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The duplexer and cables in itself will cause you to lose approx. 30% of inserted power. If the duplexer is not tuned properly, you will lose more of your inserted power and you may be very well left with just only a handful of milliwatts of output power and that will affect your Farz.

@SteveShannon Thanks a bunch for the link. I did try to search just like that poster and read several of the results but did not see the one you sent. I have some reading to do.

The extracts used by this site are not daily. You’ll appear in the live FCC database nearly immediately, but it can actually take three or four days for this site to get the data in an extract and sometimes even longer. That affects other sites as well, such as this one which lets a person know whether a GMRS licensee also has a ham license: https://gmrs.app/?wsir477# The other common thing is that people sometimes supply the wrong call sign. You didn’t, but it definitely happens.

Happy Father’s Day to you! This might help:

I would say a 2 way radio is harder to find than a cellphone is. You can ping a cell phone at will with the proper equipment and have it give it's position away. You can't do that with a normal 2 way radio.

Tuning a duplexer for a single pair gives the best performance with minimal insertion loss and better isolation from other frequencies/channels. Yes you can tune a duplexer to cover all eight GMRS repeater pairs but that is a compromise. Doing this increases insertion loss and reduces isolation. Both will lead to poor performance. And the whole point of a duplexer is to isolate the repeater pair from other frequencies/channels.

This is true. We got away with way more when we were kids compared to today's kids. There were no cell phones and not many had the 16mm cameras to record stuff. And one could just throw away any photographs and negatives. On topic. It is pretty easy for law enforcement and the military to monitor and track two way radios and cell phones. They can't hide unless everyone leaves all electronic devices at home. Some people have had warrants issued or have been arrested by using cell phone data and/or security camera feeds.

Not sure why all the concern about phones. If you are there someone likely recorded you on their phone and has already uploaded it to social media.

Sometimes it takes a bit for your license to show up on FCC database. Give it FCC a day and try again.

I've been looking into building a briefcase repeater using a couple of HT's. It's a summer project I'm working on with my sons. It'll be used mainly for personal communication at some rural property where we don't quite get good coverage with HT's. I will probably order a tuned duplexer from BuyTwoWayRadios. The 462.725/467.725 pair is fairly open in the areas where I might be traveling and there are no repeaters near the property. I can't find a good explanation as to why the duplexers need to be tuned for a specific frequency pair. Why wouldn't a duplexer tuned for GMRS UHF bands be able to cover all pairs as long as the TX and RX radios had the proper offsets on them? As usual, thanks for your help and Happy Father's Day...

I have read that manufacturers wanted it approved so they could sell the same units in the US and Europe. I have no idea if that's true, but it makes sense. If it's true, the manufacturers wouldn't care if the FM feature goes unused and US users would have no incentive to use it.

It could be a number of different things causing the noise. Knowing what vehicle he is using and how it is powered will help. All of the LED bulbs and computer modules on newer vehicles can cause noise. I had to put clamp on ferrite beads on the wires powering my radios and I even put one clamp on ferrite bead on each end of the main wire going from my alternator to the battery on my 2023 Ford Escape. I still get an occasional whine when transmitting. But it doesn't happen often enough to chase down the source. Another thing people sometimes overlook are al of the LED street lights and LED bulbs used in homes. I know the cheap LED lights in my garage are very noisy on 2m, 70cm and GMRS. I don't dare try to use any 2m/70cm or GMRS radios inside the garage with the lights on. Power transformers are another source of noise if they are starting to go bad and/or have bad connections. Solar panels are another source of noise.

Here is the difference between the 2730A and 2730B for those interested.

It shouldn't be if they're still getting it with the engine off and just running off the battery. Could be some noise from lights tho, since seemingly every car turns the headlights on if you so much as walk too close to it

Hi I recently received my GMRS license and call sign, which was issued on 6/1/1/25. I am now trying to register on mygmrs.com to get the details to set up a repeater, and get the following message. "A license could not be found with the given callsign. If it was recently issued, it may not be available in our database yet. Please allow 24-48 hours after the Grant Date on your license before expecting to see your license here" My call sign is WSIR477, so not sure what is going on. It's been more than 48 hours, coudl it be that mygmrs.com just doesn't have my info yet, anything I can do to get this resolved? Thanks in advance for your help. Cheers, Robert

An old thread brought back from the dead. The 2730A is a nice radio. I do find that it does not do so well on GMRS with the MARS MOD compared to other modded/unlocked radios or Type 95 certified GMRS radios. I can highly suggest the 2730B with black screen over the 2730A with its white screen. The $50 difference is worth it. The 2730B screen is so much easier to see in bright sunlight and easier on the eyes at night.

More information will allow us to help you better. Noise can come from many sources. Alternators, spark plug wires. cheap LED lights, using an accessory port, wiring directly to the fuse panel, etc. The best way to connect any two way radio in vehicles is to run the radio's positive wire directly to the positive battery terminal while running the radio's ground wire to a chassis ground. You do not want to use the battery negative terminal, especially on newer vehicles equipped with battery management systems.

I may have mentioned this earlier in the thread... but I think the FCC is 40 years too late in approving FM on CB. I'm glad a manufacturer stepped up and got the change made, but it's just too late.

FM CB. FM. He said no one used FM CB. and he would be correct.

Hey- glad it helped! The Icom rig is super. Big display, compact sized faceplate, Chirp interface for programming. A lot to like!

yea, couple hours ago i was goinna take a drive by a couple cell towers to do close proximity test, but the damn beer won my attention

I remember those days, way back when. . My 70 Chevile played hell with my CB until i put in an electronic ignition

Cell phones work very well at -107dBm and OK at -115dBm and at -120dBm it's getting iffy. So a 50-60dB drop may not be enough in a lot of situations. But you'd have to be pretty close to the cell tower for it not to go below -120dBm in the bag. A -60dBm cell signal is usually right on top of the cell tower.

Well thought out

That's not 'feedback', its noise, or engine noise.. or, ignition noise.. Feedback is a whole 'nuther thing. what kind of car is it, does it have any LED lights, and how is the radio wired for power?