[amsat-bb] Potential 23cm FM transmitter
Mac A. Cody
maccody at att.net
Thu Feb 1 01:49:04 UTC 2018
Wish you had mentioned that it was in the January issue (long with a
too) in your original posting.
On 01/30/2018 11:14 PM, Brad Brooks wrote:
> Mac, the arrival I was referencing started on page 20 of the Jan 2018 issue—a number of pages back from the region you quoted from.
> The links at the end of the article point to the following site of Bas PE1JPD, who has a nice single board FM unit that has potential. Looks like he offers his kits for about 158 Euros+shipping: http://www.pe1jpd.nl/index.php/23cm_nbfm/
> 73 Brad WF7T
> On Jan 30, 2018, 7:47 PM -0600, Mac A. Cody <maccody at att.net>, wrote:
>> 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:
>> 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:
>> 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:
>> 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 viaAMSAT-BB at amsat.org. 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
>> Sent via AMSAT-BB at amsat.org. 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
> Sent via AMSAT-BB at amsat.org. 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
More information about the AMSAT-BB