tweiss3

Are these "no ground plane" antennas, cause based on your photo, you don't have nearly enough ground plane under that antenna as installed.

TK890H. Just be careful if you want to also use it on ham frequencies. It's designed for 450-480, and needs additional heat dissipation on the final if you intend to use it below 450.

You aren't going to get survey grade location with anything unless you are running a survey instrument (such as a Trimble R6 running VRS to be on state plane with a complete data collector). Anything you will get in the retail market will still be 3m (10 ft) accuracy at its best, which would be enough for your use. If it were me, I would just use a basic tablet and a spreadsheet. Put columns for northing and easting, get a radio that can measure the signal in db or dbm, and put that in column 3. Add other columns for comments and note readability or not. Compile when you get home, then add to your software.

I run Larsen (NMO2/70SH and NMO150/450/758) both because they perform well and the spring. My truck roof is 6'7", and I regularly go in parking garages that are 7'2" without a place to stop and remove the antenna. I wouldn't waste your time retuning your existing antenna with a spring (spring is about $25), just get one with the spring already. The NMO2/70SH is centered on the ham bands, but is not bad on GMRS. The NMO150/450/758 is centered on the commercial frequencies, is better for GMRS, worse for ham but still acceptable.

I have the KMC72 which sounds amazing, and is nice and loud for noisy environments, but it has the Kenwood data port connection.

Back on topic. Thank you for this write up. It does demonstrate what has been said before, but the pictures are worth a thousand words. How did you hook up the TinySA? Are you using a bias tee or an attenuator? What equipment do you have for that. I have a TinySA, and do like it for the features to price ratio. I just don't have all the proper connectors to make hard connections without blowing it up.

This doesn't have anything to do with the base premise of this thread, which we should get back to.... But, @WQWX838, I have to disagree with your above post. As a licensed PE, I take no except to @marcspazmaintaining a title of engineer, be it senior engineer, engineer II or another. The distinction is the title Professional Engineer, the license and what you can and cannot do (i.e. stamp plans/calculations). I have a few young engineers under me that are not yet licensed, but they are still engineers. I also know plenty of other engineers in adjacent fields that the PE is not needed in their role for their engineering practice, and therefore may never get the licensure, yet sure are engineers. As a side note, in those fields, though the PE is not needed, it is often the gateway to move up into management, even though it will never be needed. @Sshannon correct me if I'm wrong, but that's how I see it.

Well, that's why the good ones, like the NMO2/70SH is colinear 3/4 design for 70cm.

I hear this. We are very much the minority. Then again, I can't stand the price point for what the Anytone 578 provides. I do think the FTM400 and TM-D71GA were worth the money, but I don't see a justification for the newly announced FTM500 (price or features). And this is coming from a guy that paid list on a NX5800.

You may have to ask a dealer that does a ton of volume. I really like the dealer I first placed an order with, but with the market as it is, I asked the local dealer that serves the whole state (and does pallets of radios a month). They usually get priority, and can make another one appear on the truck. The big downside is you pay list, and that price has been adjusted 2 times in the past 6 months that I'm aware of.

Mine is set with no tone on the ID, so you should never hear it, but it is compliant.

The Kenwood TK radios above do have Part 95 certification. They aren't terribly large, and in fact, they are what I give the kids for most activities (ski, field day, etc.)

A used Kenwood TK3140 would be a great option for your requirements.

This thread does bring up a point. Do answering requests count as activity?

Yea, I don't understand how the VHF stuff is so expensive all of a sudden. I just picked up an XTVA with the HHCH for an absolute song to play with, since I have a XTS5000 in UHF, and wanted to see if I could get a VHF and about choked at the prices.

Re-reading the rules for something else, thought of this thread: 47 CFR 95.1733(a)(9) Prohibited GMRS Uses: Messages (except emergency messages) to any station in the Amateur Radio Service, to any unauthorized station, or to any foreign station;

Yes, I used a NanoVNA H3 to tune duplexers. I did bypass the internal screen and use my computer with the NanoVNA-APP and increased the number of data points (and took my time). Afterwards, I took the whole repeater over to a friend who had real equipment, and ended up not changing a thing. The real challenge is to go slow, take your time and move in small increments. Also, make sure you have the correct jumpers, adapters and dummy loads before starting.

Legally? You can't anymore, Motorola won't sell it anymore, the radio is EOL. The software you are looking for is called Astro 25 Mobile.

Name of area. Like mentioned above, GMRS call signs are basically useless to me. Ham stuff is sorted by county or group of counties with call and city.

From my friend: The RF room shielding of an MRI is between 90 and 100 db. For a MRI scanner any RF in the 400 Mhz range the field strength would be in the 10 Tesla range this is way above the frequencys MRI uses 21 to160 Mhz .5 to 4 Tesla (41 Mhz per Tesla). Don't think it's a MRI Scanner.

Emailed, I'll let you know what he says. Hopefully he responds quickly. If not, I'll nudge him on my way home. I wonder if there could be an issue with the transformer feeding the machine.

No. I know a gentlemen that did the construction of the MRI rooms and the maximum outside RF levels that were allowed inside the room is extremely low. FRS shouldn't be able to be heard through the shell.

Many of the commercial radios have a jumper you can change to filter the bottom end out or not which may be needed for data. An example, Vertex Standard VX2500, out of the DB9 connector on the back: Normal is to filter everything 300 Hz and below out, but for packet, you need to open it up.

No, I have not. There is supposedly a pigtail for the portables, still waiting on part number and cost. I may start playing with this.

Truth. You can spend an entire cars value on a side by side without blinking.