Questions tagged [transceiver]
Use this tag for general questions relating to transceivers.
89
questions
0
votes
1answer
62 views
How does PTT from one two-way radio prevent input on another?
I'm very much a beginner with radio. I have a simple set of Baofeng BF-888S radios, and in my basic use with those, I got very curious about something: when you push the PTT button on one radio to ...
4
votes
3answers
75 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 ...
3
votes
4answers
315 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 ...
0
votes
2answers
41 views
How Duty cycle affects transmission rate in RF module?
I planning to use RF module for communication of high precision GNSS module. So I am doing detail study on RF module. In one of the datasheets of RF module (part no: RFD868ux) mentioned that 'Duty ...
1
vote
4answers
144 views
Can't identify old Chinese(?) and American radio/telephone
I have searched image banks and Googled period radios, but I can not identify these old units. I picked them up overseas in SE Asia and I got them as projects to teach myself enough to challenge the ...
0
votes
1answer
71 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 ...
5
votes
2answers
867 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 ...
-1
votes
2answers
108 views
Why can't we use a simple wire for receiving 2.4 GHz signals?
I wanted to build a small drone of my own as a hobby project. My old drones were broken so I wanted to salvage as much as I could to build a small indoor one. I wanted to use an Arduino, however, I am ...
3
votes
3answers
264 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 ...
0
votes
1answer
29 views
Problem with mAT30 ATU and FT-450D transceiver
Does this tuner work with this transceiver? Would appreciate response as I cannot get it to work!
0
votes
1answer
28 views
QYT KT8900D issue
A very specific issue this one. I bought one of these radios on an impulse because it was cheap but never really used it. Now, during lockdown my club has a nightly net on 2m so I built an antenna and ...
4
votes
1answer
190 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 ...
0
votes
0answers
38 views
how do you tune blind? [duplicate]
I'm about to axe the display on my radio in pursuit of cheapness. However, I need to know, how do blind hams with older rigs tune to a station?
1
vote
2answers
92 views
Advantages of IQ mixer versus baseband sampling SDR architectures?
What might be the advantages, if any, of HF SDR architectures that use a mixer between the ADC/DAC and RF, versus those that sample or generate RF directly at baseband with a fast ADC or DAC?
Are the ...
-1
votes
2answers
170 views
At what watt level is it safe to use metal strips for modulated signals?
In my working design, I have a transceiver TX on low power; Then boost it in a preamp phase in the back.
The way I'm sending the signals (RX and TX) through the radio is by a network of 1/8 to 1/4 ...
0
votes
1answer
79 views
Lowest cost portable HF radio with at least 100 W output?
My use case is intercontinental HF radio, and I am frequently traveling. Lugging a big rig is inconvenient and expensive ones get you into customs trouble all the time. So, I'm looking for a low cost ...
2
votes
2answers
120 views
What is a good step resolution in tuning and transmitting?
When constructing a new radio, what should your step resolution be and what is considered too much in resolution in frequency tuning and transmitting?
I'm talking about capacitor type tunning.
...
3
votes
1answer
136 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
1answer
143 views
Carrier telephone system adaptation
In amature radio, users can use what is called a phone patch to enable them to use a phone to establish connection to another party or user.
Phones are usually two wire and dont lend themselves to ...
3
votes
1answer
91 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 ...
0
votes
1answer
48 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 ...
0
votes
2answers
70 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
votes
1answer
154 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 ...
1
vote
2answers
109 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
votes
2answers
233 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...
0
votes
0answers
68 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
vote
1answer
49 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
vote
1answer
80 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
votes
1answer
113 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
votes
4answers
832 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
143 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
vote
0answers
96 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
votes
2answers
345 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
410 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
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 ...
4
votes
2answers
332 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
votes
1answer
280 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 ...
7
votes
2answers
400 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
92 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
87 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
398 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
votes
2answers
155 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
votes
1answer
76 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
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 ...
0
votes
1answer
1k 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
votes
3answers
2k 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
votes
1answer
586 views
Are wireless transceivers affected by strong magnetic fields?
Are wireless transceivers affected (performance or life) by strong magnetic fields? If yes, why?
1
vote
1answer
495 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
vote
0answers
562 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
206 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,...
