Questions tagged [transceiver]

Use this tag for general questions relating to transceivers.

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14
votes
3answers
2k views

WWV, WWVH, and WWVL may be shut down. Are there any alternatives?

The US government is proposing to shut down the NIST standard time and frequency stations WWV, WWVH, and WWVB in Colorado and Hawaii. If that actually happens, are there any free or inexpensive ...
13
votes
1answer
3k views

Is it a good idea to build your own radio transceiver today? [closed]

With all the advances in the field of electronics, microcontrollers, etc., is it a good option today to build my own amateur radio transceiver (or transmitter/receiver)? Why might one choose to build ...
10
votes
1answer
11k views

What is a waterfall display?

High-end transceivers apparently come equipped with a water-fall display - something to do with improved spectrum visibility. This is supposed to lead to potentially higher QSO count and rate. What ...
10
votes
4answers
579 views

Why are commercial SDRs so limited in operating frequency?

I spent a bit of time researching SDRs, mostly looking into the possibility of building an all-FPGA-based TRX. There are a lot of commercial ready solutions; some are cheap, some not, but they all ...
10
votes
1answer
790 views

What does a lightning bolt symbol next to an antenna connector mean?

On the back of my Yaesu FT-897, next to each of the antenna connectors, there are lightning-bolt-ish symbols. What do these mean, and is there something I ought to be doing because of that? I have ...
9
votes
3answers
3k views

Why do so many HF transceivers use a UHF connector?

Just looking around at various rigs online for a fiend. Lots of them look really attractive TS-480, K2, K3, FT-450D, FT-950, IC-78, FT-897 to name just a few... These rigs are mostly HF, albeit some ...
8
votes
2answers
487 views

How is full duplex implemented without swamping the receive circuitry?

I've seen a few references to full duplex SDR radios, and I'm wondering how can one transmit and receive at the same time without overwhelming the receiver, and without heavy filtering such as the ...
8
votes
1answer
596 views

Antenna tuning while receiving

I've built AA5TB's antenna coupler for a 5W 20m transceiver. Tuning was kind of difficult because my transceiver has buttons for sending a dot and a dash, but no tuning mode, so I couldn't have the ...
7
votes
2answers
411 views

Why don't monolithic HF transceiver ICs exist?

HAM operators who build their own HF rigs typically do so using discrete components. However, for VHF and UHF rigs, an operator can make use of monolithic transceiver ICs on the market For example,...
6
votes
4answers
1k 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 ...
6
votes
1answer
308 views

How can I get started with a Home Brew QRP?

I want to build a simple 40 meter CW transmitter and Receiver pair. What should I do to get started into home-brew HF RF devices?
6
votes
3answers
5k views

Is there any PC remote control software for the Baofeng UV-5RE Plus?

I saw on YouTube that some software, with another brand transceiver, can command the transceiver to scan a range of frequencies and display a running waterfall display of scanned results. Can such a ...
5
votes
2answers
366 views

Share wide band antenna with multiple transceivers

I'm trying to incorporate several transceivers on my board design; I need WiFi (2.4 GHz) SatCom (~1.6 GHz) RF (~900 MHz) and GNSS (~1.5 GHz). I need to combine them into one antenna. I found a wide ...
5
votes
2answers
872 views

World wide Radio Module

currently I am involved in a project were a data link is needed to communicate different devices. This is in one to many configuration and the devices are stand alone. For this project there is need ...
5
votes
2answers
648 views

Is the 3-cm band serviced by any commercial main-stream ham radio transceiver?

Wikipedia writes to say The Radio Regulations of the International Telecommunication Union allow amateur radio operations in the frequency range 10.000 to 10.500 GHz, and amateur satellite ...
5
votes
2answers
241 views

Can anyone identify this military radio?

Hoping someone can identify the following military radio. I spotted it at the curb and decided to make it a land-fill diversion project...
5
votes
3answers
1k views

Battery capacity vs. weight for portable transceivers

What kind of battery has the most capacity for the weight? I want to take my transceiver backpacking, so I care about weight.
5
votes
1answer
427 views

Boefeng UV-5RE scanning capability

Since the factory manual is simple and basic, is it possible to use the Baofeng UV-5RE to do these things? Listen to FM radio, while scanning 2m and 70cm bands in the background (as in hiking) Set ...
5
votes
1answer
817 views

What makes a good emergency-capable QRP rig for travel?

It's wintertime, which drives the concept of emergency preparedness here above the 45th Parallel. Am emergency-capable QRP rig is an excellent item to stuff into one's Go Bag or vacation gear, always ...
5
votes
1answer
97 views

Powering transceiver and SWR/power meter from same supply?

I'm mostly sure this will be ok, but I'd like to confirm. I have a switching power supply (can't remember the model right now, but it's for ham use, 13.8V/30A) and I'd like to power both the FT-857D ...
5
votes
2answers
1k views

What is an cheap and easy to build kit for a sw ssb transceiver? [closed]

I have a licence since I was 14 which is exactly half of my life, but honestly with the advent of the internet I somehow lost interest and sold my equipment. Now I really start to think, I should ...
5
votes
1answer
224 views

Receiving commercial / public-safety on a general-coverage HAM transceiver

I have an ICOM-7100 that I've installed in my mobile as my primary (nay, only) HAM transceiver; and I'm trying to avoid wasting a ton of space in my vehicle (not to mention money) for a proper scanner,...
5
votes
1answer
114 views

How long can a transceiver be unused before I have to use a variac?

I have an old TenTec Argosy II that hasn’t been powered up for 20 years. How long can electronics go unpowered before I have to worry about the electrolytic needed a slow power up with a Variac?
5
votes
2answers
1k views

Adapting an antenna coupler

I've built AA5TB's antenna coupler: I left out C2 because I didn't understand why I would need it - why would I? It works fine without. Unfortunately, when I started tuning for a 5W 20m transceiver, ...
4
votes
3answers
136 views

What is the difference between RIT and XIT?

What is the difference between RIT and XIT? When would one use one and not the other for split (or other) HF operation? When would one need both? Which one is more useful for a transceiver to have ...
4
votes
2answers
357 views

When was the first radio transceiver (transmitter/receiver) built, and by whom?

I'm really passionate about signals and communications ever since I was a child where we "built satellites" - little did I know that it would become part of my future. So here is my first question: ...
4
votes
1answer
281 views

Yaesu FT-991A: FM and C4FM modes don't work on HF bands

I bought a second-hand Yaesu FT-991A. It works pretty well and by the look of it's internals I don't believe it was ever repaired. However I noticed one weird thing. When I try to use FM or C4FM on ...
4
votes
1answer
156 views

Does a UHF/VHF handheld transceiver kit exist?

I am a licensed ham looking for a UHF/VHF handheld transceiver kit. Unfortunately so far I was only able to find broken links, i.e. Ten-Tec used to produce exactly such a thing but they just don't ...
4
votes
1answer
233 views

Listening below the carrier frequency gives a weaker signal than above the carrier frequency - why?

I have a 20m CW transceiver with an option for a wide or a narrow filter. When the narrow filter is selected, a crystal ladder filter is used in the intermediate frequency filter, between two mixers. ...
4
votes
2answers
2k views

What radios compare favorably with the FT-817ND? [closed]

I've been asked to specify an amateur radio for a project which is very general purpose in nature, including HF, VHF, and UHF bands. Cost and user friendliness is a concern, so I wanted to avoid ...
4
votes
1answer
122 views

How can I establish a wireless link between my PC and TenTec 506 / chipKIT UNO32 using USB port?

I have a TenTec 506 HF transceiver that uses a Digilent chipKIT UNO32 microcontroller. My PC running Teraterm (serial connection) or the MPIDE monitor is connected to the microcontroller's mini B USB ...
4
votes
1answer
367 views

Is there a repository of modern Amateur Radio transceiver schematics? [closed]

I am looking for a repository (SVN ect) of modern Amateur transceiver schematics. Most of the designs you can find with a simple Google search either use tubes, or now obsolete and hard to find ...
3
votes
3answers
281 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 ...
3
votes
2answers
14k views

Difference between Boefeng UV-5RE Plus and UV-5

I bought a Baofeng UV-5RE Plus, which presumably is an improved version of the basic UV-5. There is lots of information online on the UV-5. Any idea where I can find out what are the differences and ...
3
votes
4answers
374 views

What is the use of dual VFOs?

What is the value of more than one VFO in an HF transceiver? Many novice rigs only have a single crystal oscillator, and a vast number of famous classic transceivers, HF kits, and QRP rigs only have a ...
3
votes
1answer
588 views

Receiving through a linear amplifier

I want to build a simple amplifier using those Mitsubishi modules (like the RA30H1317M or other RA parts). I know this might seem like a very obvious question, but I am unable to find the answer after ...
3
votes
4answers
2k views

Bluetooth headset for transceiver?

Is there a way to use a Bluetooth headset with my transceiver to eliminate all the wires, like a Bluetooth adapter? It seems like all the Bluetooth applications require a smartphone in the loop ...
3
votes
1answer
106 views

Can the external VFO input in a Heathkit SB-(100, 101, 102) be used to operate on frequencies outside the radio's normal range?

I've got a Heathkit SB-102 that I'm working on making operational (problems with transmit, receiver works just fine). This model radio has a 9-pin Molex connector in the back, intended to connect an ...
3
votes
2answers
8k views

Looking for a UHF / VHF transceiver for PC.`

I am looking for a simple UHF / VHF transceiver that I can plug into my PC via USB and be able to RX/TX on one channel, using the built in mic... Maybe even record the RX from the freq. Everything I ...
3
votes
1answer
1k views

Simple FM low power UHF transmitter circuit

I want to build an low power transceiver on 33cm or 23cm (or 2 meters, but not recommended because of all the other activity interfering with my stuff) I would like to use FM and just have enough ...
3
votes
1answer
464 views

Can an external VFO be injected into a commercial rig?

Constraints of various kinds preclude any investment in a rig at present; so I find myself pondering the means to get back on the band piece-meal. Say I were successful in an attempt to throw ...
3
votes
1answer
141 views

What is this military radio?

Please help me identify this piece of equipment. It looks military spec, but don't know anything about it. I want to look up some history about what it was used for. Here are more photos.
3
votes
2answers
1k views

Which HF transceivers feature a built-in Ethernet port for remote operation? [closed]

I would like to compile a list of HF transceivers that feature an Ethernet port (RJ45) for remote internet operation. It would also be interesting to add the supported operating system(s) for remote ...
3
votes
1answer
437 views

Relations between bit rate, frequency deviation and channel filter bandwidth

I just started using a couple of low power radio modules in my project (HopeRF RFM69HCW). I made them work; they successfully transmit messages in a limited range (5-10 meters). Now I would like to ...
3
votes
1answer
373 views

Can I receive raw on-air data using Kenwood TS2000?

The TS2000 has inbuilt AX.25 support. However, is it possible to use the TNC in a "transparent" mode so that I can view the on-air data without any decoding? Upon basic searching, I came up with this ...
3
votes
1answer
893 views

How do I select a programmed memory scan on the Yaesu FT-897D?

The Yaesu FT-897D has a so-called “Programmable Memory Scan (PMS)” feature, which allows limiting scanning to a user-defined band by creating special paired memory entries which set the upper and ...
2
votes
3answers
471 views

Can I use two yagi aerials back-to-back for a bi-directional system?

I need to create a setup where I have three radio transceivers (869.4MHz) setup in a straight line. I need to be able to communicate, in both directions, from the centre pole to the outside two poles,...
2
votes
1answer
149 views

Where does this common spurious transmission come from? Is there a quality difference?

I decided to see what my ham transmissions look like on an SDR and was kind of shocked to see how much leaks out. The waterfall display is split between two handhelds during transmit. There are a ...
2
votes
4answers
900 views

What is a simple kind of amateur radio transceiver I could try to build, as a beginner?

I am new to amateur radio, and I'm trying to learn the basics of the hobby. I would like to build a simple radio transceiver from scratch (i.e. not from a kit). I have searched the Internet for ...
2
votes
2answers
2k 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 ...