Questions tagged [transceiver]
Use this tag for general questions relating to transceivers.
62
questions
1
vote
1answer
24 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
102 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?
1
vote
4answers
196 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
101 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
75 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 ...
4
votes
2answers
246 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
148 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,...
12
votes
3answers
988 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
votes
2answers
202 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
174 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
votes
2answers
262 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,...
4
votes
1answer
72 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
79 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
223 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
119 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
70 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
906 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
883 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
781 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
381 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
394 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
465 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:
...
4
votes
1answer
145 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
114 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
864 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
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
votes
1answer
430 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 ...
5
votes
3answers
737 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
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
votes
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
393 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
129 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
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
295 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 ...
4
votes
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
973 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 ...
7
votes
1answer
453 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
votes
2answers
816 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, ...
9
votes
4answers
545 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
250 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 ...
4
votes
1answer
309 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 ...
2
votes
2answers
10k views
Difference between Boefeng UV-5RE Plus and UV-5
I bought a Baofeng UV-5RE Plus, which presumably is an improved version of the basic UV-5.
There is lots of information online on the UV-5. Any idea where I can find out what are the differences and ...
5
votes
3answers
3k views
Is there any PC remote control software for the Baofeng UV-5RE Plus?
I saw on YouTube that some software, with another brand transceiver, can command the transceiver to scan a range of frequencies and display a running waterfall display of scanned results.
Can such a ...
4
votes
2answers
2k views
What radios compare favorably with the FT-817ND? [closed]
I've been asked to specify an amateur radio for a project which is very general purpose in nature, including HF, VHF, and UHF bands. Cost and user friendliness is a concern, so I wanted to avoid ...
2
votes
2answers
3k views
Baofeng uv-82 will not transmit in channel mode?
I have 2 Boafeng 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 ...
3
votes
1answer
433 views
Can an external VFO be injected into a commercial rig?
Constraints of various kinds preclude any investment in a rig at present; so I find myself pondering the means to get back on the band piece-meal.
Say I were successful in an attempt to throw ...
2
votes
1answer
377 views
What does the “USER” programmable key function do on the Yaesu FT-897D?
I was just reviewing the manual of my Yaesu FT-897D to remind myself of useful functions I might have forgotten about, and I found the programmable function keys, which can be set to any of “All Multi ...
-2
votes
1answer
120 views
multiband mimo ad-hoc wireless connections from different spectrums [closed]
I'd like to create a multiband MIMO ad-hoc wireless network. Can I turn on every GPS, WIFI and Bluetooth radio of a mobile device and synchronize data transfers at extreme speeds between a small, ...
