The radio is now working and receives very well AM stations. No hum but there is "motorboating" that disappears when the volume knob is turned close to maximum. When the volume is lowered "motorboating" appears again. I checked the volume control variable resistor with the ohmeter and seems to be ok. Three of the tubes (77, 78 and 6A7) have ...
Motorboating; what is it, 'why?', and how to fix it?
Motorboating is a low frequency oscillation, often due to feedback though the power supply. Coupling caps shouldn't be too big, power supply filters may have to be larger if your supply has more droop than Fender's original. The original 5E2 circuit used 22K and 8 uF for the filter to the two 12AX7 stages - you may have reduced that resistor ...
Motorboating (electronics)
In electronics, motorboating is a type of low frequency parasitic oscillation (unwanted cyclic variation of the output voltage) that sometimes occurs in audio and radio equipment and often manifests itself as a sound similar to an idling motorboat engine, a "put-put-put", in audio output from speakers or earphones. [1][2][3][4] It is a problem ...
What causes "motorboating"?
Tucson, AZ. Dec 27, 2008. #11. Skypilot007 said: ...If you're getting the motorboating sound for an entire transmission then its probably a weak signal on that particular voice channel that your scanner is not decoding. This sounds like what is most likely happening.
Motorboating: What exactly is it?
Motorboating is a low frequency oscillation. There are numerous causes. Many are related to capacitors or high impedance power supplies (flat batteries). You need to look at the supply rails to see if they are fluctuating in time to with the motorboating because one cause is coupling between the amplifier and the power supply -- this can ...
Motor-boating Noise on HF
Caution! If you purchase a QRM Eliminator, you must not run more than 100W through it. I run a maximum of 100W, for 60m, and for the rest of the bands I am ...
PDF No. 23
No. 23 - How To Fix a Receiver That Squeals and Motorboats. Title. No. 23 - How To Fix a Receiver That Squeals and Motorboats. Author. NRI - National Radio Institutes, 1949; Scanned by Mike Yancey, 2012. Subject. No. 23 - How To Fix a Receiver That Squeals and Motorboats. Keywords.
What is mean by "motorboating"?
271. Location. Smyrna, Tennessee. Jul 15, 2010. #6. zz0468 said: "motorboating" is a low frequency oscillation that resembles a motorboat putt-putting along. The term predates anything digital by about 6 decades or so. Did motorboating have the same meaning BEFORE digital, but not caused by digital apparatus?
DMR RF (motorboating) on TNC circuit : r/amateurradio
DMR RF (motorboating) on TNC circuit. I have a USB sound card that feeds audio into two el-14 1:1 600ohm audio isolation transformers. The PTT circuit is shown here. I'm getting a strong motorboating effect on DMR. Putting a choke on the kenwood to dual 3.5mm audio cord near the radio did not remove the issue.
Attempting to restore a 1953 Crosley 10-135 All American 5 ...
Attempting to restore a 1953 Crosley 10-135 All American 5 vacuum tube AM radio. General. Replaced all the capacitors and vacuum tubes and removed IF transformers, which are original, but no joy. Still makes motorboat noise with only minor volume control authority.
DMR motorboating issue with external mics : r/amateurradio
That is RF getting into the external microphone. You will fine that a lot of the Chinese microphones have poor shielding. In the mic cable. Some external mics can be fixed by adding a couple of capacitors to the mic circuit. You should be able to google more about it and maybe even find the mode to fix the issue. 3.
Why does MOTOTRBO cause chopper/motorboat/jackhammer sounds?
This is where (in simple terms) the radio only transmits in certain timeslots, not 100% of the time. This results in the radio rapidly switching between transmit and receive very quickly. This pulsed energy comes across as the motorboat sound you hear. You can often hear this if you hold the radio close to a computer speaker and transmit.
Mobile HF HAM Radio
An overview of my attempts at bonding my mobile HF setup for greater antenna efficiency, and other attempts at reducing ignition noise in my RX.HF Mobile Ins...
Forum » RFI
The American Radio Relay League (ARRL) is the national association for amateur radio, connecting hams around the U.S. with news, information and resources. ARRL. Website Search ... DMR Handheld Mic Motorboating. Displaying 1-1 of 1 Jun 20th 2018, 19:53: W9KJO. Joined: Nov 17th 2015, 10:54
Motorboating on Tx audio
Amateur radio firmware for the GD-77, GD-77S, DM-1801, DM-1801A, RD-5R, MD-9600/RT-90, MD-UV380/RT-3S, DM-1701/RT-84 and MD2017/RT-82 radios. Skip to content. ... He also tried the version from last Christmas, and the motorboating on his radio sounded the same. So, at least in his case we can rule out the dimming of a recent change to the ...
Reviews For: Remoterig RRC-1258MkII
Products to be reviewed typically should be tangible ham radio related items such as radios, antennas, towers, test equipment, feedlines, etc. eHam's Product Reviews are intended to provide an opportunity to share an opinion, positive or negative, of a commercially available ham radio-related product or service.
Reviews For: ICOM IC-718
The Icom 718 was my first transceiver when I got my license back in 2017. It was in reasonable shape and I had to replace the DSP unit as the one installed was not working. I found the Icom 718 to be very good, going beyond my expectations for the features offered.
HAM radio Frequencies & Bands in the USA: Popular frequencies with
20 meters band spans from 14.-14.35 MHz. It is the most popular band between Hams and is most busy band during the day. Frequency Range: 14.025 -14.150 MHz. Operating Modes: CW, RTTY/Data. License Class: General class. Frequency Range: 14.225 -14.350 MHz. Operating Modes: CW, Phone, Image.
What Does Motorboating Sound Like?
Joined. Feb 6, 2007. Messages. 6,034. Apr 26, 2008. #5. It's a low frequency oscillation that can sound like someone blowing rasperries, ir can even sound like a very low note played on a tuba. If the frequency is really low, it an sound like a small engine putting.
160-meter band
160-meter band refers to the band of radio frequencies between 1.8 and 2 MHz, just above the medium wave broadcast band.For many decades the lowest radio frequency band allocated for use by amateur radio, before the adoption, at the beginning of the 21st century in most countries, of the 630-and 2200-meter bands. Amateur operators often refer to 160 meters as the Top Band [a] It is also ...
List of amateur radio software
MacLoggerDX is a full-featured amateur radio contact logger for macOS with Transceiver control, Rotor control, Callbook lookup, QSL handling (Hardcopy / LoTW / eQSL / Club Log), DX Cluster and spotting, and basic contesting support. It also works with WSJT-X to control the transceiver while making digital contacts, etc.
Superstar SS-158VDX 10 Meter Amateur Radio
SuperStar SS-158VDX 10 Meter Amateur Radio with AM / FM / SSB Modes & Frequency Counter Visit the Ranger store. All Mode: AM / FM / SSB / CW Auto Dim Display Lights ... With the SuperStar SS-158VDX 10 meter radio you can access AM, FM, Single Side Band, and even CW modes. They offer consistent and stable SSB frequency performance and include a ...
Steve Wozniak: From Ham Radio Enthusiast to Revolutionizing Personal
His early interest in electronics and communication began when he became a licensed ham radio operator. With the callsign WV6VLY, later changed to WA6BND, Wozniak's experience in amateur radio played a vital role in shaping his technical skills and curiosity about how technology can connect people over vast distances.
American Radio Relay League
Find an Amateur Radio License Exam Session. Altus OK 73521-1527 EXAM SESSION. 10/29/2024. Sponsor: Altus Area ARA (AJ5Q) Date: Oct 29 2024 Time: 6:30 PM (Walk-ins allowed) Contact: Ronald S. Roman (580) 471-8050 Email: [email protected] VEC: ARRL/VEC Location: Southwest Technology Center 711 W Tamarack Rd Altus OK 73521-1527. Back. Back to Top ...
Carabao Cup draw LIVE: Arsenal vs Bolton & Liverpool vs West Ham ...
FT: Arsenal 5-1 Bolton - Nwaneri (2), Rice, Sterling & Havertz score for Gunners, who had 16-year-old Porter in goal FT: Liverpool 5-1 West Ham - Jota (2), Gakpo (2) & Salah give Reds thumping win ...
COMMENTS
The radio is now working and receives very well AM stations. No hum but there is "motorboating" that disappears when the volume knob is turned close to maximum. When the volume is lowered "motorboating" appears again. I checked the volume control variable resistor with the ohmeter and seems to be ok. Three of the tubes (77, 78 and 6A7) have ...
Motorboating is a low frequency oscillation, often due to feedback though the power supply. Coupling caps shouldn't be too big, power supply filters may have to be larger if your supply has more droop than Fender's original. The original 5E2 circuit used 22K and 8 uF for the filter to the two 12AX7 stages - you may have reduced that resistor ...
In electronics, motorboating is a type of low frequency parasitic oscillation (unwanted cyclic variation of the output voltage) that sometimes occurs in audio and radio equipment and often manifests itself as a sound similar to an idling motorboat engine, a "put-put-put", in audio output from speakers or earphones. [1][2][3][4] It is a problem ...
Tucson, AZ. Dec 27, 2008. #11. Skypilot007 said: ...If you're getting the motorboating sound for an entire transmission then its probably a weak signal on that particular voice channel that your scanner is not decoding. This sounds like what is most likely happening.
Motorboating is a low frequency oscillation. There are numerous causes. Many are related to capacitors or high impedance power supplies (flat batteries). You need to look at the supply rails to see if they are fluctuating in time to with the motorboating because one cause is coupling between the amplifier and the power supply -- this can ...
Caution! If you purchase a QRM Eliminator, you must not run more than 100W through it. I run a maximum of 100W, for 60m, and for the rest of the bands I am ...
No. 23 - How To Fix a Receiver That Squeals and Motorboats. Title. No. 23 - How To Fix a Receiver That Squeals and Motorboats. Author. NRI - National Radio Institutes, 1949; Scanned by Mike Yancey, 2012. Subject. No. 23 - How To Fix a Receiver That Squeals and Motorboats. Keywords.
271. Location. Smyrna, Tennessee. Jul 15, 2010. #6. zz0468 said: "motorboating" is a low frequency oscillation that resembles a motorboat putt-putting along. The term predates anything digital by about 6 decades or so. Did motorboating have the same meaning BEFORE digital, but not caused by digital apparatus?
DMR RF (motorboating) on TNC circuit. I have a USB sound card that feeds audio into two el-14 1:1 600ohm audio isolation transformers. The PTT circuit is shown here. I'm getting a strong motorboating effect on DMR. Putting a choke on the kenwood to dual 3.5mm audio cord near the radio did not remove the issue.
Attempting to restore a 1953 Crosley 10-135 All American 5 vacuum tube AM radio. General. Replaced all the capacitors and vacuum tubes and removed IF transformers, which are original, but no joy. Still makes motorboat noise with only minor volume control authority.
That is RF getting into the external microphone. You will fine that a lot of the Chinese microphones have poor shielding. In the mic cable. Some external mics can be fixed by adding a couple of capacitors to the mic circuit. You should be able to google more about it and maybe even find the mode to fix the issue. 3.
This is where (in simple terms) the radio only transmits in certain timeslots, not 100% of the time. This results in the radio rapidly switching between transmit and receive very quickly. This pulsed energy comes across as the motorboat sound you hear. You can often hear this if you hold the radio close to a computer speaker and transmit.
An overview of my attempts at bonding my mobile HF setup for greater antenna efficiency, and other attempts at reducing ignition noise in my RX.HF Mobile Ins...
The American Radio Relay League (ARRL) is the national association for amateur radio, connecting hams around the U.S. with news, information and resources. ARRL. Website Search ... DMR Handheld Mic Motorboating. Displaying 1-1 of 1 Jun 20th 2018, 19:53: W9KJO. Joined: Nov 17th 2015, 10:54
Amateur radio firmware for the GD-77, GD-77S, DM-1801, DM-1801A, RD-5R, MD-9600/RT-90, MD-UV380/RT-3S, DM-1701/RT-84 and MD2017/RT-82 radios. Skip to content. ... He also tried the version from last Christmas, and the motorboating on his radio sounded the same. So, at least in his case we can rule out the dimming of a recent change to the ...
Products to be reviewed typically should be tangible ham radio related items such as radios, antennas, towers, test equipment, feedlines, etc. eHam's Product Reviews are intended to provide an opportunity to share an opinion, positive or negative, of a commercially available ham radio-related product or service.
The Icom 718 was my first transceiver when I got my license back in 2017. It was in reasonable shape and I had to replace the DSP unit as the one installed was not working. I found the Icom 718 to be very good, going beyond my expectations for the features offered.
20 meters band spans from 14.-14.35 MHz. It is the most popular band between Hams and is most busy band during the day. Frequency Range: 14.025 -14.150 MHz. Operating Modes: CW, RTTY/Data. License Class: General class. Frequency Range: 14.225 -14.350 MHz. Operating Modes: CW, Phone, Image.
Joined. Feb 6, 2007. Messages. 6,034. Apr 26, 2008. #5. It's a low frequency oscillation that can sound like someone blowing rasperries, ir can even sound like a very low note played on a tuba. If the frequency is really low, it an sound like a small engine putting.
160-meter band refers to the band of radio frequencies between 1.8 and 2 MHz, just above the medium wave broadcast band.For many decades the lowest radio frequency band allocated for use by amateur radio, before the adoption, at the beginning of the 21st century in most countries, of the 630-and 2200-meter bands. Amateur operators often refer to 160 meters as the Top Band [a] It is also ...
MacLoggerDX is a full-featured amateur radio contact logger for macOS with Transceiver control, Rotor control, Callbook lookup, QSL handling (Hardcopy / LoTW / eQSL / Club Log), DX Cluster and spotting, and basic contesting support. It also works with WSJT-X to control the transceiver while making digital contacts, etc.
SuperStar SS-158VDX 10 Meter Amateur Radio with AM / FM / SSB Modes & Frequency Counter Visit the Ranger store. All Mode: AM / FM / SSB / CW Auto Dim Display Lights ... With the SuperStar SS-158VDX 10 meter radio you can access AM, FM, Single Side Band, and even CW modes. They offer consistent and stable SSB frequency performance and include a ...
His early interest in electronics and communication began when he became a licensed ham radio operator. With the callsign WV6VLY, later changed to WA6BND, Wozniak's experience in amateur radio played a vital role in shaping his technical skills and curiosity about how technology can connect people over vast distances.
Find an Amateur Radio License Exam Session. Altus OK 73521-1527 EXAM SESSION. 10/29/2024. Sponsor: Altus Area ARA (AJ5Q) Date: Oct 29 2024 Time: 6:30 PM (Walk-ins allowed) Contact: Ronald S. Roman (580) 471-8050 Email: [email protected] VEC: ARRL/VEC Location: Southwest Technology Center 711 W Tamarack Rd Altus OK 73521-1527. Back. Back to Top ...
FT: Arsenal 5-1 Bolton - Nwaneri (2), Rice, Sterling & Havertz score for Gunners, who had 16-year-old Porter in goal FT: Liverpool 5-1 West Ham - Jota (2), Gakpo (2) & Salah give Reds thumping win ...