Posts by PA0P

For all owners of ex-telecom Power Amplifiers with 2.1 circulators please note:

There are currently 125 Watt NOVA drop-in circulators for 2300-2400 MHz on offer at eBAY !!

And cheap, about 10 dollar each !! Multiple lots are offered, e.g. for 5 and 12 units, no shipping cost.

Look here: https://www.ebay.com/itm/LOT-o…id=p2047675.c100005.m1851

73 de Cor

It was a sole source product from NXP, which was discontinued end of 2014.

As direct replacement was stated the BLF7G27LS-100,118, of which an Ampleon datasheet can be found on the Internet.

Do assume the spec's will be useful.

73 de Cor PA0P

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

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!

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

Quote from PA3FYM

See movie I posted above !

Sorry Remco, too complicated.....

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

TS811-711 PTT Out DJ7ZZ.pdf

OK, so that is good value for money then!!

Quote from PY1SAN

Great job. I try MRF21030 and MFR21045

Do you have any indication of the actual output power of the MFR21045??

Cor

Mike,

Look for a step recovery diode on eBAY, gives great harmonics result for 5 dollars.

73 de Cor

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

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

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

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

Quote from PA0P

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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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

Quote from IU2KAC

Friends, which PA do you recommend for broadcasting in WB?

See my thread Wideband High Power PA for 2.4GHz

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

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

Quote from DD0KP

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.

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