I am considering to build a simple 1 Watt amplifier.
The Power module is quite expensive. It costs 60 dollar + shipment. I may buy it later.In the mean time I could build a simple 1 Watt amplifier. That should be enough for local qso's. Maybe some DX as well when the conditions are right. Later, at sunspot maximum, I could buy the module. Replacing the 1 watt Amp with the module should be easy. I hope the module is still in stock then.
I have a couple of 2N3866 transistors available. Two of them in push pull configuration should do the trick. I may get a bit more out of them. Two watts may be possible. However the inter modulation may be to high. I will have to try as I don't know how to calculate it.
dinsdag 2 juni 2009
zondag 10 mei 2009
Little progress
Last week I worked on the 144 MHz FM transceiver.
See My 144 MHZ transceiver blog
Not much progress to report on the 50 MHz project this week.
I found out that the 50 MHz power module is available at
rfparts.com
This module is the best option. I have looked at other PA's. Lots of PA's can be found on the internet. Unfortunately a 200 mW in 10 Watt out PA suitable for SSB could not be found.
See My 144 MHZ transceiver blog
Not much progress to report on the 50 MHz project this week.
I found out that the 50 MHz power module is available at
rfparts.com
This module is the best option. I have looked at other PA's. Lots of PA's can be found on the internet. Unfortunately a 200 mW in 10 Watt out PA suitable for SSB could not be found.
dinsdag 5 mei 2009
picture of 200 milli Watt TRX
Here is a picture of the current state of the project.
Top left: Receiver
Bottom left: VXO modulator IF filter
Middle: Preamp
Top right: 200 mW TX driver
Top right: Frequency counter
It has 200 milli Watt output. This should be enough to drive a power module. Those modules are hard to get though so I may have to make a PA myself.
TX and RX work. However more fine tuning is needed.
Top left: Receiver
Bottom left: VXO modulator IF filter
Middle: Preamp
Top right: 200 mW TX driver
Top right: Frequency counter
It has 200 milli Watt output. This should be enough to drive a power module. Those modules are hard to get though so I may have to make a PA myself.
TX and RX work. However more fine tuning is needed.
maandag 27 april 2009
Start of Blog
I am building a 50 MHz SSB transceiver.
It will be a simple one. It will be vxo controlled in a small part of the 50 MHZ ssb band.
Specifications.
-Modulation USB
-Power 10 Watt
-frequency range 100 KHz
The design is made by borrowing parts from other designs. The IF section looks a lot like the BITX tranceiver. I have added AGC. Mixers are replaced by a SBL-1 alike mixer. IF is 6 MHz.
VXO is borrowed from another design. It uses a 22.1 MHz xtal. This signal is doubled.
It will be a simple one. It will be vxo controlled in a small part of the 50 MHZ ssb band.
Specifications.
-Modulation USB
-Power 10 Watt
-frequency range 100 KHz
The design is made by borrowing parts from other designs. The IF section looks a lot like the BITX tranceiver. I have added AGC. Mixers are replaced by a SBL-1 alike mixer. IF is 6 MHz.
VXO is borrowed from another design. It uses a 22.1 MHz xtal. This signal is doubled.
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