Questions tagged [mobile]

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

Filter by
Sorted by
Tagged with
3 votes
2 answers
205 views

Rfi in truck with HF transceiver when running

I have an Icom IC-707 in my truck, a 2003 F150, with a stainless 102 inch whip mag mount on the roof. It has a a coil pack 6 cylinder. Without it running I have no problem; as soon as I start the ...
Plumber90's user avatar
1 vote
2 answers
55 views

What are the considerations re installing an ID-4100 in a DIN slot in the dash?

I'm looking into installing my ID-4100a into the radio slot in my car. The radio and cassette player (lol yes really) are non-functional so I actually have 2 slots to play with. I haven't come across ...
webmarc's user avatar
  • 4,105
1 vote
1 answer
57 views

How to test real-world performance of a wifi and LTE IoT device

We're developing a product that communicates over wifi and LTE. I'm putting together a test plan for determining that these work, but also what sort of conditions we can expect them to work in. The ...
askvictor's user avatar
  • 191
2 votes
3 answers
468 views

Monopole antenna with no ground connection

I have a SDR device and have a question about using a monopole antenna with them, but the question could be applied to any device which uses an antenna. SDR comes prepacked with a monopole antenna ...
Dan's user avatar
  • 311
2 votes
1 answer
128 views

Converting an FM Antenna to a 2m/70cm Transmitting Antenna

I have a 2006 Honda Goldwing 1800 with an extra FM antenna that I would like to convert to a 2m (or 2m/70cm) transmitting antenna. Changing the connector to a PL-259 seems to be the easy part and I ...
Duane's user avatar
  • 21
0 votes
1 answer
121 views

How to create FM Radio Mesh

What (devices transmitters, receivers and transceiver) do i need to create a fm radio mesh, instead of using a single transmitter with big antenna, i want to build fm transceiver mesh radio to cover ...
Hither Joe's user avatar
5 votes
4 answers
374 views

UHF 70cm unlicensed use

We are farmers with (edit) 25-40w radios mostly old Kenwoods and Motorolas in all of our tractors and vehicles. I'm not exactly sure what frequency we have but the man who programmed them set them up ...
Logan's user avatar
  • 51
2 votes
2 answers
699 views

Do I need an antenna tuner for new mobile antenna

I am looking to buy my first mobile antenna, for use with a 2m/70cm HT in the car. The HT needs 50 Ω impedence. I was looking at this antenna, but another ham told me that I need 1/4 wave or 5/8 wave ...
TSG's user avatar
  • 259
3 votes
1 answer
68 views

Measuring effectiveness of vehicle bonding

Is there any objective way to measure the effectiveness of your bonding in a mobile HF setup? Or determining when you have "adequate" bonding? I have a hard time with just throwing straps on ...
Brad Mace's user avatar
  • 411
1 vote
3 answers
198 views

QRP CW on HF using FT-817ND - filter/dsp recommended?

I'm just getting into amateur radio, so just starting to gather the things I want/need. I'm only really interested in CW, and almost exclusively on HF. I'm looking into a mobile/portable setup which ...
upasaka's user avatar
  • 121
2 votes
1 answer
96 views

Looking for specifications for Wilson Electronics WAU 420 amplifier

Hey there helpful people I'm trying to track down some specifications on a Wilson Electronics WAU 420. I have no idea on its exact age but guessing its from the late 90's. It's likely UHF band and ...
Rowan Hawkins's user avatar
1 vote
2 answers
122 views

Sealing connection between mobile antenna and mount

I've got a brass mount installed on my car which has a 3/8-24 socket. All the antennas I'm looking at seem to have stainless steel connectors. Is packing the connection between antenna and mount with ...
Brad Mace's user avatar
  • 411
1 vote
3 answers
337 views

Ignition Static on 2m mobile but not 70cm

I have an ICOM 2730a 2m/440 mobile rig in a 2015 Ram 1500. Tx and Rx with truck not running is excellent. With engine running I hear static popping, but only on 2 meters. If I Tx I can hear the ...
PappyD's user avatar
  • 11
1 vote
2 answers
95 views

Adding radio to the car

I got an anytone 778uv that I want to add to my car. I'm looking at adding it with a add a fuse to an open fuse slot, however I see many people just saying to add it to a chassis bolt. I am new to ...
Brodisseius's user avatar
3 votes
2 answers
94 views

How to figure out my car battery's capacity?

I was participating in an emergency radio training and I was asked how long I could operate. I'm using an old car battery, which was sometimes not capable of starting the car in winter, which is why I ...
Thomas DK3TU's user avatar
1 vote
2 answers
131 views

Can a smartphone with single antenna receive signals modulated by different schemes

I am working on a system whereby a smartphone may receive signals simultaneously from different sources. As we know, the fading and pathloss will make the transmitters send their traffic with ...
Yukinari's user avatar
4 votes
1 answer
584 views

Boosting Mobile Phone Reception

Yes, I know, this could very well be a controversial topic, so feel free to close this off if you feel it's not a good fit for this site. That said, I'm posting it here because hams (and as a ...
Buck8pe's user avatar
  • 989
0 votes
1 answer
125 views

What type of Cable Should I use between a Long Wire antenna and a Transmatch?

I installed a Yaesu System 600with a MFJ Versatuner 2 on my 31ft sailboat and Idont know what type of cable should I use between the MFJ and the long wire antenna I have on my back Stay. Any ...
Fernando Villanueva's user avatar
3 votes
1 answer
489 views

Installing GNU radio on android

I want to install this miracle program on my smartphone in order to get more mobility. I found such a solution exists: https://github.com/bastibl/gnuradio-android However, I could not do everything as ...
Антон's user avatar
4 votes
3 answers
256 views

antenna coax feed-thru for a car roof

Newbie here, with a 2 meter mobile rig and a magnet-mount antenna. I am currently routing the coax out an almost-closed window and am tired of having rain water enter the car through it. Is there such ...
niels nielsen's user avatar
0 votes
1 answer
206 views

Hatch Mount Antenna Selection - Dual Band 2m/70cm

I just bought a Diamond CP-5NMO hatch/lip mount and intend to put it on the hatchback lip of our 2018 Subaru Forester and, if it will fit, another one on our 2019 Kia Niro EV. I understand that hatch ...
William's user avatar
  • 803
5 votes
1 answer
770 views

How does this W6NBC "derivative of the classical slot antenna" work?

Via the https://ham.stackexchange.com/a/9883/1362 answer regarding a slot antenna for a 2m mobile application, I was introduced to this (pdf) interesting antenna design: The designer John Portune (...
natevw - AF7TB's user avatar
4 votes
1 answer
937 views

DIY Triplexer for HF (low), 6m (med), and 2m/440 (high)

I'm looking at picking up the TYT TH-9800, which is a Quad-Band FM radio on 10m/6m/2m and 440 (I'm lucky enough to have some 6m and 10m repeaters in the area). I know there exists quad band antennas ...
Michael KC1MJP's user avatar
1 vote
3 answers
181 views

Need antenna for mobile mag-mount LPFM broadcast 88.3 MHz

I am doing some temporary FM broadcasting for car events such as COVID-safe car parades and drive-in movies. The terrain is horrible, urban areas with lots of buildings. The cars snake around a city, ...
John Tibie's user avatar
0 votes
2 answers
1k views

Yaesu FT-817 Won't transmit Dig, SSB or CW

I have a problem with my Yaesu FT-817 it Won't transmit Dig, SSB or CW, But it does transmit AM, FM and Pkt on all bands. Does anyone know what the problem might be. The Radio receives fine on all ...
sam kid's user avatar
4 votes
3 answers
660 views

Need batteries for backpack operation

I am building an HF backpack rig using an Icom IC-706MkIIG with a Opek HVT-400B antenna. The specifications on the radio say 20 A draw at high power, so what size and type batteries would be suitable ...
Steven Donnell KG5GRI's user avatar
2 votes
1 answer
698 views

144/430 MHz antenna on 155 MHz?

We have a local radio shop that started selling us Relm P150s with a high gain 9 inch antenna, and those are ok. He also has thrown in longer 15 to 14 inch dual band antennas saying use those in ...
Dean M.'s user avatar
  • 21
3 votes
2 answers
3k views

Can Yaesu FT-65 be charged from a 12 VDC automotive accessory outlet?

I recently purchased a Yaesu FT-65 handheld radio and quickly discovered it had no 12 VDC power port like other handheld radios I've seen. The charging cradle uses a 12 VDC wall wart for power, and ...
MacGuffin's user avatar
  • 359
1 vote
2 answers
1k views

GMRS not transmitting within a half mile

I recently got my GMRS license from the FCC, and I wanted to try out a couple radios for hiking and emergency communication. I have two tenway UV-5R pro radios (these do have an FCC ID) that are set ...
user16052's user avatar
1 vote
1 answer
147 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 ...
Zeiss Ikon's user avatar
  • 4,097
1 vote
2 answers
145 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 ...
Will Freeman's user avatar
5 votes
2 answers
213 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 ...
Danny's user avatar
  • 87
4 votes
4 answers
499 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 ...
Chris K8NVH's user avatar
  • 1,042
2 votes
2 answers
641 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 ...
Zeiss Ikon's user avatar
  • 4,097
0 votes
2 answers
298 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), ...
KP4MCG's user avatar
  • 217
6 votes
3 answers
3k 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 ...
hotpaw2's user avatar
  • 13.3k
0 votes
1 answer
288 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 ...
Synaps3's user avatar
  • 425
1 vote
1 answer
119 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 ...
Matthew Wang's user avatar
1 vote
1 answer
405 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 ...
user3791830's user avatar
2 votes
1 answer
1k 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 ...
user avatar
2 votes
1 answer
378 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 ...
Ed Gillis's user avatar
1 vote
2 answers
163 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 ...
user11905's user avatar
3 votes
1 answer
1k 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 ...
user11905's user avatar
4 votes
7 answers
4k 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 ...
Omagasohe's user avatar
0 votes
2 answers
266 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 ...
Ozzy S's user avatar
  • 101
3 votes
3 answers
1k 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 ...
MrSchmuck's user avatar
3 votes
1 answer
3k 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/...
YetAnotherRandomUser's user avatar
6 votes
3 answers
744 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 ...
William's user avatar
  • 803
0 votes
2 answers
1k 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 ...
Pablo Fernandez's user avatar
5 votes
3 answers
1k 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 ...
Dominick Pastore's user avatar