SteveShannon

Menu 2 did the trick. Thank you for the video...Jon 

Menu 4 is squelch 

What applies to ships at sea also applies to vehicles on the ground. Many years ago, after working on vehicle mounted radios for the military, I went to work for the oil industry, and radios aboard a fleet of ships. Well antenna gain issue cropped up often, as many think more gain means more "amplification" of receive signal, not realizing that it is also the radiation pattern impacting signal as BoxCar mentions. Very often, someone would place a 12 dB gain antenna on a small vessel and it had trouble talking to a larger vessel, even when in line of sight and close in distance.
An isotropic antenna would radiate like a sphere, while a 3dB gain antenna may radiate like a doughnut, 6 db gain antenna like a pancake, a 9 dB antenna like a thick tortilla or naan bread, and a 12 dB antenna like an LP record. So, with a 12 dB gain antenna on a small vessel, and a 0-3 dB gain antenna on a large ship, the only reliable communication (due to height differences between vessels) is when the little one is bobbing around and the radiation (transmit for smaller vessel and receive for larger) match up. This is where height and a 0-6dB antenna are much more useful, as they both have transmit and receive patterns that can reach other stations. Power is also an issue, as more power in a more focused radiation pattern can mean more distance. Cars and fixed radio stations are impacted the same way. 
When it comes to wattage and a mobile radio, Part 90 radios in use by public safety, commercial use, and hobby use are often limited to about 50 watts. Motorola, Vertex, Icom, Kenwood, mobiles are often 25/40/50 watts. Attached is a lab kit for Radio over Internet Protocol, with a Motorola XPR4550 UHF 40 watt mobile shown. I used Motorola mobiles for GMRS, with my CDM1550LS+ at 50 watts. GMRS radios usually max out around 50 watts too. Radiation exposure specifications will usually specify 6 foot or so (sometimes less) of separation between people and antennas in the UHF range at 50 watts. 50 watts mobile, with RG-58, and the shorter run in a vehicle than up a high mounted fixed antenna will get you ten to twenty miles, depending on terrain and local conditions. I myself usually run about 10 to 20 watts mobile and have no problem hearing people, hitting repeaters ten miles away, and transmitting back. The radio tops out at 10 watts, my RG-58 cable run is about twelve feet, and I have a decent antenna on the trunk which acts as a good ground plane. If what you have works, then let that itch go to a basestation, or a handheld that can be taken when not in your vehicle. Glad to see someone else get further into this......GMRS has taken off over the past few years for sure. 

Just wanted to let everyone know of the great experience I've had with this antenna.  I've used GMRS on and off for years (previously had a license years ago).  I've tried MANY antenna as a base antenna, and never found anything that performed well for my particular situation.  
I live in a valley, mountains on 3 sides (Alabama mountains, so not huge), and my city and the closest repeater are on the other side of the mountain.  My elevation is roughly 700ft, and the closest repeater (21 miles away) is at 755ft.  The mountain between peaks at around 1211ft.  After many iterations of different antenna, I could never hear the repeater, much less be able to key it.
With the Diamond X50C2, I can hit the repeater from home!  Added bonus - it's multi-band, so it will also work on MURS frequencies (I really wanted this since VHF does better than UHF over mountains).
The antenna is pretty wide-banded (advertised as 145-162 and 445-469, but has acceptable SWR outside of this, specifically HAM 2M and 70cm), and right at 5' tall, so it's not a monster antenna.  I highly recommend this antenna!

A good bidirectional watt meter can be very helpful for this purpose with the actual antenna connected. 

Nothing of metal that would effect the SWR, the antenna is mounted in my attic. Wood frame. foam insulation, asphalt roof tiles. I can live with 1.17 - 1.20. 
I'll throw on the last 2 ferrites and see what happens. I wouldn't think that I'd be losing that many watts from a 35' LMR400 cable, but who knows? It's reading a full 5 watts on the lower power frequencies.

I remember back in the day 675 was only for emergencies as stated as a condition on the license. Also, the GMRS licenses were issued with mobile call signs, mine was KG something (three letters and four numbers). Somewhere during one of the periods of the renewal processes mine was changed to my current license WQJT335.
I also remember back in the mid 70s that Orange County React was very active on CB channel 9 and used 675 as an intercomm link amongst all the React Monitors.  I can't remember the guy's name now that had a scanner and cb store on Euclid in Anaheim he owned one of the first mountain top GMRS repeaters on Santiago. I believe it was the 675 repeater that React used. I think his name was Bob Neal. He was very instrumental in promoting radio communications as a hobby. If it wasn't for him I may not have gotten knee deep into this hobby with the scanners, CB radios, and now GMRS. I never got the HAM bug for some reason and today I still don't and probably never will. 
I bought a ton of scanner crystals from him for my Regency ACT 10 channel scanner before Radio Shack came out with the synthesized scanner or was it Bearcat that had the first synthesized scanner?
I've had my GMRS license since the mid 90s and dabbled in mostly simplex use. Before I moved from Northen California 4 years ago, a friend owned a repeater on a mountain top and gave me permission to use it. I never really did use it although, I did programmed the channel in my company car and maybe used it a couple of times.
It wasn't until I moved to Arizona, I noticed that GMRS was very active and most of the repeaters were either restricted or closed systems for Club members. So, I decided that I better join so I can get in on using the repeaters and the fun. I'm glad that I did.
Now, I have several mobiles, a bunch of portables, and now a repeater station. I guess, I am infested with the GMRS bug and I hope there is no cure for it.

Notice what kind of tape they're using... *thumbsup*
 
Thanks again, S.S. 

I’ve never tried these, and there are several out there.  Here’s one:
https://off-roadcomms.com/products/self-adhesive-magnetic-antenna-mount-plate
 

You should be fine. There are also vacuum mounts or peel and stick steel discs that the magnetic mount will stick to. 

You had me at .45 ACP. ? 

You should be fine. There are also vacuum mounts or peel and stick steel discs that the magnetic mount will stick to. 

I’ve never tried these, and there are several out there.  Here’s one:
https://off-roadcomms.com/products/self-adhesive-magnetic-antenna-mount-plate
 

You should be fine. There are also vacuum mounts or peel and stick steel discs that the magnetic mount will stick to. 

This might be something you would want to try.  It's similar to a Ventenna.
https://w6nbc.com/articles/2018-tbdQSTsmallwonder.pdf
 

This might be something you would want to try.  It's similar to a Ventenna.
https://w6nbc.com/articles/2018-tbdQSTsmallwonder.pdf
 

Reach out to Rich

Interference near a warehouse is not surprising as there are a myriad of commercial and industrial devices that can produce RFI, particularly in aging buildings.  Variable frequency drives used to run HVAC equipment are a common sources of electrical noise.
http://www.vfds.org/vfd-and-rfi-708163.html
"The conclusion, later confirmed by the VFD manufacturer, was that the building, without a solid earth ground, was acting as an antenna."

The last two of the frequencies you listed are not GMRS frequencies, but the first two are only 500 Hertz away from the interstitial center frequencies - it may be that your display just doesn’t show the fourth place.  You might be picking up either interference or digital transmissions on those frequencies.  Unfortunately I have heard that there are some low powered devices that have been imported, such as baby monitors, which use those FRS frequencies.
From the regulations:
The GMRS is allotted 30 channels - 16 main channels and 14 interstitial channels. GMRS stations may transmit on any of the channels as indicated below. 
(a)462 MHz main channels.Only mobile, hand-held portable, repeater, base and fixed stations may transmit on these 8 channels. The channel center frequencies are: 462.5500, 462.5750, 462.6000, 462.6250, 462.6500, 462.6750, 462.7000, and 462.7250 MHz. 
(b)462 MHz interstitial channels.Only mobile, hand-held portable and base stations may transmit on these 7 channels. The channel center frequencies are: 462.5625, 462.5875, 462.6125, 462.6375, 462.6625, 462.6875, and 462.7125 MHz. 
(c)467 MHz main channels.Only mobile, hand-held portable, control and fixed stations may transmit on these 8 channels. Mobile, hand-held portable and control stations may transmit on these channels only when communicating through a repeater station or making brief test transmissions in accordance with § 95.319(c). The channel center frequencies are: 467.5500, 467.5750, 467.6000, 467.6250, 467.6500, 467.6750, 467.7000, and 467.7250 MHz. 
(d)467 MHz interstitial channels.Only hand-held portable units may transmit on these 7 channels. The channel center frequencies are: 467.5625, 467.5875, 467.6125, 467.6375, 467.6625, 467.6875, and 467.7125 MHz. 

Just looked. I think this is what you want to use.
https://www.winhelponline.com/blog/view-winhelp-hlp-files-windows-10-with-winhlp32-exe/

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.

On the receiving/monitoring radio you must have the correct RX freq.  You can put in the TX freq, but it’s not needed for monitoring.
On the transmitting radio, you must have the correct TX freq and tone.  Yes, the tone goes in TX CTCSS/DCS.  Leave the RX CTCSS/DCS empty.  It doesn’t really matter if you have the RX frequency correct for this test.  
Later on you’ll want to have both radios set the same so either one can talk to the other through the repeater, but for now I don’t want to confuse you with anything you don’t absolutely need.
The default bandwidth is good.  That’s wide band.
 
I’m old and I’m going to bed. ?
Ill check in sometime tomorrow afternoon.  This should be enough to get you started.  Go ahead and ask anything you need.  There are smarter folks than me that might be able to help you more than I am.

On the receiving/monitoring radio you must have the correct RX freq.  You can put in the TX freq, but it’s not needed for monitoring.
On the transmitting radio, you must have the correct TX freq and tone.  Yes, the tone goes in TX CTCSS/DCS.  Leave the RX CTCSS/DCS empty.  It doesn’t really matter if you have the RX frequency correct for this test.  
Later on you’ll want to have both radios set the same so either one can talk to the other through the repeater, but for now I don’t want to confuse you with anything you don’t absolutely need.
The default bandwidth is good.  That’s wide band.
 
I’m old and I’m going to bed. ?
Ill check in sometime tomorrow afternoon.  This should be enough to get you started.  Go ahead and ask anything you need.  There are smarter folks than me that might be able to help you more than I am.

Program one to monitor the repeater. (Correct frequency, no tones)
 
Transmit with the other to the repeater input frequency and with the right input “privacy” tone. 
 
Transmit on one and listen on the other. In a successful test you should hear yourself. 
 
Keep them far enough apart that the transmission doesn’t de-sense the receiver.  My radios work just fine on one end of the kitchen table. 

Thank you Lscott. Took me a while but it did work. I have a Win 10 pc that I rarely use (batt. issues), did all the "mods" on it. Worked out. Might go in and print it all out, or save it to a PDF to use on a "good" pc.
Thanks again.
Boatiac