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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 ...
0
votes
0answers
26 views

How to program a trunked System into radioshack pro 651?

am new to this forum, so tell me if this question is out of place - as it concerns a scanner. I have an old radioshack pro-651 (same model as pro 106, and whistler 1040) that I am trying to program ...
0
votes
1answer
43 views

0X1C error on APRS.FI

I get a 0X1C error in APRS.FI and my beacon does not show on ui-view32. I am totally lost. Any idea what I am doing wrong? ...
4
votes
1answer
68 views

AM Radio Envelope Dectector

How do you choose the values of the capacitor and the resistor in an envelope detector circuit? In my case, the frequency range is from 20 Hz to 20,000 Hz. Also, am I correct in understanding that ...
2
votes
2answers
82 views

Yagi: split or solid driven element?

Short question: What are the advantages and disadvantages of using gamma (solid element) or beta (split element) matching a yagi? Long question: A while ago I built a coil loaded yagi for the 20M ...
3
votes
2answers
41 views

Connecting Directional Antenna To Two Antenna Ports on NIC

I want my n/ac Wi-Fi card to operate in a spatially directional manner. To achieve that I want to use a directional antenna(s). There is a slight complication though, because my Alfa AWUS036ACH ...
2
votes
2answers
76 views

How long does it take the FCC to process vanity requests?

How long does it take for the FCC to process vanity callsign applications? My application shows as Pending in license manager but oddly does not show up at all in Application Search.
1
vote
2answers
77 views

What is the best time of day to contact Japan from the east coast?

What are the best times in early April to contact Japan on 40M and 20M from Pennsylvania?
3
votes
1answer
93 views

Do the Horizontal Conductors of a Ground Plane Antenna Adequately Decouple Its Feedline?

A NEC4.2 analysis of this configuration may reveal an unexpected truth about this...
2
votes
2answers
145 views

Magnetic loop antenna : loops vs selectivity

I've built 2-turn magnetic loop RX antenna using 5 meters of 6.5mm copper tube. I was able to tune it with a variable air-spaced capacitor in the range of 1.8-10Mhz, but I noticed that as tuning ...
2
votes
2answers
101 views

how do get a duplicate of my radio amateur license KP4CSJ

My call KP4CSJ (general) I will like to get a copy or duplicate of my license. I lost my and i will like to to hang it in may shack. I am an old timer ham radio over 50 years. Thanks for your help
0
votes
1answer
64 views

I have a hf vertical antenna I'd like to put on my high-rise balcony

If I mount an HF vertical antenna at say a 45 degree angle to avoid a balcony ceiling, what do you suppose might happen?
1
vote
2answers
73 views

“Remote” two-wire PTT and audio for rig

I live in a spot where I would be useful for weather spotting, but I can't reach the repeater with a handheld (I can hear just fine, but they can't hear me.) My base is in a detached garage, and I'd ...
4
votes
2answers
163 views

Using an SDR on a Laptop with Noisy Power Supply

I'm going to start this off by saying I'm very new to this and I don't really know a lot so any detailed information would be much appreciated. I have just started using an SDR (a cheap RTL model) ...
3
votes
1answer
78 views

Should I use the same grounding rod to ground my radio and my random wire antenna?

I have an end fed random wire antenna about 50 feet from my shack into an antenna tuner. I do not have the option to install a ground rod at the house entrance but I do at the antenna feed point. The ...
3
votes
0answers
137 views

The whole neighborhood's internet drops when I transmit on 40M

I recently built a vertical. It's 6M radiator, a coil, and 1.2M more of radiator. It sits on my roof, which is metal, and acts as a ground plane (GND from the feedline is connected to it). There is a ...
3
votes
3answers
91 views

NFM and FM compatibility

I read that using narrow band (NFM) when you should be using normal(FM)/wide-band(WFM) can result in the a reduced volume at the receiver. What happens in the opposite situation? (What if you are ...
0
votes
1answer
40 views

Detect multiple broadcast on same channel

I have a number of ear guards with two way radio communication. They can only be set to send and receive on the same channel, and they have the option of dividing themselves according to the ctcss ...
0
votes
2answers
72 views

Loop on ground for transmit?

If a large horizontal loop antenna, insulated but laying at ground level, works as an MF and low HF receive antenna, why (even though it has very high ground losses) can't it be used for transmit (to ...
3
votes
2answers
224 views

What is the radiation pattern of an ~60 foot end fed wire antenna used for 40 meters?

I live in a retirement center. The rule here is “Never do anything anywhere at anytime.” That translates to “No Antennas” which I have been told means I can put out an antenna as long as it is ...
1
vote
2answers
70 views

Is the time code a way to reduce paper work when it comes to logs?

So a clock can listen to a station WWVB to update time. My question is: Could you use the time code to mark your logs in conjunction with a recorder thus doing away with paper logs all together.
1
vote
4answers
191 views

Magnetic loop antenna: vertical vs horizontal

I have a magnetic loop antenna for T/R with remote tuning. I would like to mount this in the attic horizontally. Will I loose much performance between mounting it horizontally verses vertical?
5
votes
2answers
90 views

Why does capacitive loose coupling increase selectivity?

There are mutliple ways to couple antennas. It is said that an antenna is capacitive loose coupled if a small capacitor is used between the antenna and the parallel resonant circuit (like C2 in the ...
2
votes
1answer
94 views

Lost all pre-programmed channels in BaoFeng UV-5R V2+ after reset. What were they and how do I restore?

I purchased my first radio, and of course I reset it to factory defaults soon after I received it. (I think that wasn't the best thing to do) What options do I have to restore the radio to as-shipped ...
4
votes
2answers
927 views

What are the regulation requirements for running a repeater?

When I try to find information on the requirements to run a repeater, I just see a lot of results related to building one. But I'm wondering about USA regulations. Does one need a particular license?...
0
votes
2answers
51 views

2 meter coax cable balun dimensions for use with a ground plane?

I have a commercially manufactured ground plane antenna for 2 meters. It will be fed with about 150 feet of RG 8/U . I've seen pictures of a coil of the feed line going to a 2 meter ground plane; this ...
1
vote
1answer
134 views

Baofeng UV-5R transmitting to Baofeng BF888s - 888s will not receive transmission unless holding “mon”

so i have just received today a baofeng uv-5r that i had ordered, i already had the 888s after programming the uv-5r to the same frequency as the 888s, i am able to recieve transmission all LEDs ...
11
votes
4answers
566 views

Calling a friend on simplex

Can someone please help clarify. I have tried searching all over, but almost all of the examples you find online and in books are for calling CQ on HF. I am new to ham radio, and recently got a few of ...
1
vote
1answer
48 views

APRS: What's the `n` in WIDEn-N?

In every description I've found of WIDEn-N, the capital N is described as the "hop count" / "ttl" (comparable to internet ...
3
votes
1answer
41 views

What's the difference between an APRS “item” and an APRS “object”?

What's the difference between an APRS "item" and an APRS "object"? A kenwood manual says Objects have timestamps, items do not. What does that mean, and how should it be used? Also in general: What ...
1
vote
3answers
86 views

GMRS Call Sign for Technician

I have a GMRS License and currently studying for my Technician’s License. Once I pass the exam, can I use my GMRS “Call Sign?”
0
votes
1answer
34 views

Combining two CFU455IT +/-2kHz (4kHz) ceramic filters to get a +/-1.25kHz (2.5kHz) filter for SSB

Can I put two of these cheap (less than 3USD) and common CFU455IT +/-2kHz (4kHz bandwith -6dB ) ceramic filters in series to get a lower bandwidth good for SSB TX? If I'm correct I will get -12dB at +/...
-1
votes
3answers
68 views

Recommended Books For AM/FM (especially AM) Radio Design

I am trying to gain a better grasp of how to build an AM radio receiver. Can you direct me to some books (or other information) that will help?
2
votes
0answers
38 views

Is it possible to show frequency and channel name at the same time on AnyTone 878UV?

On the AnyTone 878UV I can choose to display the frequency or the channel name or frequency (Settings->Radio Set->4 Ch.Name). But seems to me like there's enough screen real estate to be able to show ...
1
vote
1answer
80 views

How to model my rooftop vertical on 4NEC2?

A few months ago I built a coil loaded vertical, and put it on my rooftop. My roof is made of corrugated metal, so I connected GND to it, to act as a ground plane (or is it a counterpoise?). With some ...
4
votes
1answer
51 views

I configured FlDIGI to dislay letters before my PSK31 signal and then I forgot how I did it

Several months ago, before I had a Transceiver that worked, I configured FLDIGI to graphically display the letters QC 13P in the waterfall as a preamble to my PSK31 transmission. I remember I was ...
2
votes
2answers
70 views

coax switches for HF

Like many hams I have several radios and several antennas. instead of constantly connecting and disconnecting coax cables I would like to feed several antennas in to some type of switch so I can ...
0
votes
1answer
53 views

What determines the bandwidth of an FM signal?

With an FM signal, it takes up more room in the radio spectrum presumedly because the carrier frequency is changed. On average what's the width of the FM sidebands? Does the deviation from the center ...
3
votes
1answer
73 views

How do I use a signal generator + oscilloscope to measure feeder length?

I could relatively easily take the feeder down and use a tape measure but it’s more of a challenge to learn how to measure the length using my oscilloscope -Red Pitaya - but I have to admit I have no ...
2
votes
5answers
177 views

How to make an RF probe for accurate power measurement at QRP power levels?

Typical SWR meters don't measure forward power very accurately at the lower end of the scale, which can be a real problem at QRP power levels. Better power meters like the Bird model 43 are expensive,...
0
votes
4answers
137 views

Building an AM Radio receiver

I am making an AM radio with the specifications of: Part 1. Design a circuit with an antenna for tuning your receiver to a signal of a specific carrier radio frequency so that you can select a certain ...
1
vote
1answer
135 views

Signal power measurement

I have a radio with a nominal output of 1-30mW (frequency dependent) and amplify this with a 21.8dB capable amplifier (frequency dependent, but should be ~150mW). The signal output then passes through ...
2
votes
5answers
114 views

Optimal length of HT antenna for VHF UHF and diminishing return

I see folding antennas of various lengths that people are using for for their HT. My question is about the optimal length. I know it may "depend" on many factors so let me know if I need to provide ...
3
votes
2answers
1k views

How does FM station have fixed frequency when FM modulation changes the frequency?

I am not sure if this question fits better in physics.stackexchange or ham.stackexchange, feel free to correct me. I am new to studying RF and SDR in general, I was looking up how modulation works and ...
4
votes
1answer
89 views

Why does damping between two antennas increase with frequency?

While studying for a HAM license exam I ran into a question that I am having trouble with answering. There are two aspects that I cannot explain, given my current admittedly little understanding of ...
2
votes
1answer
62 views

Baofang uv-5rA/ repeater trouble

I programmed my Baofang UV-5RA radio to my local repeater about less than a 1/4 mile away. When I cue the mic and release, I get a signal from the repeater. However, I can only hear people if I have ...
1
vote
1answer
19 views

Ten Tec Argo IV wont connect to Fldigi on R Pi

Cannot connect to Raspberry Pi with Fldigi, ttyusb0 does not show up in any cat control functions. I can connect my TS590S to the Pi and I can connect the Ten Tec to any window machine. But I cannot ...
0
votes
1answer
58 views

FT450D no cw tx unless ppt is held

FT450D in cw mode does not transmit unless PTT is actuated. "BK-IN" not in display despite pressing function followed by vox/store button.
1
vote
2answers
111 views

What frequencies in 118–173 MHz can I transmit on without a license in Canada?

I have a Kenwood TM-261. It has the frequencies from 118 to 173 MHz. What frequencies can I transmit on without a licence?
1
vote
0answers
39 views

LA1185 FM downconverter shows weird behavior

I've built FM CCIR/OIRT downconverter based on Sanyo LA1185 IC. I've used most famous schematics for it with slight modification (added DC blocking capacitor 1 nF rated on the output) Coils L1 and L2 ...

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