This is my third attempt to post this message. It seems that the AMSAT-BB blocks messages with JPEG attachments. Below is a Google translation of the article on the 23cm transceiver inDKARS magazine.
Mac Cody / AE5PH
VHF-UHF-SHF News This month provided by Hans van Alphen, PAØEHG
Nice new transistor for 23 cm PA
Since the beginning of this year NXP has a nice power LDMOS transistor in the range for the 23 cm band. The transistor type: MRFE8VP13350 assumes pre-matched adaptation and is designed for industrial, scientific and medical applications. The transistor is capable of supplying 350 watts in the frequency range 700 to 1300 MHz, which is also ideal for our 23 cm band. With a typical LDMOS supply voltage of 50 volts, approximately 10 to 14 amps is required to get the 350 watt output with a control of 8 watts, a comfortable 16 dB gain.
Italian Technology Broadcast offers 490 Euro ex VAT a module for sale consisting of a built pallet with all parts on it and a copper base of 9.5 mm thick that needs to be mounted on a cooling plate.
Further information and how to order this unit can be found via: http://vhelectronics.sk/index.php/en/rf-modules-and-boxes/alx-350-detail
For those for whom this power is not yet sufficient, NXP has also announced a bigger brother, the MRF13750H, which can deliver an output of no less than 750 Watts in the band from 700 MHz up to and including 1300 MHz. With almost 20 dB gain, approximately 10 Watts is sufficient to send the transistor. This transistor will probably soon be on the market and possibly also as a complete one power pallets become available. Data from this transistor can be found at: https://www.nxp.com/docs/en/data-sheet/PRF13750H.pdf
70 cm EME with only 10 watts On 2 December 2017, the M6EBQ succeeded in making a 70cm EME QSO with DL7APV with only 10 Watt output. The connection in WSJT was made with 10 W output from a Yeasu FT857 and as antenna a DG7YBN 70-17m 17 element Yagi.
The antenna used to design by DG7YBN uses a flat folded dipole with which very favorable characteristics can be achieved.
The antenna has the property that the side lobes at the back are very well suppressed and thus a very good front-rear ratio for the length of this antenna.
With 3.63 meters in length and a gain of 17.3 dBi and a front-back ratio of no less than 38 dB, this is also a very suitable antenna for contests. Of course, therefore, there is also little noise picked up and the antenna is also very suitable for moonbounce.
Information on how to make this antenna can be found at: http://dg7ybn.de/432MHz/GTV70_17m.htm
On 01/26/2018 01:43 PM, Brad Brooks wrote:
For those who receive the DKARS magazine, there is a very interesting article. The transceiver described is for ATV, but it looks like like it will tune to the AO-92 uplink frequency. Seems to put out 400mw FM out. I am not able to take time now to review deeper (stealing away from work) but I look forward to parsing through the schematic/links this weekend. I am forwarding this notice for anyone who will be able to get there sooner. I think there is some potential here, and I would like to know other’ opinions.
73 Brad WF7T Nashville TN EM66 _______________________________________________ Sent [email protected] AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings:http://www.amsat.org/mailman/listinfo/amsat-bb