Questions tagged [mobile]

Mobile operations (car, motorcycle, boat or other vehicle)

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1answer
48 views

New quad-band mobile receives while transmitting?

I've got a week-old TYT TH-9800, a quad-band (10/6/2/70cm) mobile, Chinese knock-off of a Yaesu HT-8900. So far, I love it -- several times the power of my HT, and a better antenna actually outside ...
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2answers
90 views

Audio being sent over ground pin on audio jack

I just bought a QYT KT-8900D mobile radio. One of the first things I've noticed is that I cannot use my mixer to completely lower the volume of the radio's 3.5mm TRRS output. When the fader is all the ...
5
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2answers
72 views

Better SWR bandwidth

Good day, I have a Kenwood TS-480HT with a Wolfriver coil and a stainless steel whip in my car. I find that on 40 meters I can get the SWR at around 1.4 (using an MFJ 269) at 7.1000 MHz. But the SWR ...
3
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4answers
178 views

NMO bicycle mount antenna has unexpected SWR

I built a bicycle antenna mount featuring an NMO connector to allow quick changes. With a 2m 1/4 wave monopole it gives reasonable SWR results (1.4 or so in the band of interest), with a particular ...
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2answers
62 views

How to log contacts when mobile?

I'm just about to get on the air for the first time as a ham. It's been my understanding that it's good to log contacts with call sign, frequency, signal quality, and time of contact. However, for ...
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2answers
66 views

Proper magnetic mount placement on roof

I have a Nissan Versa 2012 (hatchback). It comes with one of those default antennas at the back/center of the roof, for listening to AM/FM radio stations. I have a dual band mag-mount (TRAM 1185), ...
5
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3answers
241 views

antenna in the rain

What kind of changes can be expected in the behavior (resonance, SWR, etc.) of a mobile vertical HF antenna between dry conditions and wet rainy weather? (assume a coax feed-line and low SWR in dry ...
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1answer
78 views

6 meter mobile antenna grounding

So I've been looking at my different options for 6 meter mobile antennas. My question mainly pertains to grounding. I've heard hams talk about needing a ground to the frame of the vehicle when using ...
1
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1answer
73 views

Mobile VHF/UHF antenna coupling to surrounding objects?

Will a mobile antenna --either mag mount or NMO mount-- couple to surrounding objects such as tall trees, taller trucks, buses, or even people walking by? If that is the case, would you get slightly ...
1
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1answer
97 views

Is it possible to make antenna for one specific frequency?

I have a GSM Modem that works on 2300MHz Frequency (LTE), but it could only receive 3 bar of signal strength. I plan to make a DIY directional antenna that is made specifically for this Frequency ...
2
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1answer
210 views

CB Radio Ground Plane (or lack thereof)

Notice the vertical antenna on the truck. I believe this first antenna is referred to as a "dipole", mounted vertically. CB to coax, coax to antenna. The shell of the truck is fiberglass. Even the ...
2
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1answer
94 views

ID5100 is a Speaker Mic avail?

ID5100 mounted mobile in center console with only faceplate and mic exposed. Also have bluetooth headset. Besides the speakers built-in and external sp1 or sp2 does a handheld mic AND speaker like on ...
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2answers
135 views

What wireless communication technologies can travel long distances with a high bandwidth?

I couldn’t find a better place to ask this question, so I have asked it here. I am looking to transmit and receive internet connectivity wirelessly over a distance of 6 miles (9.7 km) with a minimum ...
3
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1answer
343 views

What are the maximum possible speeds of download over Amateur Radio frequencies?

In this scenario, I would have a base station connected to a modem that essentially allows me to access the internet/local network via radio, irately I am not fully aware of what information I need to ...
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3answers
2k views

Slot antenna for 2 meter mobile

My primary vehicle is a Smart car, with a roof that's a piece of plastic(100% moon roof). Not the most awesome of cars to use for grounds. I'm building a bumper mounted antenna tower, EMT with some ...
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2answers
128 views

Console vs Trunk mount

A little background - I own a 2012 Dodge Charger Pursuit that I am turning into my mobile ham station. It already has most of what I need, but I ran into something I want to ask a question about. It ...
2
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2answers
284 views

Baofeng radio produces hum when plugged into charger

So I am working on a low cost ham radio beacon using my Baofeng UV-5R radio because it is easy to use and portable. I built a simple PTT interface for a Raspberry Pi and wrote some python to transmit ...
3
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1answer
1k views

Is Part 90 certification something an amateur radio operator should look for in a radio meant for amateur use?

I'm checking out cheap (~$100) mobile radios on Amazon, and often times there's a question asking about FFC Part 90 certification. As an amateur radio operator looking to use a radio for amateur/...
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3answers
266 views

Is there a special term for amateur transceiver speakers or anything that makes them different from any other kind of speaker?

When I bought a secondhand FT-7800R at Field Day 2017, I received an MLS-100 external speaker with it. I installed it recently and having the speaker more than an inch away from the radio's mounting ...
0
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2answers
478 views

Do the radials of a quarter or 5/8 wavelength antennas connect to the braid of the coaxial cable?

I'm studying for my foundation license (in the UK) and I have these diagrams: Do the radials in a quarter or 5/8 wavelength antennas connect to the braid/shield of the coaxial cable? If so, how does ...
3
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2answers
344 views

Noticeable difference between trunk and roof mount?

Between trunk-mounting and roof-mounting a 2m/70cm antenna, both as through-hole NMO mounts, is there really that big a difference performance-wise? I mean, I know roof mounting is better, but let's ...
2
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1answer
288 views

What size is the Kenwood TM-D710 panel mounting bracket?

For the purposes of this question, I am considering purchasing a Kenwood TM-D710GA (or a RC-D710). The control panel has a mounting bracket for mobile use which is intended to be attached to a flat ...
5
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3answers
550 views

Tiger Tail + capacitive coupling… what's the interaction?

I've been working on a 2m setup for hiking. My goal is to have the best possible antenna that can be used while walking, and that won't get damaged if I walk under a low branch or some other forest ...
2
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0answers
429 views

Direction Finder using directional antenna, digital signals amid clutter [closed]

There are several methods for implementing direction finder. 1. One of the method is by using directional antenna pointing to target device, and reading the received signal strength from the target ...
0
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1answer
95 views

RF connector between mobile phone and transmitter = complete shielding?

When connecting mobile to transmitter with RF cable: Does RF connector provide complete shielding for the transmitter signal ? Does it prevent the mobile from receiving other signals from other ...
3
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2answers
691 views

Are chokes necessary for VHF and higher frequencies?

I am trying to install a VHF/UHF antenna on my truck, and I have been studying everything I need to do that. I keep reading about chokes, in particular here: http://www.k0bg.com/choke.html However, ...
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3answers
237 views

How do you keep your vehicle clean with a mobile antenna?

I want to add a V/U antenna to my truck, but my wife started asking about weather proofing and car washes and I had no answer. How do you keep your vehicle clean after installing a new antenna, and ...
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3answers
341 views

High SWR on a Jeep with Spare Tire Mount

I just installed a spare-tire mount and Browning BR-180 dual band antenna on my Jeep JK. Initial SWR testing show nothing higher than 1.4:1 across both bands so I didn't try to tweak it. Then I put ...
4
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1answer
367 views

What are the best APRS SmartBeaconing™ settings for different modes of transit?

There are a variety of websites that give sample SmartBeaconing™ settings – mostly for automobiles, but some for bicycles and pedestrians. I've tried several of these settings and had mixed results. ...
7
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4answers
688 views

How would you get an “I'm alive” message to family in another state using amateur radio?

I'm researching options for getting an "I'm alive" message during a disaster response out to family in another state that aren't HAMs. There are likely to be a lot of possible answers that are art ...
0
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2answers
3k views

Motorola Maxtrac Programming with windows 7 and DOSBox

I found an old Motorola Maxtrac in a parts truck I bought. I'd like to program some channels into it with a Windows 7 computer and DOSbox. My first issue, is I'm having trouble identifying the radio ...
5
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1answer
329 views

How can I counter DC-DC inverter noise / ground noise in an electric-vehicle mobile setup?

So, I'm relatively new to all this; and I've gotten an ICOM IC-7100 on sale, which looks like an excellent transceiver … unfortunately, this very specific line shows up in the manual: The ...
5
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3answers
386 views

Mounting my antenna

I just bought a CB and mounted it in my truck. I ran my antenna to the back and was going to stick it to my tool box but it turns out to be aluminum, so I'm thinking of bolting a metal plate to the ...
1
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2answers
569 views

Mobile Installation in 2016 Chevy Cruze

I purchased a Yaesu FT2900,a mobile antenna and mount. The install question is for a 2016 Chevy Cruze. Is there an easy way to run the power cables from rear of radio to the forward engine ...
1
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1answer
108 views

Connecting radio in parallel with inverter in mobile set up

I've just added a leisure battery, split relay and circuit swap loom to a newly acquired Mazda Bongo. Also added was a 1000W pure sine wave inverter, hooked up directly to the leisure battery. That's ...
5
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2answers
192 views

Amateur Radio for a Nomad [duplicate]

I got my amateur license back in the early '80s, primarily for putting it on my resume for an electronics job. Never used it outside of developing my Morse code speed, and once I got my Advanced Class ...
1
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2answers
517 views

Airband VHF antenna challenge

I have a very difficult antenna design/installation challenge. I need to install an VHF antenna (118 to 140 MHz) into a nearly all carbon fiber glider. The radio provides 5 watts and 50 ohm, and most ...
3
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2answers
993 views

What is the minimum length antenna I can use with my vehicle setup?

Devices I need to hook up to roof-mounted antennas in my truck. Scanner - 25Mhz-800Mhz (mostly listen to FD/EMS on 2m and 70cm) Handheld HAM (possibly upgrading to mobile unit) - 2m/70cm ...
0
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4answers
2k views

In Vehicle Mounting recommendations

Just looking for some general advice for in-car radio mounting. In my previous vehicle (06' Ford focus ZX3), I simply screwed the metal brackets into the dash which worked fine for an old beater car. ...
3
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2answers
399 views

2 meter dipole of work vehicle

I am about to purchase a Baofeng HT. I have one I am thinking of using primarily in work truck. I can't really drill holes or have antenna be too obvious. On Amazon I found a 2 meter 70cm 2m dipole....
0
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1answer
1k views

Frequencies as 5 digits and 6 or 7 digits

Why are some frequencies 5 digits like 51344 and some six or seven digits long like 158.7600?
8
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2answers
159 views

Can cellular radio be used for communication with a balloon?

(Sorry, I don't know if this is the right forum for this question, but maybe someone will know the answer. If not, which StackExchange forum could be more suitable?) Me and a few friends of mine are ...
2
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2answers
156 views

Ham Variable Lab Power Supply

I'm looking into purchasing a mobile radio (TYT TH-9800) for my Jeep Wrangler. I am hoping to be able to use it in my apartment as well. Since I'm going to need a power supply for this, I think it ...
2
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2answers
1k views

Smallest / Thinnest UHF/VHF Mobile Transceiver under $100

I'm looking for the smallest/thinnest UHF or VHF two-way radio under $100. So far I've found: Baofeng/Pofung UV-5R (current solution) Baofeng/Pofung BF-888S (102m x 51mm x 11.35mm) KST K-888 (122mm x ...
2
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2answers
150 views

Can RF work while it's in motion?

I have a project idea. It uses a pair of RF transmitter and receiver. The application is a little complicated since it involves motion, typically the speed of a vehicle going on local or even better ...
3
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1answer
79 views

What's the general difference between radiation patterns of stationary and adaptive aerials in mobile communication systems?

I am trying to find general difference between radiation patterns of adaptive and stationary antennas (common difference, calculation difference and any other). I am interesting in any example and ...
9
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3answers
11k views

Should I ground my radio to the chassis or battery for a mobile install?

From what I've seen, there are generally two ways to power a mobile radio: Positive lead to battery, negative lead grounded to chassis Both positive and negative leads to battery I know that ...
5
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1answer
124 views

OK for S/RF light to be illuminated at engine idle?

I just installed a mobile CB (Uniden) into my Jeep. When the key is in auxiliary (car off, accessories on) and the squelch turned all the way down, no S/RF lights are illuminated and the background ...
3
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3answers
953 views

What should I look for in a modern portable shortwave radio?

I'm looking to buy a shortwave to listen to either solely at home or perhaps if possible in a vehicle when traveling. What should I look for when looking them over? I recall many years ago the ...
4
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2answers
399 views

How should I mount a mobile antenna on a vehicle with a non-conductive body?

I would like to mount a self tuning antenna, ATAS-120, matched with the FT-857D transceiver. I would like to make this pair function on an ARGO 8x8 amphibious vehicle with a polyethylene body. There ...