Questions tagged [transceiver]

Use this tag for general questions relating to transceivers.

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Transfer digital data over HAM using QPSK modulation SSB-QPSK transmitter

If I use QPSK modulator/demodulator is it possible to transfer digital data over HAM. SSB-QPSK transmitter
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1 answer
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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 ...
2 votes
0 answers
59 views

What could cause an Icom IC-756 Pro II to suddenly stop transmitting?

My HF radio (Icom IC-756 Pro II) suddenly won't receive or transmit. I recorded the sound it makes when receiving and uploaded it to https://w7bkg.org/wiki/File:Radio_Issue.wav . It sounds the same on ...
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1 vote
3 answers
120 views

Why are VHF radios so much cheaper than HF ones?

Why do VHF-UHF radios tend to be cheaper than HF ones? There are expensive VHF radios and relatively cheap HF ones, but finding a cheap VHF radio is much easier than finding a cheap HF radio. Why? ...
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3 votes
2 answers
109 views

Antenna reciprocity how does an antenna increase receiving range?

According to Wikipedia antennas are reciprocal unless they're constructed of nonreciprocal materials. There are a multitude of mathematical formulas which unfortunately I'm unable to understand due to ...
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1 answer
93 views

Where can I go for ham radio reviews? [closed]

I was wondering what would be the best startup HF transceiver for the 3-30 MHz band. I have not found any which appear to match my requirements for under $200. What would some ham radio sites be with ...
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2 answers
70 views

NooElec for Startup HF Communication

I am working on setting up a Ham Radio shack for long distance communication on the HF frequency. The goal is to transmit 1,200km from Alberta to Manitoba using skywave propagation. I would need to be ...
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1 answer
97 views

Transmitting high-speed PWM over RF

First, let me apologize in advance if this isn't the correct exchange to post this question on. I have a 50 MHz PWM signal (it's actually a 50 MHz 50% DC clock with a 1PPS clock embedded with PWM) ...
0 votes
1 answer
107 views

Best CW Low Cut & High Cut Slope Settings on the Yaesu FT-991A?

I am running a Yaesu FT-991A and am wondering which low and high cut slope settings would be the better to use on CW mode as far as making sure I don't get key clicks. The default menu # 051 = CW LCUT ...
2 votes
1 answer
64 views

Getting a PTT Signal for Digital Radio Kit; Right Channel PTT in JS8Call

I want to buy this 5 W transceiver kit from QRP Guys, link. My plan is to use it with JS8Call on an ARM64 Chromebook I have or even my smart phone with AndFlmsg (FSK modes). It's clear that the radio ...
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2 votes
1 answer
160 views

How to handle old stuck tuning slugs?

My Swan 350 radio has tuning slugs in the VFO to handle different bands. The 10-meter band has a slug that wont come out, I may need to use a longer wrench but these old slugs break apart and crumble. ...
1 vote
1 answer
84 views

Swan 350 calibration

So my swan 350 needs to sing properly and order it for to do so the VFO needs to be calibrated. I do not have a working frequency counter. How do I get this stuff fixed so I can get her singing right. ...
3 votes
2 answers
79 views

how to sink 9-15v under control of 5v or 3.3v pin to 'key-down' transceiver?

I want to use an Arduino to control keying transmission on a simple CW-only transceiver (think: forty-9er or Pixie). Looking at the schematics of various such transceivers, they basically 'key down' ...
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2 votes
3 answers
98 views

Motorola Microphones

Can a person use moto mic's on all their radios by rewiring the end plugs I have a few mic's and want to change the plugs to work on my Gn300's and Maxtracs and how to do this re Colors and positions ...
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4 votes
1 answer
191 views

Can a regen receiver be used as a CW transceiver?

I've looked for a while, but I've never found a design like what I imagine: a single-tube (valve) regen CW transceiver (no cheating with a tube/valve that has two or more triodes/tetrodes/pentodes in ...
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4 votes
1 answer
88 views

SSB Single Conversion Superhet 2nd Mixer IF Termination on Transmit

I have a question about "best practice" in regards to how the 2nd mixer IF port is coupled to (in my case) a 20m double tuned filter on transmit. I'm currently building out the transmit ...
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2 votes
0 answers
99 views

Diagnosing IC-7100 Drive Amp Bias | PA Won't TX

A faulty in vehicle DCDC charger has fed 16V or so into my brand new IC7100, killing the main board and preventing it from transmitting. I've replaced the mainboard with a brand new one however I'm ...
0 votes
1 answer
58 views

How a reply system works on a aircraft transponder? [closed]

I'm trying to build a transponder ramp test for mode c and s of aircrafts for my degree. I have a problem, I didn't understand reply system of transponde, how can I doba reply of a signal to test one?
5 votes
1 answer
315 views

What is band stacking?

What is a band stacking register and/or band stacking buttons on a transceiver? And why would this be useful to an amateur radio operator? Is using "band stacking" a current operating ...
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6 votes
2 answers
4k views

What does ALC do on a transceiver?

What is ALC on an HF transceiver? What are the disadvantages (if any) of operating using a rig without ALC? What might be the difference between a good and bad implementation of ALC?
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4 votes
1 answer
792 views

Looking for origins of a crystal filter schematic used in uBITX

Here is a crystal filter used in uBITX transceiver: I've never seen such a topology in any other transceiver and decided to invest some time in exploring it. Turned out it's quite interesting. Eight ...
3 votes
1 answer
184 views

Kenwood TS 520 S Meter accidentally run without an antenna connected

I powered up my Kenwood TS 520 without connecting the antenna and after 1 hour realized it was not connected, after connecting the antenna I noticed the S-meter was not giving me a reading and I have ...
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3 votes
2 answers
549 views

SSB Transceiver Architecture - USB with Crystal Filter

I'm planning to build a 20m SSB transceiver and I want to get the overall architecture straight in my head first. Here's what I'm thinking so far, a single conversion superhet design with a 9MHz IF ...
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0 votes
3 answers
149 views

How can the waterfall still be displayed during transmission

I noticed that on some higher-end transceivers, the panadapter/waterfall is still being displayed during transmission. How is this possible? If the panadapter is part of the receiver, it should be ...
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1 vote
3 answers
654 views

What replaces the T/R switch in modern transceiver

I have been watching and reading about the time when receiver/transmitter were separated and T/R switches were used. Current transceivers are still sharing a single antenna to transmit and receive. ...
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0 answers
34 views

Using radio for musical collaboration [duplicate]

I'd like to collaborate (e.g. play together) with other musicians in my local area and/or beyond. Coronavirus has made in-person collaboration difficult. Latency makes internet-based collaboration ...
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0 votes
1 answer
84 views

Old 144MHz rig can transmit/receive signal but not voice

Situation: I have an old 144MHz rig from the 2000's, an IC-271. I am trying to get it up and running. Summary of the problem: I can receive fine on the rig, except for from my HT. I can transmit a ...
1 vote
3 answers
244 views

Lab599 Discovery TX-500 connectors?

The Lab599 Discovery TX-500 is coming out soon. A lot has been said about that radio's use of weather-resistant proprietary connectors, but what are the actual connector types? The antenna is female ...
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0 votes
1 answer
159 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 ...
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4 votes
3 answers
3k 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 ...
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3 votes
4 answers
1k 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 ...
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0 votes
2 answers
204 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
4 answers
243 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 ...
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0 votes
2 answers
881 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
2 answers
896 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
2 answers
149 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 ...
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4 votes
3 answers
513 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
1 answer
125 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!
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1 vote
2 answers
569 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 ...
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4 votes
2 answers
1k 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 ...
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0 answers
41 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?
3 votes
2 answers
750 views

Advantages of IQ mixer versus direct 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 0 Hz on up) with a fast ADC or DAC? Are ...
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-1 votes
2 answers
175 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
1 answer
970 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
2 answers
176 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
1 answer
148 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
1 answer
154 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
1 answer
267 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 ...
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0 votes
1 answer
68 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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0 votes
2 answers
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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?
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