I too am struggling with how to get RF out on 1.2ghz. Right now Im leaning toward the SG-Labs 1296 transverter (1296/144) which I think someone mentioned sometime back. Many positive reviews on moon-net. If you have any interest in local repeaters or EME on 1296, along with activating AO92 via L band, for $198 PNP, this is hard to beat. http://www.sg-lab.com/TR1300/tr1300.html

73s, Craig

N6RSX

-----Original Message----- From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Brad Brooks Sent: Tuesday, January 30, 2018 12:41 PM To: amsat-bb@amsat.org Subject: Re: [amsat-bb] Potential 23cm FM transmitter

Good day to all. Related to my previous post, please check this link for an interesting NBFM transceiver board for L-band uplinks:

http://www.pe1jpd.nl/index.php/23cm_nbfm/

Now I just need to find time!

73 Brad WF7T EM66

On Jan 26, 2018, 1:43 PM -0600, Brad Brooks brad.wf7t@gmail.com, 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.

Www.dkars.nl

73 Brad WF7T Nashville TN EM66

_______________________________________________ Sent via AMSAT-BB@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

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Looks like an interesting project, although the price of the kit is a bit more than I'd like to pay for what I'd be using it for: talking to AO-92 on L-band.

I've been looking into something like a varactor-tuned frequency tripler, as shown a bit over half-way down this web page: http://www.sydneystormcity.com/microwave.htm The schematic is here: http://www.sydneystormcity.com/1296%20Tripler.gif It may not be an ideal solution but considering how often the L-band experiment will be active on AO-92, I'm looking at a cost-effective solution.

73,

Mac Cody / AE5PH

On 01/30/2018 02:40 PM, Brad Brooks wrote:

Good day to all. Related to my previous post, please check this link for an interesting NBFM transceiver board for L-band uplinks:

http://www.pe1jpd.nl/index.php/23cm_nbfm/

Now I just need to find time!

73 Brad WF7T EM66

On Jan 26, 2018, 1:43 PM -0600, Brad Brooks brad.wf7t@gmail.com, 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.

Www.dkars.nl

73 Brad WF7T Nashville TN EM66

---

Sent via AMSAT-BB@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

I read somewhere the PE1JPD transverter kit has 25kHz steps only.

73's

Jerry

----- Oorspronkelijk bericht ----- Van: "Brad Brooks" brad.wf7t@gmail.com Aan: "amsat-bb" amsat-bb@amsat.org Verzonden: Dinsdag 30 januari 2018 21:40:53 Onderwerp: Re: [amsat-bb] Potential 23cm FM transmitter

Good day to all. Related to my previous post, please check this link for an interesting NBFM transceiver board for L-band uplinks:

http://www.pe1jpd.nl/index.php/23cm_nbfm/

Now I just need to find time!

73 Brad WF7T EM66

On Jan 26, 2018, 1:43 PM -0600, Brad Brooks brad.wf7t@gmail.com, 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.

Www.dkars.nl

73 Brad WF7T Nashville TN EM66

_______________________________________________ Sent via AMSAT-BB@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

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@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.

73,

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.

Www.dkars.nl

73 Brad WF7T Nashville TN EM66 _______________________________________________ Sent viaAMSAT-BB@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@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

Below is the translation of the article, if anyone's interested.

73,

Mac / AE5PH

A 23cm narrowband FM homebody transceiver By Michel Lips, PA7ML

I have been active on the U-SHF frequencies for several years as an ATV driver. For a long time I also wanted to work in phone on those high frequencies. Now you can buy a well-known brand transceiver and place a module in it to be radioactive at 23cm. No matter how beautiful these shopping boxes are, that is not the challenge of the radio hobby for me. With some research on Google I discovered the website of Bas, PE1JPD. There I found a kit for a 23 cm NBFM transceiver working from 1240 to 1300 MHz. The transceiver offers, among other things, simplex and duplex settings.

I am a less experienced electronics manufacturer. I also did not follow any training in this field. However, in recent years I have built some small radio hobby projects, but no self-built FM transceiver. I finally purchased the kit. All parts have been collected and checked by me. The construction instructions are well described. Experiences are exchanged on various forums and websites.

First, I soldered all SMD components on the underside of the PCB. A thin soldering iron and a loupe with lighting should not be missing. Then I placed the top according to instructions according to instructions.

For the parts that were unknown to me, I went to look up the specs on the internet to understand the operation and the connections. With my print layout I had to remove some parts and then place a purchased TCXO.

Then drilled holes in the HF can and soldered the print to the can. Then the wiring is applied to the transit C's to the LCD, shift switch, rotary encoder, volume on / off button, microphone and voltage connection. I had not yet made the wiring final; I finally did that when installing a transceiver housing.

Then put tension on it. There were no bangs or smoke plumes, but the frequency of PI6NOS on the LCD. The sending also worked. But just went to good friend Willem, PE1EZU, to do some measurements. The power meter hole 400 mW and a deviation of 2 hertz. With a 23 cm ATV transmitter with a dBm attenuator set the Murata band filter and the Toko coils for the 63 MHz mid-frequency. This went less well. When visiting the Leo Bak room of PI4RCG with Bas, PE1JPD, the designer quickly noticed the inconvenience. The Toko coils and discriminator were incorrectly soldered. The Toko coils are connected with a bypass to ground and the discriminator is removed and replaced by a regular yellow mid-frequency coil with a 156 hp [pF] C.

One of the Toko coils had a crazy ferrite core. By placing a hair out of a paintbrush on the side, the ferrite core could be tuned back to normal. Furthermore, I have applied the modifications of Remco, PE1FYM, and what I found to updates on the website of PE1JPD. A Peiker microphone completes the construction package.

Then the first connection was a fact at the location of PI4RCG to PI6NOS.

Via eBay, I found a provider of cheap and beautiful housing in Bangkok. You buy there for about 20 euros excluding 20 euros shipping this metal box. I applied the HF-tin and the power supply to an experimental circuit board and built it into the metal box. To complete the project, I want to build a power module and pre-amp with, among other things, SMA relays in the same kind of metal box.

There are radio colleagues who find these kinds of projects difficult. On the one hand inexperience with electronics building projects or having little or no SMD solder experience. I want to encourage radio amateurs to participate in a DIY project. It is namely educational and fun to do. In addition, it does not have to be finished tomorrow, if you time and sentence you get the job done in your radio hack. If you do not have any measuring equipment, then surely a radio friend / radio club has.

Lima-SDR is a comparable building package, but then for HF. You will also find a lot of information about this on the web. See also the links below.

http://www.pe1jpd.nl/

http://www.zendamateur.com/viewtopic.php?f=14&t=15109

http://chevalgrp.com/standalone.php

http://www.lima-sdr.nl/tiki-index.php

http://limasdr.blogspot.nl/?m=1

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@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.

73,

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.

Www.dkars.nl

73 Brad WF7T Nashville TN EM66 _______________________________________________ Sent viaAMSAT-BB@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@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@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

I had a brief email exchange with Bas PE1JPD. He confirms the step size is indeed 25KHz but is investigating how to produce a 5KHz step.

He has been quick to respond, and I would encourage anyone who has questions to review his site and ask questions via email to him.

http://www.pe1jpd.nl

73 Brad WF7T EM66

On Feb 1, 2018, 2:09 PM -0600, Zach Metzinger zmetzing@pobox.com, wrote:

On 01/31/18 20:10, Mac A. Cody wrote:

...

A 23cm narrowband FM homebody transceiver By Michel Lips, PA7ML

I have been active on the U-SHF frequencies for several years as an ATV driver. For a long time I also wanted to work in phone on those high frequencies. Now you can buy a well-known brand transceiver and place a module in it to be radioactive at 23cm. No matter how beautiful these shopping boxes are, that is not the challenge of the radio hobby for me. With some research on Google I discovered the website of Bas, PE1JPD. There I found a kit for a 23 cm NBFM transceiver working from 1240 to 1300 MHz. The transceiver offers, among other things, simplex and duplex settings.

The problem with this design is that it uses the MC3372, which is obsolete. findchips.com shows that Quest and Bristol have a few, but not many.

One could replace this chip with additional mixers and perhaps a SA612-based FM discriminator.

--- Zach N0ZGO _______________________________________________ Sent via AMSAT-BB@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