OK, so that is good value for money then!!
Posts by PA0P
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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
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Hi Kurt,
You are running behind the market. Pick your choice from already available solutions:
F6BVA - 20W with MW7IC2725N, DIY project
SG Lab - 20W with PA2400, readily built
Rene PE1CMO - 20W with BLM2425, readily built
Further options are: the 30W Spectrian driver board readily built with small mod to do, the Andrew MRF21045 modules with15-20W (with mod to do) and several other UMTS boards.
For sure there will be more designs applicable.
73 de Cor
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I've done a look in the datasheet, think i have to modify the value of the input and output C's.
chances for success are low, I did run just by accident into the following article about the same problem:
https://groups.io/g/UKMicrowaves/message/47995.
maybe you can use the board with another type of MMIC for better results.
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Roberto,
The module is a class A configuration with low IMD, no worries for SSB though.
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interesting PA 3 WATT I am preparing I wanted to know from Cor PA0P if possible have the schematic I wanted to do it and how much power should the module insert?
73 de iw5bsf Roberto
Hi Roberto,
Schematic is very simple. As per datasheet do not drive more than 5 mW at the input (50 ohm), put 12 to 28 Volts on pins 2 and 3 depending on the output you want and output is at pin 4 (50 Ohm).
See the photograph for the decoupling of the powerlines. Take several values of capacitors, I did 22pf, 5000pf and 100nf. Any series inductor from the junkbox will do.
Take attention to get a good ground connection, remember it is 2.4GHz...
