Questions tagged [transceiver]
Use this tag for general questions relating to transceivers.
78
questions
4
votes
1answer
81 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
69 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
165 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
68 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
113 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
123 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
140 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
76 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
42 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
66 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
148 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
103 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
226 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
60 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
45 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
39 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
112 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
704 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
126 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
89 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
301 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
306 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
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 ...
4
votes
2answers
294 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
251 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
358 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
85 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
83 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
352 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
144 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
75 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
1k 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
527 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
478 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
548 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
182 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
vote
1answer
128 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
votes
2answers
922 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
votes
1answer
2k 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
votes
1answer
513 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
votes
4answers
892 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
vote
0answers
54 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
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 ...
2
votes
1answer
412 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
153 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
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
344 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 ...
