and avoid feed-backs.
</p>
<center><img src="headphone.jpg"/><img src="microphone.jpg"/></center>
<p>
The sound adapter must be connected to a transmitter and a receiver.
-Coils are suggested for galvanic seperation.
+Coils are suggested for galvanic separation.
I don't use coils, instead I add extra grounding wire between earth (power supply) and sound interface.
-For adjustemnt I highly recommend to use variable resistors.
+For adjustmnt I highly recommend to use variable resistors.
This makes the adjustment process faster.
I use 4.7 K resistor for connecting headphone output to radio input.
I use 10 K resistor for connecting radio output (discriminator) to microphone input.