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radios:dr-m06th

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radios:dr-m06th [2026/02/13 23:16] – [Filter replacement] g5rktradios:dr-m06th [2026/08/07 20:58] (current) – Mort upgrade: tighten emphasis markers so they parse again 0.0.0.0
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 Mods: Mods:
-- Inputs for TX audio, pre/deemphasis and direct modulator inputs +- Inputs for TX audio, pre/deemphasis and direct modulator inputs\\ 
-- Ouptuts for RX audio, pre and post filter +- Ouptuts for RX audio, pre and post filter\\ 
-- 6 pin mini-DIN connector on the rear +- 6 pin mini-DIN connector on the rear\\ 
-- Selectable "1200/9600" audio output +- Selectable "1200/9600" audio output\\ 
-- 2nd IF filter replacement (6KHz -> 3KHz) +- 2nd IF filter replacement (+-6KHz -> +-4KHz or +-3KHz)\\ 
-- Second receiver SDR tap+- Second receiver SDR tap\\
  
  
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 {{:radios:dr-m06th:dr-m06th-pamodule.jpg?nolink&960|}}\\ {{:radios:dr-m06th:dr-m06th-pamodule.jpg?nolink&960|}}\\
-** Detail of PA module **+**Detail of PA module**
  
 These radios (I've got two) don't have any thermal compound between the PA and heatsink so I liberally applied that horrid white Servisol paste to the PA and linear regulators. After holding the radio in transmit for a few minutes at full power the heatsink becomes appreciably warm, but not remotely hot - and the PA module is the same temperature so good thermal contact was achieved. After dialling back the RF power from 22W to 10W and leaving it in transmit for 10 minutes the heatsink had reached equilibrium and was ~40C with no forced airflow. At 10W the radio drew 1.6A at 12.2V, so that's ~10W thermal into the heatsink which it certainly appears appropriately sized for. These radios (I've got two) don't have any thermal compound between the PA and heatsink so I liberally applied that horrid white Servisol paste to the PA and linear regulators. After holding the radio in transmit for a few minutes at full power the heatsink becomes appreciably warm, but not remotely hot - and the PA module is the same temperature so good thermal contact was achieved. After dialling back the RF power from 22W to 10W and leaving it in transmit for 10 minutes the heatsink had reached equilibrium and was ~40C with no forced airflow. At 10W the radio drew 1.6A at 12.2V, so that's ~10W thermal into the heatsink which it certainly appears appropriately sized for.
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 =====Filter replacement===== =====Filter replacement=====
-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).+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 (CFW455G, -6dB BW +-4.5KHz, -40dB BW +-10KHz). Based on the radio's S meter it's made a vast improvement, and decodes from BDH and RDG are solid! I have an even tighter one which I may chuck in down the road (CFW455H, -6dB BW +-3KHz, -40dB BW +-9KHz), perhaps.
  
 =====SDR Tap===== =====SDR Tap=====
radios/dr-m06th.1771024598.txt.gz · Last modified: by g5rkt