SteveShannon

The preset tones would be a real annoying thing. Turn off the display off timer if that’s a setting, but set it for lower brightness and/or pick up a spare battery. I have a radio that turns its display off also and it annoys me also, but I haven’t decided what to do about it. I turn the volume up/down to get the display.

A good rule of thumb is to always leave the receive tones out when first configuring your radio for a repeater. Any tones you enter for receive filter your reception and could hamper your ability to hear the repeater. If you enter the correct receive frequency, but no receive tones, you will receive everything transmitted on that frequency that is within range. If you’re not sure if you’re in range, get closer. Seeing your meter deflect while you press PTT, probably means the transmitter is transmitting, unless it’s an SWR meter during transmit. Your radio does not receive while it’s transmitting. Seeing the meter deflect when you’re not transmitting can be an indication of signal strength, assuming that’s what your meter is set to indicate. Knowing the radio you’re using helps us to help you more easily.

1. Yes, but you only have eight frequency pairs to choose from. 2. Yes, but you’re limited to no more than 50 watts. 3. Yes, or Morse Code, and it must also happen during long conversations and at the end. 4. Here’s where I’m going to let others review what you listed.

Repeaters (well, all stations) are required to be identified using the call sign of the operator/owner. That ID must be transmitted every fifteen minutes during a conversation or at the end of a conversation. The identification can be transmitted as voice or Morse Code (it’s the sound of Morse Code, not truly CW). It’s usually done for a repeater by an automated process as part of the repeater controller or by a separate device such as the ID-o-matic. That’s what you are hearing.

Well, the icom brochure lists them as 5 watts for both the UHF and VHF version, even intrinsically safe models. Are you saying that someone might have turned the output down to further reduce the risk potential? They're nice looking radios and of course I have no idea what the person bidding on them right now wants them for. I don't really need them. I think I'll let the other person have them for a good price. There's no point in just running up the price for them.

4, 5, and 6 are typically sold in a single box, called simply a repeater. If you don’t want much power you can even buy a single box that includes the duplexer. The shopping area of this site has both types of repeaters. So would most commercial radio stores or online radio shops. Good luck!

I haven’t bid on them and I’m not sure I will. They’re up for 3 more days and the current bid is still just $61.

The FCC ID is AFJ289402. Also these are intrinsically safe radios, which I thought interesting, although I have no need for this.

I’m looking at a pair of Icom F4161DS handheld radios at an auction site. They’re NXDN and I might be interested in playing around with them. I’ve got a three days to decide whether to bid on them or not. Do any of you here have the necessary software?

Moved to new thread.

But doing a damned fine job of it!

If your two radios are close to each other when you're transmitting on one, the other may be de-sensing, which is what happens when a nearby transmission overwhelms a receiver. Give one of your radios to a friend and have him go across the street and then see if he hears you through the repeater.

Absolutely he would need guys. But I understood him to say that he has a single 40’ mast that’s 1.25”. Maybe I misunderstood that, but if it’s true his entire mast will flex. Mid-guying would be necessary, but all guying increases the vertical load as well. You have a push-up mast that has a larger diameter base. So the bottom sections are much more rigid.

From the CDC: https://www.cdc.gov/niosh/topics/repro/nonionizingradiation.html If you are pregnant, exposure to nonionizing radiation is usually not hazardous to you or your unborn baby. However, there are some specific workplaces using nonionizing radiation that could increase your chances of having a baby with a birth defect or other reproductive problems.

Welcome! A great way to learn is by listening to scheduled nets and then, when you’re comfortable, join in. You’ll do just as well as we all did.

I can’t weigh in on mobiles yet, but I set my handheld to display multiple lines rather than two channels.

If you’re that close to the repeater you may be able to listen to the repeater input frequency which is probably 467.550 MHz. Then, if someone uses the repeater you can scan for the input tone.

Look to see what your settings are for ANI.

Goodwill is a huge 501(c)(3) charity, not a “for profit” company. Here’s a link to their most recent 990 form: https://www.goodwill.org/wp-content/uploads/2022/12/GII-Public-Inspection-Copy-990-990.pdf

My wife has had maybe 40 of these (MS and they used to track the progress by scanning multiple times, with and without gadolinium enhancement) and I’ve had 3 or 4. I always wonder which of those sounds mean I need to hold my breath. You can’t hear it very well on that video, but the background sound that sounds like a fetal heartbeat is what I imagined/misunderstood you were hearing on the radio.

That’s really the important thing!

Thanks! That’s a thought. As I recall, maybe incorrectly, the characteristic sound of an MRI is from a compressor used to supercool magnet coils. I don’t know if the compressor is inside the magnetic shielding or how that all works, but maybe the VFD for the compressor is causing problems. Anyway you look at it RFI within a hospital could be bad.

Very cool, @Lscott! It would be great if the antenna manufacturers all provided EZNEC models of their antennas. I’m thinking it the DB404-B and how the folded dipoles can be rotated on their mast to accomplish exactly what you’ve illustrated.

No RF should be able to be heard through the shell. According to the article I linked, RF should be shielded to 100 dB, but according to the OP, something recognizable as RFI matching the sound of the MR scanner is being received 3/4 mile away. Just for curiosity’s sake, can you ask the gentleman if that sounds right?

Another thought. I wonder if the communication system in the MRI uses an FRS radio on that frequency and you were simply hearing it.