Amateur Radio Stack Exchange
Amateur Radio Stack Exchange

Most Popular

more tags
1500 questions
4
votes
2 answers

What is the difference between Yaesu noise blanker (analog IF) and Icom noise blanker (perhaps digital)

What is the difference between the Yaesu (say FT DX 5000) and Icom (say IC 7700) noise blankers? I understood that the Yaesu NB is an analogue one while Icom uses a digital solution.
Nicola
  • 41
  • 1
4
votes
1 answer

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. When the wide filter is selected, this crystal…
user885
4
votes
2 answers

AX.25 to Kenwood $PKWDWPL sentence

In my vehicle, I have a Byonics TinyTrac4 paired with an AvMap G6. I also have a Kenwood TM-D710 that I'm currently using for voice. I live in a region of the US where both 2m APRS and 70cm High Speed APRS are in common use, and am interested in…
KD7KUJ
  • 181
  • 1
  • 5
4
votes
2 answers

Resistive impedance with frequency

Full disclosure, I'm a little dyslexic. Concepts that are easy to most people usually seem ambiguous to me. I also have a had time expressing myself through writ so please forgive me if this seems like an odd question. I've been reading my ARRL…
Turingrad
  • 75
  • 4
4
votes
1 answer

Using a flip-phones GPS NMEA data for the GPS in an APRS station

I have heard that it is possible to connect certain flip-phones to external devices via their Micro USB port and, through the USB port, send the NMEA location Data from their internal GPS to an external device. I am wondering if it would be possible…
W8AWT
  • 1,326
  • 2
  • 13
  • 32
4
votes
1 answer

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 port to read frequency, RIT, voltage, etc. I…
Terrance Leach
  • 41
  • 2
4
votes
2 answers

Does antenna width/shape affect resonant frequency like length does?

I was wondering if I made an antenna from a Rohn 25G tower, would it have the same resonant frequency as a pole of the same height (assuming guys are insulated)? Also with the Rohn antenna, the waves would be both vertically and horizontally…
Synaps3
  • 425
  • 2
  • 12
4
votes
1 answer

What am I responsible for on my link?

I have set up an AllStar link system to a repeater depicted in the picture below: The repeater is under NØMHU's call, and my node is under me, KDØWHB. With permission, I service EchoLink and AllStar to the machine for wide coverage access. I am…
Skyler 440
  • 7,600
  • 7
  • 49
  • 89
4
votes
0 answers

Why the value of IF of AM is 455 kHz?

Why the value of intermediate frequency (IF) of amplitude modulation (AM) is 455 kHz? Why not another value?
Wei-Cheng Liu
  • 141
  • 2
4
votes
4 answers

Counterpoise for telescopic antenna AL-800 as a portable/base antenna on 70cm?

Recently I bought a telescopic antenna, model AL-800: http://www.pryme.com/index.php?l=product_detail&p=2155 It is 863mm (34 inches) long when fully extended. When retracted, it is 785mm long. Will adding, for example, 4 ground radials increase the…
Marc
  • 41
  • 2
4
votes
1 answer

Asynchronous vs. Synchronous data transmission speed

Humans are asynchronous receivers, they can pick up words at any time, even if spread out, can combine into a sentence. Data rates are as fast as someone can hear/talk/copy code. All of the fast digital modes are Synchronous, example the HF digital…
Skyler 440
  • 7,600
  • 7
  • 49
  • 89
4
votes
1 answer

How to make an inductor?

I am a high school student and am making a project on FM receiver for class 11. I am following this circuit diagram: The L2 in this diagram is a 22µH RF Choke. The part listed in the website has the configuration provided below in its datasheet. L=…
Aniruddha Sarkar
  • 143
  • 3
4
votes
2 answers

Recommendations for starting out with HF for an amateur

I'm a beginner who's nearly half a year from receiving my ham license in India. I want to start with HF radio and wish to build my own rig. Currently I have looked and multiple designs using the ad9860 module. Also I live in a city and know very…
Parth Sane
  • 141
  • 6
4
votes
2 answers

Longest achievable ground wave range on 40-meter bands

What is the longest possible range on the 40-meter band by ground wave? A reference said we can achieve 150 miles at 8 MHz with only a 100 watt transmitter. It also says on 160 meters, the ground wave may extend to more than 900 kilometers. Is this…
abduoman11
  • 213
  • 2
  • 9
4
votes
2 answers

Why is SNR for FT8 defined using the noise power in the 2500 Hz channel containing the FT8 signal?

I see the term "SNR_2500" is often use to make it clear. Is it useful to use this SNR definition in some contexts? Is this kind of convention used in other digital modes or communication systems? Edit to add: I should have made it clear that my…
gschro
  • 157
  • 5
1 2 3
…
99 100