kidphc
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Posts posted by kidphc
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For my 70cm gmrs hts. I usually use what is supplied with them. Aka my motorola xts5ks.
For my ham radios (2m/70cm/aprs and gmrs) I have found stocks antennas are ok. But the stock rubber duck antennas did the best job trying go across such a wide bandwidth. Even the signal stick was barely an improvement on the 878uv, caused intermod issued with the Feng bf8hp for me at least.
For my gmrs hts I usually swap them for Nagoya 701c and they perform admirably.
The harris xg100m. The long high gain antenna works the best. It's tri band and is adequate.
Real short, stock rubber ducks work fine. If it is a gmrs specific ht. I found the Nagoya 701c a good antenna.
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There are some videos on youtube. Which are really good at teaching things like programming p25 in astro25.Thanks for the edumentation. How do I learn all these fancy P25 programming tricks? Is there a P25 guru that can train or just use my brain and click around and learn from my mistakes, which I am good at making.
You are going to want to narrow down your radio choices first. Each software is different and has different quirks.
Generally, they program similarly to any other radio. Just with different terms for the same thing.
Unfortunately some software like Harris rpm. There aren't videos, they kinda expect you to already know or attend harris training. Then it's a matter of playing with the software and figuring it out. For Kenwood, you have Lscott
I for the most part think the Motorola software is one of the easiest, since it's straight forward, well for me at least. F harris.. nac code says its hex in software , but it isn't actually using hex its decimal...lol
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Stand corrected then.Incorrect. The Motorolas can do "ADP" encryption which does not require a key-loader.. ADP is not as strong as AES256 (which does require a key-loader), but it is MORE than good-enough for anyone not transmitting state-secrets or plotting another unplanned group-tour of The Capitol.
I don't load encryption keys on my radios. All my hexedits and feature additions are done by handful of friends. They are the ones that actually know the intricacies.
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Real high level.I like radios. Always have. Will spend hours pecking away at my phone on this website because of it. I own a business and the idea of encrypted digital voice or at least digital voice alone (DMR) with a repeater on the building, a mobile in the truck and PERHAPS a couple of handhelds would be pretty neat. I'm learning from you all if/how to best do this.
Digital interests me because most people (maybe I'm wrong on this) listening on their analog only radios will only hear the machine gun buzz of a digital transmission, which I like the idea of.
But I also like listening to the analog frequencies as well, so that's why I have a cheap dual band mobile at my disposal.
I know very little about the intricacies of P25 vs DMR vs YSF vs WIRESX so that's why I'm here asking questions.
This might turn into a boxers vs briefs or Chevy vs Ford answer, but is one digital voice mode more user friendly and easier to program/obtain/work with, than another?
Dmr = mototurbo timeslot digital (one of the better option for businesses requiring encryption. No encryption for amateur usage but encryption is ok for lmr usage
Ysf = yeasu fusion proprietary c4fm digital. Negative it is only available to yeasu radios in native format. No encryption allowed.
Wirex = ysf with internet connectivity
Apco p25= c4fm (not the same as ysf and not compatible, but same technology) standardized for public safety. This can be analog. It can also be conventional p25 (used in simplex/with a repeater). Trunked you have a control frequency that tells the radios what frequency and talkgroup that can be used. It usually requires multiple frequencies.
Benefit with digital with encryption. Is even if someone has the equipment, and the frequency and all the settings. That theu can't listen onto encrypted channels without the keys. It does require additional cost with a xtl5k/xts5k you will need a key loader like a motorola kvl, the cables and keys and entitlement enabled.
Analog is always easier to work on then digital and usually cheaper.
Pic of a buddies kvl3000 I was working. Attached below.http://files.mygmrs.com/forums/monthly_2024_04/FB_IMG_1713707770436.thumb.jpg.10a150798755507a315db1f20c958a8a.jpg
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It's single banded. Vhf, uhf r1, uhf r2.. etc.If I recall tree last time I was on the fcc website I had thoughts of monkeys doing things to footballs.
I'll give it the old college try to find a freq coordinator.
Does the xtl5000 have the capability to be used on multiple frequencies or does one only program it to the lmr frequency assigned to the business?
If you want to do say vhf and uhf. To stay motorola you will need to dual brick or pay for a relatively rare apx7500 vhf/uhf (only rare because a majority are set to 700/800 and r2/r1.) Or even an apx8500.
Hence why I ended up buying a xg100m. 2m,70cm, 7/800 and vhf low (not really usable though).
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You don't really pay all that much to the fcc.
Now the local frequency coordinator. He's going to rob,rape and pillage you.
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You won't unless they have the same tone.Heres a dumb question. If I transmit on channel X with CTCSS turned on , How will I know if I someone else is
or is not talking on that channel that is not using a CTCSS tone ?
Locally we suggest all people enable/program a monitor button if out radio has that feature...
Then monitor for about 30sec to a minute before transmitting.
On repeater pairs a lot of have no receive ton on the receive side. I don't do this because I don't want to hear all the kids and lawn mor companies stopping my repeater scan. So generally, before transmitting on a repeater pair I hit the monitor button on my xtl5k or xg100m and I removes the tones for the receive side. It's helpful for some one whom might be close on simplex but can be heard by the repeater for one reason or another (usually wrong tone or dont even have one set) but can hear our conversation on the repeater output.
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It can help and hurt.
Most springs are calculate into the length of the radiating (active) length of the antenna.
For instance, the comet 2x4sr (think this post is the one you are referring to) is about the same length as the section that is removed to install it. It would not affect anything. You can actually tune the antenna by unlocking the allen grub screws and increase or decrease the length of the antenna smidgen. But because of it being a collimeter design it can be a bit tricky to do right.
Which is unlike cb antenna steel whips. Which are technically too short, most commercial whips are about 102". By adding the 6" spring to the base it brings it closer to the natural resonance length. Give or take with spring it's 108". Resonance is about 108-112" (true 1/4 length) for 11mhz/cb.
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It will work just not well.
It's just a really kinda compromised antenna. 2m-70cm and gmrs is a real big stretch, bandwidth wise.
So the swr values I got it was close to 2.1-2.5 give or take swr on the gmrs repeater. Some got lower swr, but my ditch light mount where the antenna is located is a compromise location. So take it with a grain of salt.
It heard gmrs better then my Larson 270. But the Larsen is up on the car.
Why?
Well the Larsen is extremely flexible and can/has taken a beating.
Some con with the 2x4sr. One it is thick (how it gets its bandwidth), tall and stiff. The other con is the hinge (mine started to loosen up in about a months time) as well as I found water starting to go through to the coil.
If you do get it expensive. The spring (Highly recommend it) adds cost and isn't included. Mine at least whacked everything. The thickness a benefit to bandwidth, made my antenna move way to much. It rocked the mount violently with every bump, one of the main reasons I went back to the Larsen.
In short if you don't need to have 2m/70cm you are better off with a dedicated gmrs 5/8th over 5/8th antenna.
Sorry for the long winded post.
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Sadly. Don't use the repeater is the answer.
The only way to stop a tone decoder is to not have transmissions with the tone encoded.
Hell we have one local guy, sits in a tow truck between calls and tries to find repeaters. He is proud of finding hidden repeaters. He has every tone programmed on every repeater pair. Basically tried to brute force method to find repeaters. He gets a repeater tail and he is happy.
Just be prepared to change tones if someone starts interfering.
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Yes, you are over thinking it.Good day all! I am brand new to GMRS and have ordered a Midland MXT 500 GMRS radio with a Midland MXT 26 Mag-Mount antenna for the roof of my Hyundai Tuscon. I have seen many videos regarding "RF Ground" and "DC Ground". One video in particular has stated that it would be very beneficial to attach a ground wire to the srew-on base of the mag-mount and screw the antenna on to the base. Then, take the ground wire and attach it to the chassis of the vehicle to provide a better ground situation. Am I over-thinking all of this or does this make sense? If the magnet to roof top alone will do the job, then I will live with that. Thanks to all for helping out the new kid on the block.
Dan, WSBV762
The mag mount should provide enough capacitance. Provided there is enough sheet below it.
Even in hf, you would be better served by grounding chassis component of the car over going through the antenna mount.
Mainly due to the wavelength in hf. Think meters to tens of meters to hundreds of meters for one full sine of rf wave.
Gmrs is only going to need a disk roughly 9 inches in diameter. To accomplish the same.
Stick the magnet on the center of the roof and enjoy.
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Not sure if that is possible. I haven't seen any network talkgroup ids that are linked. Plus it's not in the same service, so what are the legal ramifications?Anybody know if a DVmega Pi3 or ZUMspot elite 3.5 can be programmed to connect to GMRS live?
Thanks, Rick
Would this be a violation (maybe multi violation)? I mean cross repeating two separate radio services? You know gmrs radio transmissions to an ip network over to an amateur ip network, then over to potentially retransmitted to amateur frequencies on a hotspot?
God my head hurts thinking about it.
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Agreed. But it's expensive for a mobileIt is as much as a radio, but in my experience antenna>radio. I’ll actually spend more money on antennas and have less expensive radios.
antenna
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I have done a little research. Not a huge amount. Mainly because I thought I could do ham, lmr and gmrs on the same antenna. Which you can't i would have to buy ham antenna, lmr/gmrs antenna. Which would have been $$$.I've been doing some looking into this antenna. The creator of it claims that it's predicated on a fundamentally different method of antenna science. I'm not in as deep with antenna science as some are, but it has to do magnetic field resonance, making use of variable polarities, and not just the electric/vertical polarity like typical mobile verticals do.
The claim being made by the creator is that not only is this antenna a smaller form factor, but it's actually superior. It'll provide a more stable and readable signal in areas where conventional antennas will flutter, drop, etc. Because the gaps get filled by angular/horizontal polarities and the magnetic portion of the signal carrier. Or something to that effect. It's claimed that this antenna (the 2m/70cm version) can work the ISS while driving and not having to change the orientation of the antenna. Again, because of the use of variable polarities..
Is it snake oil?
It's a $200 antenna for the version needed on GMRS. If it does what it says, I've got no problem paying that. But does it?
Just curious if anyone here has had any time with one...
It uses what looks foil like flaps arranged in a circular pattern with dielectric material between the flaps. So it looks like it creates a circular polarization pattern, great for fm radio and satellite comms.
Although I am really skeptical about some of his claims. Josh from ham radio crash course did a comparison of it to some tried and true dual-band mobile antennas. It in fact did seem to reach out and hear better than most of the whip style.
I have no experience with it.
Why didn't I plunk monet down on it?
1. I needed flexible antennas. Parking garages and trees. That antenna is a rigid tube.
2. Couldn't tune the damn thing. Not a deal breaker if done properly from the factory. But i like tuning mine and being able to get replacement parts cheaply.
Guess if you really want to know you will have to whack the crap out of your credit card. Personally, that is almost as much money as used Motorola mobile or mid tier to high-end radio.
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Yeasu's hf mobile motorized screwdriver. Works directly with the likes of a ft891,817,ft991a without the need for a controller.I don't know anything about that antenna. However, I have a MARS-modded Yaesu 6000r and it pairs wonderfully with my Tram 1181 on 2m, 70cm, and GMRS, without adjustments.
Gets shit on a lot due to weather seal issues, motor issues and missing features of its competitors. Frankly, you cant compare it to the competitors. Simply because even a baby tarheel is going to start at 350 or so, then if you want memory for the different bands, almost as much as the antenna a quality controller. Then there are the scorpions, easily 3x the atas cost for the screwdriver alone.
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Do you hear a repeater tail after you key up?
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Legally/technically.. you would need a FCC approved device for each service.You would be able to use the radio legally on the frequencies it is made for.
1 radio for gmrs/frs
1 radio for amateur uhf/vhf
1 radio for amateur hf ( they have base stations that do 2m/70cm and hf)
1 radio for cb
1 radio for public safety 700-800
Yada yada and so on.
Fun part most antennas can't do multi services well either.
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No.If I get my ham license then would this radio work on all networks?
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Whatever antenna you choose. You are going to want it roughly 100 feet up.I live deep in cove with mountains on 3 sides, but I do have 90 degree and 20-25 mile line of sight to the S/SW. There are two repeaters in that direction that I want to try to reach. Any suggestions on antenna? Planning to purchase a 50 watt mobile for my base. Thanks!
Make sure there is nothing in the way, you will want to try to clear as many trees, hills and buildings. The less obstructions the better you are. Really helps if the repeater antenna is just as high or if not higher.
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Gmrs is 462-472 mhz.. so yes unless you mod the radio all you can do is listen to the gmrs bands.
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Don't think by default the 60re can transmit on gmrs.Bought a yaesu 60 r/e bought the program for it did everything it said. Sometimes I can hear others while scanning through but it seems no one can hear me at all. What am I doing wrong? Super new to all this just got FCC license.
Not at least without a cap mod.
Since it is amateur radio ht. Not a gmrs ht.
EDIT: yup just confirmed transmit is 430-450 uhf and 144-148 vhf. Ham 2m and 70cm bands.
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Could try a piece of vinyl wrap.What material can I place under a magnetic antenna mount to limit damage to vehicle paint while maintaining a strong enough magnetic force to prevent antenna movement?
Apply to the area on the car. Then place mag mount on it.
Damn I wish I had tried it on the burb.
The mag mount left a rust spot on the roof. It attracted iron from the debris on the road and that started to rust. Remeber dirt has iron in it. Don't believe me go grab a magnet and rub it on some dirt.
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GMRS/WiFi Backup Camera signal interference
in Technical Discussion
Posted
Shouldn't 2 different frequency segments. Guess you are going to have to send it and find out.
But not 100% since non adjacent frequencies can still wipe each other out with enough power, suppression of harmonics. Especially, with antennas less then 1/2 wave length away (longest wavelength/ frequency).
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