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Questions tagged [transceiver]

Use this tag for general questions relating to transceivers.

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0
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1answer
19 views

Audio too high, how to troubleshoot

I am using a TYT TH-9800 with a 10 m half dipole antenna on low power (5 W) to connect to a WIN linked repeater (+5.0 MHz offset and 123.0 tone). I made contact with two other stations and was told ...
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2answers
57 views

How should i go about building my first transceiver?

So i want to build my very own transceiver, not looking for anything worldwide, just local but i do have a background in arduino and some electrical engineering, what tutorials would you recommend?
4
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1answer
130 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 ...
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2answers
91 views

If I parallel two crystal filters together, will that double the bandwidth? [closed]

Will the bandwidth be doubled ? And will the impedance be halved ?
5
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2answers
156 views

Can anyone identify this military radio?

Hoping someone can identify this military radio... I spotted it at the curb and decided to make it a land-fill diversion project...
0
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0answers
54 views

Can I make a simple Tx/Rx antenna (Radio System) which will receive signal from BTS and broadcast/transmit it, and vice versa? [duplicate]

Consider a situation as below. I am stay in a farm field, which my house is 9.4km distance from the nearest and the only one BTS (Base Transceiver System), a cellular antenna for transmit and receive ...
1
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1answer
30 views

Can the transmit and receive functions of a boat anchor transceiver share the tank circuit?

I'm starting design work on a two-tube (two-valve, for those who prefer that term) reflex-regen receiver that I hope will cover AM broadcast through 160m-10m -- both amateur bands and those "in ...
1
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1answer
27 views

Power output of KT8900

Any ideas on adjusting the low power output of the KT8900. The output tranny has a max rating of 12V and specs are centred on 7.5 volts. Yet they try to run it at 13.8V?? I want to reduce the output ...
5
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1answer
106 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?
2
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4answers
401 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
1answer
107 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 ...
1
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0answers
77 views

2GFSK 9600bps Transmitter and amplifier for 433 MHz

I'm looking for a reliable, however cheap solution for ground-space communication. I need at least 50W of transmitted power with 2GFSK modulation at 70cm band (433 MHz). Transmission will be done ...
5
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2answers
257 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 ...
2
votes
3answers
195 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,...
13
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3answers
1k 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 ...
3
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2answers
235 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: ...
2
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1answer
208 views

Can I monitor a refrigerator using ham radio?

I am considering the ramifications of monitoring my refrigerator conditions using ham radio. Can the radio on the refrigerator be under automatic control using my call sign so that I do not need to ...
6
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2answers
299 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,...
5
votes
1answer
76 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 ...
2
votes
1answer
81 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 ...
3
votes
1answer
258 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 ...
0
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2answers
132 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 ...
0
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1answer
71 views

Can two 315MHz RF modules communicate with each other if none of their frequencies are exactly 315MHz?

I bought two RF modules that were made by different manufacturers. They were both labeled 315MHz on the manufacturers' websites. However, when I tested their frequencies with SDR#, I saw that even ...
3
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4answers
1k 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 ...
0
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1answer
929 views

LoRa Radio RFM96/98 SX1276/8 configuration settings for Longest Range

I have a pair of HopeRF LoRa RFM98 Radio Modems(based on Semtech SX1278) and I want to configure them for the longest range possible, without taking care about any second factor like transmission time ...
0
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3answers
874 views

Can I test a base station CB radio with a magnetic mobile antenna?

I am looking at a base station and want to test it before purchasing can I use a magnetic mobile antenna to see if it transmits and receives without damaging it?
2
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1answer
431 views

Are wireless transceivers affected by strong magnetic fields?

Are wireless transceivers affected (performance or life) by strong magnetic fields? If yes, why?
1
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1answer
410 views

How does a transceiver work?

I recently joined my university's Cube-Sat Program and was delegated the task of looking for software that modulates and demodulates signals (~437MHz, GMSK, AX.25). The problem now is that I don't ...
1
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0answers
500 views

Autoranging problem for AX5043 transceiver (437.025MHz)

I am trying to configure AX5043 transceiver(ONSEMI) for PSK modulation and system parameters are as follows: ...
5
votes
1answer
158 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,...
1
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1answer
117 views

What issues can I expect when using Bluetooth for packet radio?

So I have an IC-2730, which doesn't have external inputs for packet radio, but it does have optional board for Bluetooth connectivity and there's also an optional Bluetooth headset for it. I'm trying ...
0
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2answers
880 views

What is Digital Mode on newer HF Transceivers

What does switching to digital mode on Yaesu Xcvr's (or any other HF radio) actually do? The documentation states that "specific digital mode selections, which include custom BFO offsets to optimize ...
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?
3
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1answer
455 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 ...
6
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4answers
806 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 ...
1
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0answers
52 views

Transformer secondary coil impedance [closed]

To transfer maximum power from the secondary coil to the load, I need to find secondary coil impedance. My load impedance 5 - J365. I would design a matching circuit between load and secondary coil, ...
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
votes
1answer
399 views

VHF antenna / receiver suggestion for a UAV

I am currently working on a student project that involves having a UAV fly an orthogonal path over a series of transmitters -- taking in data (through an arduino-based system for data processing). ...
2
votes
1answer
135 views

Where to pull audio for packet on an alinco DR-600

I have an old Alinco dual-band radio, the DR-600 (service manual) (manual) I want to use this radio for receiving APRS packets. The speaker audio out Works but there are too many things to go wrong ...
3
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2answers
7k 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
308 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 ...
5
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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 ...
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 ...
4
votes
1answer
223 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
1answer
117 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 ...
8
votes
1answer
474 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 ...
5
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2answers
852 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, ...
10
votes
4answers
552 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 ...
1
vote
2answers
251 views

KN-Q7A - A good place to start? [closed]

I have decent circuit knowledge and would like to get into some homebrew operating, specifically voice. Would the KN-Q7A be a good place to start? If so can I just get the parts and do the circuit ...
5
votes
1answer
329 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 ...