UPDATE June 29, 2016: Text updated below.
- RLC-MOT and TS-64 boards have been removed and replaced with the Repeater Builder SC-50 board.
The SC-50 board has a Motorola Micor squelch and an FX465 CTCSS decoder/high pass filter built-in. This simplifies the interface between the DR-1X and the S-Com 7330 and provides better CTCSS attenuation in the audio path.
For my second DR-1X modification, I removed the internal power supply and mounted the SC-50 board so that the DB-25 connector is accessible from the rear, as seen below:
The following notes still apply:
April 11, 2015 (Original post)
Justin NV8Q and Chuck N0MXI installed the new Yaesu DR-1X Digital Repeater to replace the GE Mastr II repeater at the Minneapolis site. This repeater is setup in mixed-mode (Yaesu calls it Auto Mode Select). Digital transmissions will only be repeated locally on the 444.850 repeater, and will not propagate to the rest of K-Link. Analog transmissions using PL 162.2 will be repeated locally and to K-Link just like normal. The repeater is running 90 watts (the old one was 55 watts). The DR-1X is running in ‘Open’ DSC mode so any digital DSC code will pass through.
If you don’t have a Yaesu digital radio (you are missing out!), you will want to use Tone Squelch (CTCSS decode) on your radios so that you can eliminate the digital noise you would otherwise hear if somebody is using digital. Tone squelch eliminates all this noise without missing analog calls. If you need help setting up your radio please ask us to help!
Our particular DR-1X repeater has had some really nice modifications to it:
- Masters Communications SC-50 Squelch/CTCSS board. This provides superior squelching action with reliable CTCSS decoding and filtering.
- 200 watt Henry amplifier, de-rated to 90 watts. This requires about 11 watts of drive.
- Custom S-Com 7330 wiring interface and programming script to make the DR-1X available to analog and digital calls with minimal interruption.
This repeater will process analog or digital calls while it is idle. During a call, it will be expecting (and will only process) whichever mode is currently being used. During a digital call, if a user un-keys and the repeater becomes idle for two seconds, it returns to idle mode and is available to digital or analog calls. During an analog call, the repeater holds analog mode active for six seconds. This hold makes the repeater more available for conversations across the linked system. During an analog call, if one user un-keys and the other user doesn’t reply within 6 seconds, the repeater enters idle mode and is available to digital or analog once again.
It should also be noted that if the repeater is idle, it takes about 1/4 second to key up at the beginning of an analog call. You can bring the repeater up in analog mode by keying your mic for one second before talking.
During Skywarn Net operations, digital mode will be disabled.
Instructions on how to interface the S-Com 7330 to the Yaesu DR-1X (without using the Arcom ADR) can be found here.