Hi Roberto,
So it does work now! You can drive the module a little bit harder than 4 dBm, VSWR will not be 1 at input.
Good luck,
Cor
Posts by PA0P
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Hello Roberto,
If the module is not oscillating, the decoupling will be OK..
Do you have placed via's in the connection board to ensure the top copper is connected to the ground?
I did solder copper tape around the edges and placed copper under both the connection board and module.
Maybe you can add a copper strip between the module screw at the output side and the connection board.
Succes!
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A pity to read your experience. Normally this module does not give any problems. Essential however is a good grounding,
I used thin copper foil under module as well as the board. see my earlier photo.
My module easily outputs 2.5 Watts without overdriving the input.
I experimented with a trimmer at output, but that is really not necessary.
73 de Cor
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See movie I posted above !
Sorry Remco, too complicated.....
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I had to dig deep into my archives, but did find the modification I made long ago to my TS-811E for driving a 70cm linear.
It was based on an article by DJ7ZZ, which cannot be found now anymore on the internet, so herewith a PDF copy.
Also I did find 2 photographs of my actual modification, a small PCB just above a DIN connector.
In contrary to the article I did put the PTT line on the new to mount ACC1 connector.
So easy to do, good luck!!
73 from Cor
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OK, so that is good value for money then!!
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Great job. I try MRF21030 and MFR21045
Do you have any indication of the actual output power of the MFR21045??
Cor
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Mike,
Look for a step recovery diode on eBAY, gives great harmonics result for 5 dollars.
73 de Cor
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Hi George,
Yes, you are close. It are combined L/C's. So wideband filters.
But any ferrite bead L will do also.
Good luck!
73 de Cor
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Here you can order 10 pcs for 10 dollar. Passband is 728-746 MHz.
https://www.ebay.com/itm/Tai-S…01e778:g:gw0AAOSwB3ZcwG2y
73 de Cor
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Thinking out of the box you can do it also this way, see photo....
Alternatively search for an old Stolle rotor in which the pipe can be put through.
Of course it all is depending on the antenna system you will be using.
73 de Cor
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This is the closest available version. Manufacturer is Global Invacom, you always can contact them direct!
https://www.gionlineshop.com/Downloads/DBS_UniSingle.pdf
73 de Cor
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Display MorePerhaps this is costwise a better alternative? Delivered from the UK.
IF frequency 122 MHz so ideal for the SDR. Antenna can be replaced by a N connector if wished so.
https://www.ebay.com/itm/MMDS-…Swqu9Uz7bU&frcectupt=true
73 de Cor
In the attachment of this article you will find a detailed modification description of the xtal and input filters for 2300-2450 MHz.
https://www.hamforum.nl/viewtopic.php?t=1943
Success, Cor
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Friends, which PA do you recommend for broadcasting in WB?
See my thread Wideband High Power PA for 2.4GHz
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Maybe interesting when you are looking for a serious video system?
Models up to 500 Watt available.
https://www.alibaba.com/produc…ylikeexp.5.5d565ab002Gm84
73 de Cor
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Hi Frank,
This overview contains a description and internal picture of the Megasat Multifeed. But it sadly is a DRO model..........
http://www.pabr.org/radio/lnblineup/lnblineup.en.html
73 de Cor
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PA0P Cor do you have this already??
Heiner,
Yes, do have for several years a few MMDS downconverters,, including this one model. They are easy to convert by changing the Xtal and tuning the filters.
Did use them for AO40 and regular 13cm reception.
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Perhaps this is costwise a better alternative? Delivered from the UK.
IF frequency 122 MHz so ideal for the SDR. Antenna can be replaced by a N connector if wished so.
https://www.ebay.com/itm/MMDS-…Swqu9Uz7bU&frcectupt=true
73 de Cor
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someone was having a better result with the 1 watt board:
Hi Richard,
I have removed all shunt caps and things got a wee bit better. I then added 1p at the device in and out and now have about 9 dB gain at 2.4 GHz at 400mW.
I may leave it this way for the moment but i think i will be taking a knife to the wider part of the lines on the input and output.
Geoff GI0GDP
So keep on trying!! Cor
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For the Spectrian driver board owners in this thread pointing to low output level, please note this rather simple mod to achieve over 30W at 2.4GHz.
It comes from a message by VK4OE (remember the Aussies do use 2.4 as their normalcommunications band). Here a copy of the message:
Hello Colin and other readers.
I feel that I can't assist your problem any more than the help you've already received. But I wanted to add that I do have one of these amplifiers working perfectly well at 2403 MHz, the centre of amateur activity here in VK.
However, I did go through the whole amplifier chain trying to find locations for solderable tabs ("snow flaking"), hoping to make it work better at this further-out-of-band frequency. The interesting thing is that I did find one sensitive/responsive point and it was between the final device and the output port, where the microstrip track takes a left hand turn - see attached 'image.
At 2403 MHz, 10 mW input delivered 31 Watts output following this small addition.
It was also interesting that there seems to be a layer of some plastic material everywhere which has to be melted away before the solder will 'take' - it makes the resulting soldered joint less than good looking!
I wish you well with rising to your challenge!
--Doug Friend, VK4OE.
Success!!
73 de Cor
