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Questions tagged [transceiver]

Use this tag for general questions relating to transceivers.

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2 answers
1k 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 ...
0 votes
1 answer
268 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) ...
2 votes
2 answers
131 views

How do I ground my first HF rig?

I want to preface this question saying that I am very new to HF and just got my general license. I have only operated using 2m/70cm handhelds and am completely unfamiliar with antenna setup. I ...
0 votes
0 answers
74 views

Audio QAM Transceiver Problems GNU Radio

I'm learning radio techniques and am building transceivers for different modulation methods in GNU Radio. I am trying to develop a 16 QAM transceiver but I am having a huge amount of issues getting a ...
3 votes
2 answers
119 views

Automatic switching of RX antenna -- xcvr has only one antenna connection (SO-259)

I have a local noise problem that's pretty intractable, especially on low bands. I'd like to at least experiment with a loop-on-ground RX antenna -- I've got a 1/4 acre to play with. My IC-718 has ...
0 votes
0 answers
69 views

My icom IC 735 has no TX, external meter shows correct amount of power but no one can hear me

I pulled apart to get to the pa board and checked the three amp fuse it was fine. All I could find on the main board was diodes D33 and D34 were cut but I learned that was from the Mars mod. Im ...
-1 votes
1 answer
332 views

How do you get the uSDX+ transceiver to work properly?

I saw this relatively cheap transceiver on amazon. So, I thought, for a beginner like me, why don't I buy it? I didn't want to buy the thousand-dollar icom transceiver, so I was left with that option. ...
0 votes
1 answer
102 views

Transfer digital data over ham radio frequencies using QPSK modulation SSB-QPSK transmitter

If I use QPSK modulator/demodulator is it possible to transfer digital data over ham radio frequencies. SSB-QPSK transmitter
4 votes
2 answers
505 views

Transceivers connectable with bluetooth hearing aids

I'm a rower in the Netherlands. Rowers are typically coached via transceivers or a megaphone. I am hearing impaired and I will get new hearing aids soon. These will be equipped with bluetooth. My ...
0 votes
1 answer
1k views

How to ground a transceiver in an apartment?

I've got some really dumb questions about station grounding. For starters, I live in an apartment; how can I ground a transceiver station using that screw on that back? I've got nowhere to sink a ...
2 votes
4 answers
431 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? ...
1 vote
1 answer
58 views

On KENWOOD TS2000, the CW messages don't record even after the "recording wait" pops up in the display. But the sidetone works fine

I'm working on a miniproject where i'm asked to demonstrate the recording of some signal. I made a keyer connection using a earphone cable to my Kenwood. The Keyer works fine - the sidetone is audible ...
1 vote
1 answer
165 views

Swapping crystal from HF to VHF in a QRP tranceiver

I am trying to build a short-range QRP weak signal VHF 2m CW transceiver. I found a small circuit that fit my needs, but it was made for use on 40m instead of my target frequency. The circuit included ...
9 votes
3 answers
4k views

Why do single band 10 meter radios exist?

I wonder why special radios for 10 meter band are manufactured? On the one hand - any fully-fledged HF transceiver includes 10 meter band. On the other hand there are no only "15 meter band" ...
0 votes
3 answers
202 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 ...
0 votes
1 answer
130 views

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
471 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 ...
6 votes
2 answers
254 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 ...
4 votes
3 answers
955 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
2 answers
232 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 ...
2 votes
1 answer
168 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 ...
0 votes
1 answer
156 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 ...
0 votes
2 answers
97 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 ...
1 vote
1 answer
124 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. ...
4 votes
1 answer
167 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 ...
1 vote
4 answers
295 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 ...
3 votes
3 answers
9k views

Baofeng uv-82 will not transmit in channel mode?

I have 2 Baofeng UV-82 radios. I programmed the frequencies using Chirp. When I try to access the repeaters in channel mode I cannot connect. When I switch to frequency mode and turn off the duplex ...
0 votes
1 answer
306 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 ...
9 votes
2 answers
4k 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 ...
2 votes
1 answer
327 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. ...
3 votes
2 answers
129 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' ...
2 votes
3 answers
426 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 ...
2 votes
0 answers
168 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 ...
5 votes
3 answers
531 views

Heathkit SB-102 Plate Current out of control

I bought a "technician special" Heathkit SB-102 transceiver. Everything seems to work well until I attach a dummy load and try to go through the "initial tune up" procedure in the manual. At the ...
0 votes
2 answers
1k 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 ...
4 votes
1 answer
368 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 ...
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
564 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 ...
3 votes
2 answers
1k 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 ...
1 vote
2 answers
1k 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 ...
2 votes
1 answer
5k 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?
0 votes
3 answers
4k 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?
6 votes
2 answers
9k 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?
4 votes
1 answer
1k 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
4 answers
12k 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 ...
4 votes
2 answers
2k 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 ...
3 votes
1 answer
246 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 ...
3 votes
2 answers
882 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 ...
2 votes
3 answers
1k 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. ...
0 votes
0 answers
36 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 ...