Differences

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--- radios:dr-m06th [2026/02/13 23:09] – g5rkt
+++ radios:dr-m06th [2026/02/13 23:17] (current) – [Modifying an Alinco DR-M06TH 6m transciever for packet usage] g5rkt
@@ Line 8: / Line 8: @@
 After tapping the discriminator & modulator the radio was bench tested using an 857D and a pair of NinoTNCs; it works on 4k8 IL2Pc beautifully. The main issue with testing was those Aerial Facilities dummy loads are **superb** at 50MHz!
-Ticking away happily as GB7WIN's 6m port! Live long and prosper little Alinco (April '25).
+Ticking away happily as GB7WIN's 6m port! Live long and prosper little Alinco!
+Mods:
+- Inputs for TX audio, pre/deemphasis and direct modulator inputs\\
+- Ouptuts for RX audio, pre and post filter\\
+- 6 pin mini-DIN connector on the rear\\
+- Selectable "1200/9600" audio output\\
+- 2nd IF filter replacement (6KHz -> 3KHz)\\
+- Second receiver SDR tap\\
 =====Schematic detail=====
@@ Line 60: / Line 69: @@
 =====Filter replacement=====
-The radio is set up to receive +-5KHz FM voice, but on packet we're using +-2.5KHz FM voice. I replaced the second IF filter (CFW455F, -6dB BW +-6KHz, -40dB BW +-12.5KHz) with a tighter filter (CFW455H, -6dB BW +-3KHz, -40dB BW +-9KHz).
+The radio is set up to receive +-5KHz FM voice, but on packet we're using +-2.5KHz deviation. I replaced the second IF filter (CFW455F, -6dB BW +-6KHz, -40dB BW +-12.5KHz) with a tighter filter (CFW455H, -6dB BW +-3KHz, -40dB BW +-9KHz).
 =====SDR Tap=====
 To give us a bit more information about what is happening on site I opted to fit an SDR tap to the radio and feed it into an RTL-SDR Blog v4. Initial experiments show that with an S9 signal into the receiver and 45dB gain set on the RTL a -30dBm signal is reported by the SDR, and in full power transmit a -10dBm signal is reported; well within the maximum input power of the RTL dongle.
+The SDR tap board employed was the PATV type with no LPF as this board is being fed directly from the input LPF in the radio.
 {{:radios:dr-m06th:dr-m06th-sdrschematic.jpg?960|}}\\