Glenn W9IQ
  • Member for 4 years, 9 months
  • Last seen more than a month ago
How to identify a practical HF communication receiver?
1 votes

When looking at legacy receivers, a key differentiator is often general coverage (shortwave) vs amateur radio coverage. Most shortwave receivers lack the band spread, selectivity, filtering and ...

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Why do the metres seem to be increasing with frequency?
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8 votes

It is simply an error or typo on that website. Take a look at the companion color chart on that page that is provided by the ARRL. It shows that frequency range as 160 meters. The formula for ...

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Pair of Baofeng BF-888s stopped communicating after reprogramming - what to do
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5 votes

One other setting for each channel that may be giving you problems is Duplex/Simplex. Make certain it is set to Simplex or equivalently "no offset". This feature, when turned on, causes that channel ...

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VOX mic that emulates PTT
1 votes

Unfortunately your RT1 radio will not easily support VOX operation. The only control of the PTT is on the main radio or the remote. There is no push to talk (PTT) connection brought out on the radio ...

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How to find something disrupting car key fobs across a parking lot?
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7 votes

There was a similar problem in the US a few years ago and it turned out to be a new shop sign that had a defective ballast that emitted a wide RF spectrum. Most key fob systems operate at ...

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Who has the ability to physically manipulate a repeater's controls?
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4 votes

The owner of the repeater is typically in control of who has physical access. Often the owner will permit the trustee of the station license (in the US) to have access in order to carry out their ...

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Tuning a Homebrew MURS
1 votes

The antenna you reference is referred to as a Moxon antenna. All dimensions of the two elements are frequency dependent. I recommend that you use the AC6LA software to calculate the correct dimensions ...

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Shortwave antenna wire — do I care about "corona discharge"?
4 votes

That is a bit of marketing speak that simply means the insulation on the wire will not permit current to flow under some unspecified differential voltage. The insulation is simply black silicone ...

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Antenna relay switch design
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3 votes

The high temperature and humidity conditions of an attic are dwarfed by the environmental requirements of automotive applications. Picking relays that are rated for automotive use is therefore one way ...

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How large and where should a perimeter ground be installed?
1 votes

A copper ring that encompasses the entire room and is located near the ceiling of the room is typically referred to as a halo ground. This ring is bonded directly to the external, buried ground ring ...

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Will the quantization noise be increased if the step level is increased?
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2 votes

Quantization noise is highly dependent on the signal source distribution and its amplitude, the number of ADC bits, and the use of dithering. For a high resolution ADC that is digitizing a full ...

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Local phonetic alphabets
4 votes

I enjoyed your description of phonetics and the Russian language. Thank you for sharing that. I have a friend in Japan that mentioned this. A quick check on Wikipedia yielded: The Japanese ...

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Long range communication with just 1W of power?
4 votes

At 27 MHz and a distance of 1000 km, propagation will be the main determinant of the possibility of communications. Propagation will primarily be a factor of time of day and the sun spot conditions. ...

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mixing frequency of intermediate frequency (IF) and radio frequency (RF)
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3 votes

Your answer in your question is not correct. This question is solved in the same way as the last question you asked. The formulas are the same: $$f_s=f_1+f_2 \tag 1$$ $$f_d=f_1-f_2 \tag 2$$ This ...

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Measuring S21 against TX-RX distance (a.k.a path loss modelling) with a network analyzer didn't give expected results
1 votes

I would suspect that the primary reason for the seemingly odd results is that you are likely operating the experiment in the near field of the antennas. As your distance changes, the mutual coupling ...

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Is it possible to transmit and receive FSK G3RUH using SSB transceiver operating on USB-D?
1 votes

In short, this is generally not permitted on HF. The G3RUH FSK proposal dealt with sending 9600 baud packet data over a 4800 hertz wide channel. The envisioned application was on VHF and UHF FM radios....

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Frequency mixing products
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7 votes

When two sinusoidal signals are multiplied through a non-linear mixer circuit, it results in the sum and difference of the mixed frequencies: $$f_s=f_1+f_2 \tag 1$$ $$f_d=f_1-f_2 \tag 2$$ Of course, ...

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Another Yaesu G-5400B output voltage question
1 votes

It is unlikely that both op amps have failed, especially since the other half of each op amp drives the meters, which you stated are still working properly. I am initially concerned that you are ...

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Embedded Message on Zastone ZT-X6 / WLN KD-C1
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2 votes

An embedded message allows you to leave a user defined artifact in the memory of the radio that can be recalled by the programming software. This can be used for things such as to identify the ...

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How many HF (FT8/JT65/BPSK/RTTY etc) amateurs are active in Canada?
2 votes

If there is any merit to your claim, consider that Canada has ~ 69,000 hams while the US has ~800,000 hams according to Wikipedia. With less than 10% of the number of hams in Canada compared to the US,...

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Unlicensed TV broadcasting power limit (Band I)
2 votes

Yes, you may broadcast (called an "intentional radiator") video transmissions but only on unused TV channels 14-51 (UHF, not VHF) as so called "white spaces". Read Part 15 ...

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How to model passive elements when simulating an antenna?
3 votes

Without any insight into the design of your program, I can only offer some basic guidance. The parasitic elements in a yagi design are shorted dipoles that can also be modeled as a collection of ...

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Multi-band Crystal Receiver?
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4 votes

A crystal radio generally consists of a simple LC network and a diode detector. So in theory, altering the LC network would allow you to tune higher frequencies. The real issue is that signals you ...

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Share wide band antenna with multiple transceivers
8 votes

The basic concept is to use RF bandpass filters for each frequency range. This is frequently done by hams for VHF and UHF applications. The common term for a grouping of these filters is diplexer, ...

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What would the power at output at a distance of 1cm when transmitted at a power of 1dBm from the transmitting antenna?
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1 votes

A couple of observations based on your post here and Physics SE. Your choice of antennas is a significant compromise. These are not balanced antennas so your coaxial cables will easily function as ...

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How do antennas behave as they are moved to near-field distances?
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3 votes

How do antennas behave as they are moved to near-field distances? The near field zone of an antenna consists of highly reactive fields that can easily couple to nearby conductive objects. As a ...

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What is the advantage of making an antenna resonant?
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8 votes

Resonance or non-resonance does not have a direct effect on the efficiency or gain of the antenna. A resonant antenna is one that has only resistance without any reactance (capacitive or inductance) ...

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Partially Collapse Telescoping Antenna to Change Effective Length
0 votes

Radio frequency currents flow largely along the surface of a conductor due to skin effect. As a result, the center portion of a conductor typically plays no role in the conduction of RF current. The ...

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6 meter mobile antenna grounding
1 votes

The bonding of automotive panels and structures is generally done to reduce RFI that can affect in-vehicle electronics. On 6 meters, this may not be at all necessary but you will not know until you ...

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How can I get rid of RFI coming from my house solar panel inverter?
8 votes

The inverter in your solar panel system utilizes a high frequency switcher to regulate the voltage and convert it to AC for feeding back into the mains. Some solar panels also use an "optimizer&...

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