pa3emy.blogspot.com

Homebrew 144 MHz transceiver

Homebrew 144 MHz transceiver. Homebrew of a 144 MHz FM transceiver using PLL synthesizer. Sunday, October 3, 2010. On the web I have found a lock detector circuit for the 4046. I may build this someday. For Now I use a TX delay when repeaters are used. A good low noise preamp may help to improve sensitivity. The sensitivity is not bad but my yeasu is better. I hope the sensitivity can reach the same level. Then I can use the repeater in Bregen op Zoom PI3BOZ. Friday, June 11, 2010. Tuesday, June 8, 2010.

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Homebrew 144 MHz transceiver | pa3emy.blogspot.com Reviews

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Homebrew 144 MHz transceiver. Homebrew of a 144 MHz FM transceiver using PLL synthesizer. Sunday, October 3, 2010. On the web I have found a lock detector circuit for the 4046. I may build this someday. For Now I use a TX delay when repeaters are used. A good low noise preamp may help to improve sensitivity. The sensitivity is not bad but my yeasu is better. I hope the sensitivity can reach the same level. Then I can use the repeater in Bregen op Zoom PI3BOZ. Friday, June 11, 2010. Tuesday, June 8, 2010.

<META> KEYWORDS

1 minor adjustments

2 posted by

3 luuk

4 no comments

5 fm deviation increased

6 subtones and repeater

7 labels subtones repeater

8 progress

9 light on display

10 qsos

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minor adjustments,posted by,luuk,no comments,fm deviation increased,subtones and repeater,labels subtones repeater,progress,light on display,qsos,pll spurious,harmonics 2,calculated values are,spurious 2,status,abandoned concept,labels fm modulator,labels

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Homebrew 144 MHz transceiver | pa3emy.blogspot.com Reviews

https://pa3emy.blogspot.com

Homebrew 144 MHz transceiver. Homebrew of a 144 MHz FM transceiver using PLL synthesizer. Sunday, October 3, 2010. On the web I have found a lock detector circuit for the 4046. I may build this someday. For Now I use a TX delay when repeaters are used. A good low noise preamp may help to improve sensitivity. The sensitivity is not bad but my yeasu is better. I hope the sensitivity can reach the same level. Then I can use the repeater in Bregen op Zoom PI3BOZ. Friday, June 11, 2010. Tuesday, June 8, 2010.

INTERNAL PAGES

pa3emy.blogspot.com

1

Homebrew 144 MHz transceiver: pll spurious

http://www.pa3emy.blogspot.com/2010/05/pll-spurious.html

Homebrew 144 MHz transceiver. Homebrew of a 144 MHz FM transceiver using PLL synthesizer. Tuesday, May 25, 2010. The pll produces a signal between 133.3 and 135.3 MHz.This signal had some spurious 2MHz away from the carrier. I found out that it was caused by a 132.3 MHz signal. This signal leaked to the vco via the power lines. I fixed this. Now I don't see any spurious around the carrier.So it is attenuated at least 60 db. 1323 MHz is used to downmix the vco signal from 133.3-135.3 to 1-3 MHz.

2

Homebrew 144 MHz transceiver: minor adjustments

http://www.pa3emy.blogspot.com/2010/10/minor-adjustments.html

Homebrew 144 MHz transceiver. Homebrew of a 144 MHz FM transceiver using PLL synthesizer. Sunday, October 3, 2010. On the web I have found a lock detector circuit for the 4046. I may build this someday. For Now I use a TX delay when repeaters are used. A good low noise preamp may help to improve sensitivity. The sensitivity is not bad but my yeasu is better. I hope the sensitivity can reach the same level. Then I can use the repeater in Bregen op Zoom PI3BOZ. Subscribe to: Post Comments (Atom).

3

Homebrew 144 MHz transceiver: October 2010

http://www.pa3emy.blogspot.com/2010_10_01_archive.html

Homebrew 144 MHz transceiver. Homebrew of a 144 MHz FM transceiver using PLL synthesizer. Sunday, October 3, 2010. On the web I have found a lock detector circuit for the 4046. I may build this someday. For Now I use a TX delay when repeaters are used. A good low noise preamp may help to improve sensitivity. The sensitivity is not bad but my yeasu is better. I hope the sensitivity can reach the same level. Then I can use the repeater in Bregen op Zoom PI3BOZ. Subscribe to: Posts (Atom).

4

Homebrew 144 MHz transceiver: Spurious 2

http://www.pa3emy.blogspot.com/2010/05/supurious-2.html

Homebrew 144 MHz transceiver. Homebrew of a 144 MHz FM transceiver using PLL synthesizer. Wednesday, May 19, 2010. My new spectrum analyzer shows the same spurious signal levels the PRC-100 does. So they are real. I got rid of one of the strong spurious signals. It was caused by oscillation. A different problem is the PSU. The transformer can not deliver the current needed for 5 watt output. In fact it can deliver it but it gets too hot and voltage drops too much. Subscribe to: Post Comments (Atom).

5

Homebrew 144 MHz transceiver: progress

http://www.pa3emy.blogspot.com/2010/06/progress.html

Homebrew 144 MHz transceiver. Homebrew of a 144 MHz FM transceiver using PLL synthesizer. Thursday, June 3, 2010. I bought a CTCSS kit on ebay. It has not arrived yet. Building/programming one myself should not be a problem, it just takes some time. I want continue with other projects so I took a shortcut. The xtal IF filter used is 25 KHz wide so I should support FM normal. Subscribe to: Post Comments (Atom). FM deviation super VXO. Low pass filter 2 meter. Pll synthesizer 144 MHz.

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pa3emygeneric.blogspot.com

PA3EMY: December 2011

http://pa3emygeneric.blogspot.com/2011_12_01_archive.html

PA3EMY Ham radio activities. Wednesday, December 28, 2011. I finally found some time to work on the transverter. Now the transverter/cb radio is able to receive 160-10 meter. It consists of the folowing parts:. LO: sdr kits si570 vfo. Switchable bandpass filter: comes from russian ham parts. Power supply: Transformer taken from cb power supply. The Mixer is a sbl-1. The LO signal is amplified by a bfy-90 amplifier. This signal drives the mixer. I will give it a try anyway. Subscribe to: Posts (Atom).

pa3emygeneric.blogspot.com

PA3EMY: 80 /20 MHz transceiver fan problem audio problem

http://pa3emygeneric.blogspot.com/2014/09/80-20-mhz-transceiver-fan-problem-audio.html

PA3EMY Ham radio activities. Monday, September 15, 2014. 80 /20 MHz transceiver fan problem audio problem. I have decided to make the transceiver for 80 meter only. I may reconsider but I don't want to spend too much time on this radio. I intend to use it as a signals source for experiments with IRF510 based amplifier for 80 meter. Subscribe to: Post Comments (Atom). Spectrum analyzer using TV tuner. CB to 7 MHz transverter. 50 MHz SSB transceiver. 144 MHz FM transceiver. View my complete profile.

pa3emygeneric.blogspot.com

PA3EMY: September 2014

http://pa3emygeneric.blogspot.com/2014_09_01_archive.html

PA3EMY Ham radio activities. Monday, September 15, 2014. 80 /20 MHz transceiver fan problem audio problem. I have decided to make the transceiver for 80 meter only. I may reconsider but I don't want to spend too much time on this radio. I intend to use it as a signals source for experiments with IRF510 based amplifier for 80 meter. Subscribe to: Posts (Atom). Spectrum analyzer using TV tuner. CB to 7 MHz transverter. 50 MHz SSB transceiver. 144 MHz FM transceiver. View my complete profile. 9 MHz if strip.

pa3emygeneric.blogspot.com

PA3EMY: February 2014

http://pa3emygeneric.blogspot.com/2014_02_01_archive.html

PA3EMY Ham radio activities. Sunday, February 16, 2014. I have a new toy. A HP spectrum analyzer that works up to 350 MHz. I already own a spectrum analyzer. It is an Atten that works from 0 to 1000MHz. It only has 1 filter that is more than 200 KHz wide. It is usable but this HP is much better. Saturday, February 15, 2014. Two years ago I bought a Kenwood TR7200. It is a well know 2 meter FM radio. It uses xtals. I did not use it much as I only have 2 channels that are usable. In CW mode the signal does...

pa3emygeneric.blogspot.com

PA3EMY: CHN 80-20 tranceiver continued

http://pa3emygeneric.blogspot.com/2014/03/chn-80-20-tranceiver-continued.html

PA3EMY Ham radio activities. Saturday, March 1, 2014. CHN 80-20 tranceiver continued. I fixed the problem with the RIT. It was wired incorrectly. The TX/Rx leds now work for both 80 and 20 meter. These too were wired incorrectly. Somehow I made shortcircuit somewhere. This blew a BD137 power transistor. Fortunately I had a few more in the junk box. At 80 meters I was able to get a bit more than 10 Watts CW. SSB however was at 3 Watt max. Subscribe to: Post Comments (Atom). Spectrum analyzer using TV tuner.

pa3emygeneric.blogspot.com

PA3EMY: chn-8020 transceiver

http://pa3emygeneric.blogspot.com/2014/02/chn-8020-transceiver.html

PA3EMY Ham radio activities. Thursday, February 6, 2014. I just bought a defect chn-8020 transceiver from a fellow ham. The transceiver is a home made transceiver designed in 1980? By PA0CHN It covers 2 bands, 20 meter and 80 meters. ssb/cw 10W output. IF is 9 MHz.'. It iused to be popular here in the netherlands. This unit was not in a good state. It needs a lot of work. It was not completed by the builder. It was not build by the ham I bought it from so its history was unclear. CB to 7 MHz transverter.

pa3emygeneric.blogspot.com

PA3EMY: November 2012

http://pa3emygeneric.blogspot.com/2012_11_01_archive.html

PA3EMY Ham radio activities. Monday, November 19, 2012. It has been a long time since I have used digital mode. So I bought a signalink usbinterface. Now I can make a restart in digital modes. An old pentium PC was available for the coding and decoding. The transceiver I use is an old ICOM IC-730. I also have an IC-817 this one works ok but the IC-730 has a better receiver. The modes That I use are: WSPR, PSK31, JT65 and ROS. Below is a picture of a part of the shack. Subscribe to: Posts (Atom).

pa3emygeneric.blogspot.com

PA3EMY: TR7200

http://pa3emygeneric.blogspot.com/2014/02/tr7200.html

PA3EMY Ham radio activities. Saturday, February 15, 2014. Two years ago I bought a Kenwood TR7200. It is a well know 2 meter FM radio. It uses xtals. I did not use it much as I only have 2 channels that are usable. The other xtals were for USA frequencies in the 146 MHz range. Now I bought some xtals for it. Now I can use the following frequencies. Subscribe to: Post Comments (Atom). Spectrum analyzer using TV tuner. CB to 7 MHz transverter. 50 MHz SSB transceiver. 144 MHz FM transceiver. 9 MHz if strip.

pa3emygeneric.blogspot.com

PA3EMY: March 2011

http://pa3emygeneric.blogspot.com/2011_03_01_archive.html

PA3EMY Ham radio activities. Sunday, March 6, 2011. Capacitors still cause problems. I made series circuit using 3 capacitors. Then I used 3 of those circuits parallel. Unfortunately they still get too hot . So I switched to 400 Volt mks capacitors. Those too get too hot. I found out on a forum that I need polypropylene types. Next week I will try to buy them. I hope the local store sells them. Subscribe to: Posts (Atom). Spectrum analyzer using TV tuner. CB to 7 MHz transverter. 50 MHz SSB transceiver.

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pa3emy.blogspot.com

Homebrew 144 MHz transceiver

Homebrew 144 MHz transceiver. Homebrew of a 144 MHz FM transceiver using PLL synthesizer. Sunday, October 3, 2010. On the web I have found a lock detector circuit for the 4046. I may build this someday. For Now I use a TX delay when repeaters are used. A good low noise preamp may help to improve sensitivity. The sensitivity is not bad but my yeasu is better. I hope the sensitivity can reach the same level. Then I can use the repeater in Bregen op Zoom PI3BOZ. Friday, June 11, 2010. Tuesday, June 8, 2010.

pa3emycb2ham.blogspot.com

CB to Ham transverter

CB to Ham transverter. Attempt to design and build a multiband transverter to CB. Vrijdag 22 mei 2015. After some refinements The transvertor is usable. However I am not satisfied with its performance. So I will need to make more adaptions. At some bands edges the harmonic suppression is not good enough. Fortunately the ssb part of the bands are usable. The CB radio has no CW anyway. The receiver works quite well, even on the crowded 40 meter. SSB TX signal sounds good. Maandag 6 oktober 2014. It was int...

pa3emygeneric.blogspot.com

PA3EMY

PA3EMY Ham radio activities. Thursday, March 10, 2016. On ebay I found a 45 watt amplifier kit. It was really cheap so I bought it. I will describe my findings here. The specifications looked good. 45 watt or more on the lower HF bands and still 25Watt at 10 meter. I was skeptical about this. It uses 2 IRF-530 Fets. On internet I did not find an IRF-530 base amplifier that was able produce that output on 10 meter. The schematic comes from a more recent version of the manual I found later. These levels ar...

pa3emyspectrumanalyser.blogspot.com

Homebrew spectrum analyzer

Construction of spectrum analyzer using UDT-401 tuner. Dinsdag 8 juni 2010. Strong harmonics are created internally when the signal level is high. Signals must be attenuated 20 db. This reduces dynamic range to 50 db. So, although dynamic range is 70db , only 50 db is available for measuring harmonics. I am adding dipswitches to the processor board. They will be used to set the calibration points for the horizontal calibration. Vrijdag 21 mei 2010. Zondag 16 mei 2010. Putting modules in box. Secure mains...

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