It looks like we might be able to get our hands on some IP-223 units. i have not worked on these, I have seen them in service. Normally, you have a dispatch console that talks via Ethernet to the IP-223's. Can two IP-223's talk to each other, or is there a different Telex box that can then talk to to a 223? I would like to be able to have a 223 at a remote site, and I could then have an appliance box that I could wire in a microphone and a speaker, and work with that remote radio, not using a large console. Tom K8TB

What digital modes are in use commercially? A group I am associated with has one of their departments on a conventional (non-trunked) UHF digital repeater. They have both Kenwood and Motorola portables. Apparently, a now departed supervisor arranged to have the system set up and acquired some portables with the system. The rest of the company channels are regular analog. Poor record keeping, no one currently on staff knows who the system was procured through or what to order for additional radios. It is not P25 or DMR, as far as I can tell. What other options are out there these days? Thanks, Michael WA7SKG

Functional vintage RF signal generator, good from 25MHz. - 960 MHz. + other functions. This is an estate item; we'd would rather see it go to someone who'll use it than the dumpster. Includes original manual. Unit weighs nearly 20lbs. I use Pirate Ship for reduced shipping costs; can give quotes on shipping. Photos here: https://photos.app.goo.gl/BMHm42KsGioaJeMs7; 30dB attenuator was inline for all measurements. The unit was being offered across multiple platforms. Email me directly as I don't read the list traffic; I'm good on QRZ. Thanks, Robin Midgett K4IDC

Fully functional Radio Specialty FM deviation meter / scope. This is from an estate, not interested in trades. $150, shipped, CONUS. Unit is in excellent condition, fully functional. Photos and videos here: https://photos.app.goo.gl/MVL8knixhnRkzXqL7 Thanks, Robin Midgett K4IDC

Q: Is LMR400 coax cable suitable for use in repeater antenna systems? ChatGPT said:Yes, LMR400 coaxial cable is commonly used in repeater antenna systems and is suitable for such applications in many cases. Here’s why: ChatGPT goes on to list LMR400 coax's selling points: low loss, high power handling, durability (?), flexibility & broad freq. coverage. I then rephrase the question: Q: Is LMR400 coaxial cable suitable for use in duplex antenna systems where low PIM is important? ChatGPT said:LMR400 coaxial cable is generally suitable for many antenna systems, but when low PIM (Passive Intermodulation) is critical ­ such as in duplex antenna systems where multiple frequencies are used simultaneously ­ it may not be the optimal choice. Here's why: ChatGPT then explains what PIM is & why it's a problem. But then it fails on suggested alternatives: Better Alternatives for Low PIM: For systems where low PIM is a top priority, coaxial cables designed specifically for low PIM performance are recommended. These typically use special construction methods, such as: Foam dielectric insulation (to minimize signal distortion). Improved materials for the inner conductor and shield, such as silver-plated copper or tinned copper, which can reduce PIM levels significantly. Special PIM-tested connectors to further minimize PIM sources. Foam dielectric & tinned copper lowers PIM? Not in my experience. Do use ChatGPT with caution - it still has much to learn ;) Bob NO6B

Anyone have a schematic drawing of the Micor Compa (repeater) station time out timer TLN4636 ? I thought I had one in my Control and Appications (orange strip) manual but no joy. I have the CMOS version, but not the transistor (discrete) version. -- - Regards, Karl Shoemaker To contact me, please visit SRG's web site at http://www.srgclub.org for the current email address.

Hi, Let me know if you get this. Got a question to ask, do you purchase items or stuff through Amazon. Albert

Happy holidays! The Wa. state EOC asked me if I could program a few Midland XTR / SYNTECH 11 (Low Band) radios. I replied "Sure" but then I discovered my software had been modified for six meter ham. The radios require 45 mHz frequencies. (4 channels) I am hoping I can come up with un-molested programming files. Fingers crossed! Thanks. Tim Hardy AE7TH / NNA0GQ

Just to be, well, it's Syn-Tech II, not 11...lol! Just like Mastr II. ;c)

Hello all, Looking for a 19" radio/equipment cabinet, preferably somewhere in the twin cities/greater Minnesota area. Ideally, about 3' high, no more than 4' to house a receiver & link transmitter. Please reply if you have something. Thanks! Mark

Hi All, Subsequent to my previous question I have received a Victron charger. Later today I will do some testing to see if it is RF noisy and if the settings can be customized. However, I have another question. My old set up was a Samlex power supply with the battery charger. It would use the mains and then switch to the battery when needed. Now of course I can't use the charger side of it, which is why I got the Victron. So, I suppose I could skip the Samlex and just run on the battery with the charger. But then if the charger or battery has issues then the repeater is kaput. And of course, LiFePO4 batteries have brains which can have issues and lock you out. So, I am thinking of using a 120VAC relay which is activated when the mains is on and the NO contacts allow the repeater to run on the mains. Then if the power goes out, the NC contacts run the system from the battery. How are you folks doing it with LFP batteries?

I have a few larger weatherproof outdoor enclosures available. These were used in the electric utility industry to enclose controls for switchgear. All connections go through the bottom panel. Minimum internal dimensions are approximately 17" x 15" x 9", weight is ~50lbs. The cabinets are made of steel with a neoprene gasket & drip lip around the front door; the gasket might need some attention as these cabinets are ~40 years old. The cabinets have a mounting bracket along the rear that extends above and below the back panel. The front door can be pad locked. There is an internal panel that swings out and it can be removed if desired. There is a 120 VAC duplex outlet & a screw terminal strip inside on the raised, drilled and tapped back panel. All the internals are still in the cabinet, new owner can strip out what isn't needed...it'll take an hour or less. These cabinets are great for remotely located antenna connections, antenna match units, switches, etc. $100 each, several available. Photos here: https://photos.app.goo.gl/tfiiuNFP3Ft5LXQV6 Thanks, Robin Midgett K4IDC

I have a few smaller weatherproof outdoor enclosures available. These were used in the electric utility industry to enclose controls for capacitor banks. All connections go through the bottom panel. Minimum internal dimensions are approximately 13" x 7-1/2" x 6", weight is ~10lbs. The cabinets are made of plastic with a rubber O-ring gasket around the front door. The cabinets have an aluminum mounting bracket along the rear that extends above and below the back panel. There's a spring loaded stainless steel latch on the door that can be pad locked. There are threaded inserts in an aluminum panel on the inside of the door. There are bosses with stainless steel female threaded inserts in the back panel, 6-32 TPI stainless screws included. Bulkhead mounted PolyPhaser surge arrestor included. Units have been outdoors for more than 10 years, so there is evidence of that. These cabinets are great for remotely located antenna connections, antenna match units, switches, etc. $60 each, 6 available in Nashville, TN; will ship. Photos here: https://photos.app.goo.gl/xHt2xbfdmLtzL2XX9 Please contact me directly because I don't read the list traffic; I'm listed on QRZ. Thanks, Robin Midgett K4IDC