Questions tagged [2m-band]

Use this tag for questions relating specifically to the amateur radio VHF allocation around 144 MHz.

2
votes
2answers
87 views

Is there a trick for reaching a repeater “through” terrain?

I live in a draw, well below local average ground level. There are two repeaters I want to be able to use (because they're in the network my club uses). One is in the 440 band, thirty miles away but ...
0
votes
2answers
59 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), ...
2
votes
2answers
152 views

Amateur Radio for Science Fair

Can I use an amateur radio for a science fair? If so, do I need to prove that I have an active license?
1
vote
1answer
383 views

Using a Baofeng UV-5R V2+ as a Portable Packet Radio

So my idea is I might use a keyboard to enter text. I would use an Arduino to control the ham radio. The problem is that I have no idea on how to use the Arduino to control the radio. Also, what ...
6
votes
1answer
138 views

Two antennas on different sides of a building

I live in the 4th floor of a building with one side facing south and the other north. I am able to use my 2M mobile base transceiver with a mobile magnet mount antenna placed just outside the window. ...
2
votes
1answer
183 views

APRS - using 100 Hz CTCSS for voice contacts

I've learned online some very thin information about how many hams will use 100 Hz CTCSS tones on their APRS transceivers to be able to make voice contacts with hams who are also using APRS. I've ...
5
votes
3answers
938 views

Why are 2m and 70cm the common frequencies on HTs?

Why do most HTs have 2m and 70cm as the two bands? Is it just out of history or tradition, licensing restrictions, or is there something in the transceiver or antenna design that would make these the ...
2
votes
1answer
78 views

Are any handsets compliant with Canadian regs usable on both 2M amateur and 2M commercial bands? Is this even possible?

It is rumoured that radio handsets are sometimes used in Canada on 2-metre amateur bands without being certified with Industry Canada. Some of those sets may be modified or reprogrammed to operate on ...
2
votes
4answers
2k views

If i connect two antennas to one radio using a t connector will it work?

If I connect two antennas to one radio using a t connector will it work? If a connect 2 antennas (a mag mount + a dipole?) to the same radio with an adapter will it work normally on 2M band and will ...
0
votes
2answers
203 views

How to design a meander antenna for 2 meter band?

How should I start if I want to design a compact antenna for 2 meter band using the principle of meander antenna? I noticed meander antennas are frequently used in mobile devices and notebooks for 2.4 ...
0
votes
2answers
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 ...
5
votes
1answer
269 views

HF/VHF antenna for high altitude balloon

I'm working on the design of a dual band transmitter for use on a high altitude balloon. I'll be transmitting on 2 meters and 20 meters (APRS and WSPR) with about 50 mW. To keep the weight to an ...
5
votes
2answers
450 views

How to adapt commercial VHF yagi for 2 meter amateur use?

I recently acquired a Decibel 3-element VHF Yagi that was formerly in commercial service. I connected my MFJ-259B antenna analyzer to the antenna and found its minimum SWR at 155 MHz. I have not ...
2
votes
1answer
174 views

Yaesu FTM-3200dr Antenna

I am looking to upgrade my station soon by buying a Yaesu FTM-3200dr mobile 2m radio. I am limited on funds for radio and I don't want to get the wrong type of antenna connector and wast a bunch of ...
0
votes
4answers
987 views

Good Hidden Antenna For 2m

I would like to have an antenna outside for 2 meter VHF use but I do not want it to be expensive and I won't be allowed to put it up if it stands out too much. Does anyone know a good antenna to buy ...
2
votes
1answer
555 views

Dual-band rubber duck gain on 2m vs. 70cm

Using a dual band "rubber duck" like the stock Baofeng antenna and/or the physically longer NA-771, which band will give the best results between two mountain tops given the same input power? ...
3
votes
3answers
3k views

How do I construct the driven element of a yagi?

I've been poking around the internet on how to make a Yagi for my HT. I understand all the math for cutting directors and reflectors to length and placing them at the correct spacing for 146.52 mHz. ...
2
votes
1answer
364 views

Horizontal dipole radiation gaps

Consider the radiation pattern of a horizontal dipole mounted at a height of 1.75λ. Is it possible for a receiving station's antenna to be mounted at a certain height such that the radiation of the ...
2
votes
2answers
3k views

2 Meter horizontal or vertical dipole polarization?

When should I use one polarization over the other on 2 meters? I've looked at the radiation patterns for horizontal dipole and seen how it changes based on mounting height. I haven't been able to ...
5
votes
3answers
730 views

What is the minimum signal strength I need to receive?

Let's say a transmitting station is using a 8W radio with a J pole antenna. The cable connecting the radio to the antenna is RG-58A/U and is 25ft long. At 144.075MHz, the attenuation of the cable is ...
2
votes
1answer
427 views

Is it possible to determine if I'm adjusting gamma match in correct direction with an SWR meter and if yes, how?

I've recently obtained a Quad Loop antenna for 2 m and 70 cm that's fed through gamma match, as shown in the picture: The shorter metal bars are connected to the hot side of the BNC, while the longer ...
3
votes
2answers
143 views

Can I leave voice messages via Echolink using my 2-meter handheld?

I am (KB3IFP) going on a 400 mile bike ride in the middle of West Virgina with 0 access to cell reception. I have a 2 meter handheld and a small book of all the US repeaters. I like to 'check-in' ...
3
votes
3answers
1k views

Is the National Calling Frequency actually used?

I know that the national calling frequency is 146.520. Everywhere I go, it does not give a DUP or TSQ. I am not trying to be or, ask a crazy question but is there or not.
2
votes
2answers
622 views

Website for satellite down/uplink frequncies and live footprint?

I am looking for a website that has the satellite footprint as well as the downlink freq. I just got a 2m/70cm handheld and want to see what I can pick up.
3
votes
1answer
183 views

Rhombic Polarization Question, provided radiation maps

I am trying to engineer my first antenna to get on the air. I need to hit a repeater 50 miles away at a lower elevation than me so that I can use its IRLP nodes. Would this mean I am looking for low ...
3
votes
2answers
551 views

2 antennas and 2 amplifiers connected to same exciter radio

Does anyone here have experience connecting one exciter radio to a pair of identical amplifiers each connected to identical cables connected to identical antennas? Let's suppose we are talking about ...
9
votes
6answers
1k views

While backpacking, is it worth mounting the antenna to the backpack frame (above my head)?

I am planning a trip with a large group in 6 weeks. We will be spread out in small groups on a trail in a mostly desert plateau landscape perhaps 5 miles apart, but mostly in a straight line. I'm new ...
3
votes
2answers
129 views

Why is 2 meter pre-programed?

When I tried to enter frequencies in my 2 meter YAESU, it was already programmed for 144.000 MHz as the primary. WHY?
2
votes
1answer
1k views

Radiation pattern for a 1/4th wave 2 meter antenna used on 70cm

What would the radiation pattern look like if I used a 1/4th wave 2 meter mag-mount antenna on 70cm with an HT.
3
votes
2answers
261 views

Is it legal to put IRLP on a 2 meter repeater?

I heard that it is illegal to put IRLP linking onto a repeater on 2 meters in the USA. I was wondering if this was actually the case.
7
votes
2answers
488 views

Getting Started with Digital Modes on VHF on Linux

I am interested in learning about digital modes using 2m and Linux. I have a couple of older 2m rigs (HTX-212 and an old Yaesu) with no additional hardware, like a TNC. What current resources exist ...
3
votes
2answers
894 views

2m Homebrew Receiver - Chip for frequency [closed]

I am a new HAM trying to design a small, cheap 2m receiver. I've been looking up different circuits and homebrew tutorials, but the closest I seem to find to what I'm looking for seems to always use ...
8
votes
2answers
3k views

Is there an optimum Antenna Feedline Length for mobile installations?

I bought a ham radio antenna mounting kit for my car that includes ~16' of coax. One end has a trunk lip NMO antenna mount, the other end has a re-solderable PL-259. I asked the sales person if it is ...
2
votes
1answer
3k views

What is the theoretical performance of a 2m 1/4 wave ground plane antenna when used at 70cm?

If I have a 2-meter 1/4 wave ground plane antenna with 1/4 wave radials bent down at approximately 45 degrees, what kind of performance in terms of SWR and gain pattern can I expect when using it on ...
1
vote
2answers
561 views

What is the essential gear to have in a VHF/UHF FM base station? [closed]

I'm trying to assemble a VHF/UHF FM base-station at home. Assuming I have the following pieces of equipment: VHF/UHF FM transceiver power supply - 30 amps, no meters antenna that's resonant on 2m and ...
31
votes
4answers
25k views

What's the difference between national calling frequency and national simplex calling frequency in the 2m and 70cm band plans published by ARRL?

On the 2 meter and 70 centimeter band plans published by the ARRL, what is the difference in intended use between the calling frequencies (144.200, 432.10 MHz) and the simplex calling frequencies (146....
2
votes
1answer
331 views

Practical antenna for 2m line-of-sight over 7 km [closed]

I live 7.8 kilometers birds eye view from my friends house. We are in Denver, so there may be a bit of terrain but should be relatively flat. There are a few trees, and houses and maybe a few ...