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One comment, on the cable from the sig gen to the iso-T there should be a 50 Ohm load at the T to make the sig gen happy, feeding a good load, just don't feed the T will open coaxial cable at the T.

If you can monitor the signal sent to the ema receiver. I would use something like a small sdr (rtl-sdr) with multimon-ng ( https://github.com/EliasOenal/multimon-ng) that can run on a small raspberry

DTMF decoders are easy and I have several made by Motron that store and read out the DTMF sequence. However, the RF frequency and codes for setting off community sirens is not public information and

i am looking for a dtmf decoder to connect to a receiver to decode our local ema whelen siren to give a message on the repeater that the sirens have been activated i monitor the frequency that they

I'm pulling the discriminator audio off the VXR-9000 from PIN 6 which the manual states is 0-3000 Hz Analog output.? There's also an PIN 23 RXD HIGH that?is a Digital Output for DATA Communications.

The Raider documentation has multiple examples of how to set up the controller with various radios. Spending some time looking at these and documentation on the Vertex radio, along with an

Jared, Which device is handling the CTCSS? I know the VXR7000 only passes COR and requires modification (tapping a transistor on the VXR controller board) to provide COR with CTCSS. Not sure if it's

Has anyone had experience with a VXR-9000 and a Trident Raider LTR controller? I've got the carrier light on whenever I try to key up but I can't get the receive light to come on and handshake. I've

Jim was very soft spoken and very kind and friendly. I would have been there at the desk beside his.

Interesting anecdote, Harold...I met Jim at Sinc. in Aurora in 1990. I was visiting the area and decided to drop in to see if I could buy 4 invar rods. The front desk paged Jim and he took me to a

Do some searching in this forum and you should find a post from me that shows the Sinclair part numbers for the proper harnesses for these duplexers. ?I am sitting in the car conducting a net or I

“Whats odd is I've heard several stories about how Hams have got help from Sinclair & they were happy to help out. One fella told me he talked to a Mr. Sinclair about some duplexers years back. Idk

Q cavity works just as well as a pass can. I’ve tuned 6 can Q duplexers so that the can closest to the equipment is a symmetrical notch to give it a good pass response so other stuff outside the ham

I made several kits at the shop for the internal desense problem. Due to the cable routing, I used RG-223. It is more flexible than RG-400. Electrically, either one would work, but I liked the lay of

Al, Thanks for the thought about that. I covered that in one of my earlier post. I replaced those cables with RG400 a while back.

Has anyone mentioned in-cabinet desense? Some of those Yeasu DR series had cheep RG58 internal RF cables. Try hooking the transmitter direct to a dummy load and the receiver to a frequency generator

Mick, Actually no i didn't. Once I was told it wouldn't be ideal I pursued getting or making one that was. I still have it. Though I adjusted the can layout/order a little to allow the new harness to

Did you ever try the original harness? Mick - W7CAT

I remember receiving several factory tuned Q-2330 duplexers from Sinc. and seeing exactly what you describe when viewing the RL. I called and spoke to an engineer and was told that what I was seeing

Right or wrong, I have a M1225 programmed for the frequencies. I use it for the final notch tuning. I just keep turning down the signal from the service monitor and tune until it goes away and then