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I have for sale this Micro Magic 6 cavity flat pack duplexer in very good shape. Currently tuned for 462.65TX 467.65 RX with N female connectors. model: MICRO-4201-C6-3 S/N: 011422010 micromagic2way.com This is lightly used but has a couple of minor scratches, but otherwise works great. I believe this is able to be tuned into the 70cm ham band if desired. I will ship for $75.00, brand new over $160.00 I have jumpers for TX and RX if needed, will throw those in. 73 Chad WI9HF

I am in need of one PMLN5644BS rear connector board for an XPR8400. This is the board in the rear of the repeater that has the accessory connector and Ethernet connector on it. Please message me at my email or my email listed on qrz if you have one you want to sell/part with. Thank you, Jacob AD0JA Picture of what I need:

Have a VXR-7000 with no power out. S-AU93 module apparently 'cooked'. Various datasheets suggest this is a 50-60w part Hard to find a source, most searches end up referring to an S-AU3 - RF Parts... https://www.rfparts.com/sau3.html - 17w part. Oddly enough the FCC ID leads to documentation of two different units, each with a discrete PA transistor vs this integrated module. Any clues? Advice?

Desense is driving me crazy. Might be a short ride there. ? Warning: This will be long & descriptive. In hopes I cover everything for getting good advice in return. Last year I bought a new Yaesu DR-2X & a new Hustler G7-144. I'm using some older Andrew's 1/2 heliax. The duplexer was purchased from a wholesaler as new old stock. It's a Sinclair Q201GC 6 cavity (7" diameter) set in it's own cabinet. The data sheet says it left Sinclair in 2015. Originally tuned to 170Mhz. This makes the 4th repeater I've messed with in the 26+ yrs of being a ham. I've done lots of tower & antenna work over the years. I even used to work for a tower company many years ago climbing. One thing I never messed with was tuning duplexers. So this time I wanted to do everything myself. One reason was I didn't want to haul this large duplexer many miles away to get it tuned. I didn't have a safe way to haul it sitting upright (vertical). So I decided it was time to invest in some test equipment. For tuning & other ham radio projects. Originally I already had a Lite VNA 64. I used it to check the duplexer cavities individually to see if they will tune down from 170MHz to 145MHz. They looked like they would. So I decided to move forward with this set. Now, as I mentioned, I was told these were "new old stock". They look great! Still shiny. They had a cardboard box cover over the cabinet for shipping. Plus as stated the data sheet from Sinclair inside. One thing that strikes me as odd, was all 6 of the brass dust covers for the trim capacitors were missing. I'm to understand those are important to keep the caps clean. I've gotten some great help from people here on repeater builder to get started. I may have even gotten on some nerves asking so many questions lol. It was mentioned I will need to make a new harness for the duplexer to get it down to 145.330. I was able to get information on the correct lengths for the cables. Using RG214U & silver N hex crimp-on connectors. I made each cable 13.5 inches long. I used silver plated amphenol tees. I had to buy the tees used. As they were impossible to find new at a reasonable price. With the cable, connectors & tools I had nearly $300 dollars tied up in just materials to make the harness. I needed some more test equipment to begin alignment of the duplexer. Keep in mind this is my first time tuning a duplexer & getting equipment for it. I was originally going to invest in a used VNA like HP, Keysight etc. But the turn off there was age of equipment vs cost. Then being worried about buying old equipment that might be a problem later with failing parts due to age of components. Then finding parts to repair them. Plus most everything that was suggested still only had about 100db of dynamic range. Which wasn't going to be enough for this duplexer. I started looking around at other equipment that's newer. Plus more in my budget. I decided to buy a LibreVNA. It's advised as 90 to 100db of dynamic range & seemed to be better than my Lite VNA 64. It still wasn't going to get me past 100db for final tuning. But it was great for all the individual cavity tuning. To final tune I decided to buy a Siglent SSA3021X + spectrum analyzer with tracking generator. I used this stuff to tune the duplexer. It appeared to have about 120db of rejection. When I hooked everything up & started testing out the repeater it all worked OK. But I'm not one to just stop there. So I decided to start testing for desense. I also have a TinySA ultra. This has a spectrum analyzer plus a signal generator. I'd generate a low power signal with that & listen to the DR-2X receiver speaker by ear. Get the signal down low & listen. Then engage the transmitter & listen for any changes to how the receiver sounds via the speaker. Sure enough I was hearing changes aka desense. I tried this with the repeater hooked to the coax & antenna. Then I'd try it into a 250 watt TX/RX dummy load. It was worse with the coax & antenna hooked up. But it was also still slightly present into the dummy load that bypassed the hardline & antenna. Now for the coax & anten

One thing I'd like to have in my supply box is an iso-tee. Today while searching I came across this repeater builder post below. Then I found another site that sounds like the same thing but with pictures. The pictures helped me visualize it nicely. Are these good plans for one or should I keep looking around for a commercially made one on the used market? If so is there one recommended? On ebay I'm seeing a lot of sma connecter ones. I'd prefer N connectors if possible. Wanting it for repeater stuff. To test for desense & receiver sensitivity etc. https://repeater-builder.com/projects/iso-tee-project.html https://urgentcomm.com/tower-site/every-toolbox-needs-one-of-these

Decibel Product DB-4060-WOC-C for sale. It has not been modified for 144-148 MHz use. Pulled during system upgrade, very nice condition. I don’t have the need or the time to modify them for amateur use. $500 plus shipping, from 89436 TNX Jim Sent from Outlook Virus-free.www.norton.com