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Repeater Grant Project Update
October 27, 2025 —
The team discussed purchasing and configuring a Motorola repeater system, including technical specifications, pricing options, and installation requirements. They explored various features and capabilities of the Motorola SLR-8000 repeater, such as remote diagnostics, internal monitoring, and networking options, while also considering alternative equipment configurations to balance cost and performance. The group addressed concerns about maintaining the repeater and networking infrastructure, including the need for IP Networking technical expertise and the importance of proper labeling and serial numbering of equipment.
Next steps
- Al: Create and attach HPARC labels/serial numbers to all equipment stored at Len’s house
- Joe: Reach out to Andrew regarding networking setup and IP configuration for the repeater
- Team: Assemble a team to work on 5 GHz communication links for the network
- Team: Research and quote additional 5 GHz microwave links for remote receive sites
- Len: Order hardline cable with one connector pre-installed before grant funds expire on the 1st
- Andrew: Program the repeater upon delivery using Motorola programming software
- Team: Set up dedicated PC at the site for remote access and diagnostics
Summary
Grant Equipment Purchase Discussion
Al and Joe discussed purchasing equipment for the grant, focusing on the SLR-8000 repeater and its output power settings. They determined the equipment only needs to be purchased by the 1st, not installed or operational, and Joe suggested placing it in Len’s garage for initial inspection. They also discussed the need to investigate if the repeater can adjust output power between analog (100 watts) and DMR (30 watts) modes. Joe mentioned that while one unit would be more space-efficient, there was uncertainty about the 8000 model due to its newness and limited vendor experience.
Motorola Repeater System Purchase
The team discussed purchasing a Motorola repeater system, with Al suggesting the club invest in quality equipment since they have the budget for it. Joe shared a rough budget allocated for the repeater, and the team agreed to proceed with the purchase if tariff protection was provided. Motorola being a Midwest US company, mentioned any applicable tariffs have already been factored into the cost. They also reviewed an email from Andrew AJ0WX containing technical specifications and limitations for the repeater system, which Joe found helpful in understanding the system’s capabilities and networking options.
Repeater Vendor Quote Review
The team discussed vendor quotes for a repeater purchase and determined the Sandy’s quote was most transparent and competitive, though some additional components might be needed. Al and Jeff reviewed technical specifications for power redundancy options, confirming they needed an A/C input with battery revert capability, though they noted this was not the same as an external battery backup kit. They agreed to proceed with Sandy’s quote and add any necessary modules separately.
SLR8000 Repeater Features Overview
Al and Joe discussed the features and components of the SLR-8000 repeater, including the internal pre-selector, GPS functionality, and various interface options. They clarified that some components, like the external GPS receiver, are not included in the basic unit but can be added separately. They also reorganized a spreadsheet to better categorize the options and discussed the need for quotes on certain features. The conversation concluded with a review of the included network functionality in the basic SLR8000 model.
Repeater Features and Specifications
Al and Joe discussed the features and specifications of a repeater, focusing on its remote diagnostics capabilities, internal monitoring, and self-contained cooling system. They confirmed the repeater includes all necessary features for the DART’s requirements, such as IP-based networking, built-in monitoring, and mechanical thermal serviceability options. They also determined that no additional ventilation clearances or rack space would be needed.
Repeater and Networking Infrastructure Planning
The group discussed concerns about the repeater and networking infrastructure, particularly regarding John T. Garden’s potential retirement and the need to find younger, knowledgeable members to take over. They explored options for data links between remote sites and the main location, including 5-GHz RF links that cost approximately $500 per pair, and discussed the importance of having redundant internet connectivity through satellite links as a fail-safe measure. The conversation highlighted the need to balance the antenna project with maintaining the repeater and networking infrastructure.
Equipment Labeling and Pricing Review
Al and Joe discussed the need to label and serial number equipment at Len’s house. They reviewed Sandy’s quote for equipment, noting a discrepancy in pricing for the SLR-8000 repeater and decided to call Sandy’s Communications and spoke to Jeff to clarify pricing and discuss equipment needs.
SLR8000 Repeater Purchase Discussion
Al and Joe discussed the purchase of an SLR8000 repeater and related equipment for the Hazel Park Amateur Radio Club. They placed an order with Jeff from Sandy, confirming details about the external pre-selector and discussing options for audio interfaces. The club plans to start with analog operation and potentially migrate to DMR in the future, though control capabilities in analog mode may be limited.
Motorola RDAC Software Features
Al and Joe discussed the features and capabilities of Motorola’s RDAC software, focusing on its use for monitoring and diagnostics, including SWR, power output, and voltage readings. Jeff told them software allows for programming multiple channels, including analog and digital, but requires the use of programming software for channel swapping. Al clarified that digital voting, which expands on IP Site Connect topology, requires a master and a peer repeater, with the master needing the digital voting option enabled. They also discussed the benefits of the SLR-8000 repeaters, including a longer warranty and included features like digital voting and mixed mode operation, which allows for analog and digital operations but without transcoding. Al and Joe noted that remote access to RDAC is only possible with a pure digital channel and an IP connection, and they explored alternative methods for remote monitoring and programming using a laptop and USB cable.
Motorola’s VIP Site Connect Evolution
Al and Joe discussed the VIP Site Connect Environment, focusing on the ability to connect laptops at the site to repeaters for local and remote programming. They explored Motorola’s approach to mixed-mode operation, which allows for a transition from analog to digital, as seen in a recent project at Cal State University Northridge. Jeff noted that Motorola’s engineers, originally ham radio operators, have been replaced by software developers, leading to a shift in the company’s focus. They also touched on Motorola’s acquisition of Yaesu and the subsequent spin-off, as well as the history of Motorola’s branding in the radio industry.
Radio System Functionality and Ordering
Al and Jeff discussed the functionality and limitations of digital and analog modes in radio systems, including the audio quality and accessory connector functionality. They clarified that the RDAC and programming software are available for free download, and explained the structure of ordering the SLR8000 station, including the separate charges for different band selections. They also covered the use of external battery backup, noting that the station has built-in battery revert and automatic recharge capabilities, which can be configured using the programming software.
Station Configuration and Battery Requirements
Jeff discussed the configuration of a station with recharge capability, noting that it would recharge a backup battery bank at a slow rate of 5-amps. They clarified that the necessary cable and connector would be included with the station. Jeff explained the station uses 24-volts for battery backup, requiring users to wire 12-volt batteries together to achieve the necessary voltage. They also discussed the need for a wireline tone control card and an external circulator, with Jeff clarifying that these were arbitrary requirements for Motorola. Joe mentioned that a dedicated PC would be allocated for the site, potentially mounted in a rack. They compared the costs and space requirements of using an SLR8000 versus an SLR5700 with an external amplifier, noting that the latter option was more economical and had the advantage of reducing the load on the station.
Motorola Repeater Supply Chain Update
Jeff discussed the availability and pricing of Motorola SLR-8000 and the SLR-5700 repeaters, noting a 2-3 month lead time for the SLR-8000 due to supply chain issues. They agreed that using the SLR-5700 with an external amplifier would be a cost-effective alternative, with Jeff offering to provide a quote. Al mentioned that most customers who wanted the SLR-8000 ended up choosing this option instead. They also discussed the recent price increase for Motorola radios, which did not affect repeaters. Jeff agreed to send a quote directly to Al, who will distribute it among the team for review within the next few days.
Motorola Repeater Leasing Discussion
Jeff went on to say leasing airtime on a local NXDN system and the revised quote for a Motorola SLR-5700 repeater. They clarified the repeater can run on 12-volt DC power and has a 5-year warranty with tech support. Jeff explained that programming the repeater involves setting frequencies, tones, color codes, and other configurations. Al inquired about the VHF frequency charge, and Jeff clarified it is a one-time option code selection for band preference, which is pre-installed before shipping.
DMR Repeater Configuration Discussion
Jeff discussed the programming and configuration of DMR radios, including the use of time slots and color codes. They agreed that the SLR-5700 repeater might be the best option due to its affordability. Jeff mentioned the repeater would ship immediately if ordered, along with necessary cables and accessories. They also discussed the importance of proper SWR monitoring and the repeater’s safety features in case of antenna failure. Joe agreed to forward the latest quote to Bob for approval, and they planned to discuss 5 GHz communication for the network in the future.
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