Differences

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--- guides:radio_modules:ntx2 [2013/06/12 18:00] – Added additional info and cleaned it up upu
+++ guides:radio_modules:ntx2 [2016/09/05 05:58] (current) – upu
@@ Line 1: / Line 1: @@
-===== NTX2 =====
+===== NTX2/NTX2B =====
 ==== Overview ====
-The Radiometrix NTX2 is the most popular radio transmitter module in use for UK HABing due to its simple operation and robust construction. It is available in 434.075Mhz and 434.650MHz variants.
+The Radiometrix NTX2/NTX2B is the most popular radio transmitter module in use for UK HABing due to its simple operation and robust construction. The original version was available in 434.075Mhz and 434.650MHz variants. The newer NTX2B is more stabled fitted with a TCXO but Uputronics [[https://store.uputronics.com/index.php?route=product/product&product_id=60&search=ntx2|sell a modified, frequency agile version]].
 ==== Details ====
-Default output of the module is 10mW (Radiometrix do a 25mW HP version). Current draw is 20mA when transmitting and 0.6mA in standby. The input voltage to frequency characteristics of the NTX2 are reasonably linear at around 1.9kHz/V about the 1.5V input centre point - see graph below. The graph shows frequency offset (kHz) against data input voltage over the 0 - 3V range.
+Default output of the module is 10mW (Radiometrix do a 25mW HP version). Current draw is 20mA when transmitting and 0.6mA in standby. The input voltage to frequency characteristics of the NTX2/NTX2B are reasonably linear at around 1.9kHz/V about the 1.5V input centre point - see graph below. The graph shows frequency offset (kHz) against data input voltage over the 0 - 3V range.
 {{guides:ntx2.jpg|}}
-NTX2 modules can be powered directly from the batteries having their own internal 2.7V regulator. The manufacturers datasheet is here [[http://www.radiometrix.com/content/ntx2|NTX2 Datasheet]]
+NTX2 modules can be powered directly from the batteries having its own internal 2.7V regulator. The manufacturers datasheet is here [[http://www.radiometrix.com/content/ntx2|NTX2 Datasheet]]
 ==== Legislative ====
@@ Line 21: / Line 21: @@
 ==== Frequency Stability ====
-The NTX2 temperature stability isn't great - in addition to drift the frequency shift tightens up with decreasing temperature.
+The original NTX2 temperature stability isn't great - in addition to drift the frequency shift tightens up with decreasing temperature. Adequate insulation is recommended, ensuring the module isn't exposed to rapid temperature changes is essential. The newer NTX2B with its TCXO is much more stable.
 ==== NTX2 Adjustments ====
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 The lower adjustment screw seems to be a pot adjusting the [[http://en.wikipedia.org/wiki/Frequency_deviation|deviation]]. With the voltage driven FSK implementation we use, this conveniently allows for fine tuning the shift.
-==== Where to buy the NTX2 ====
+==== Where to buy the NTX2B ====
-  *[[http://ava.upuaut.net/store/index.php?route=product/category&path=71_63|HAB Supplies stock the NTX2]]
+  *[[https://store.uputronics.com/index.php?route=product/product&product_id=60&search=ntx2|Uputronics sell a frequency agile version of the NTX2B]]
-  *[[http://uk.farnell.com/radiometrix/ntx2-434-650-10/transmitter-434-65mhz-10mw/dp/1348829|Farnell(UK)]] - expensive
+  *[[http://radiometrixstore.com/ntx2b.html|Radiometrix Online Store]] - Only available in 434.075 and 434.650
-  *[[http://http://radiometrixstore.com/|Radiometrix Directly]]
 ==== Other Notes & Further Reading ====