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Re: Réf. : Re: Re: 5.7 GHz PAs
geoffrey pike
Just to confirm some numbers, with the SMAs changed and at 5.750 GHz 21.4 dBm in gives 36 dBm out or 140 mW in for 4 watts out and only slightly compressed. So perhaps an out board wilkinson combiner/splitter for some more power using two of these. Geoff GI0GDP the cover was not fitted at this time.
On Friday, 26 August 2016, 20:08, "Andy Talbot andy.g4jnt@... [ukmicrowaves]" wrote: After a few minutes at over 4 Watts 100% dutu cycle mine dropped power suddenly by about 3dB, but after turning off then allowing to cool, full power was restored. The LED / PSU was fine. So it down look as if the advised levels of 3 Watts continuous and 4.5Watts max should be adhered to. Did you try it after cooling down ? The SMPSU chip may have an over-temperature cutout. 'jnt On 26 August 2016 at 19:52, g4cch_1@... [ukmicrowaves] <ukmicrowaves@...> wrote:
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24GHz gear at Crawley
STEPHEN COOKE
Due to a change in circumstances , there will be one possibly two 24GHz
transverters for sale at Crawley . Both are 432 MHz I.F. , based on the Alcatel " white box " modules and fully working ..... 500mW output if I remember correctly ... I will check the paperwork . Looks like there will be lots of goodies for sale on Sunday ! Steve G1MPW
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Re: Crawley Round table. G4BAO kits update.
g4bao
No. It's all on www.g4bao.com
On 13 Sep 2016 20:02, "'Paul Bicknell' paul@... [ukmicrowaves]" <ukmicrowaves@...> wrote:
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Microwave equipment for sale
Got the following equipment for sale ...going to Crawley Sunday
Downeast microwave 2w in 8w+ out 10ghz amp 3.4ghz PLL lnb ..new ..ideal for 3.4ghz ATV repeaters DB6NT 10ghz 200mw ATV TX plus DG0VE baseband modulator 10ghz LNBs modified for 9ghz LO 23/24cms G1MFG TX board , display board and 1w amp..built into box..needs finishing. 10ghz dish with waveguide / dipole feed. 2x lengths flexi waveguide wg16 Any interest please e mail direct ..and I will provide further details Essexsteve@icloud.com Steve G4HTZ
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Re: 3cm good this morning
Mark Turner <ei3kd@...>
WebSDR is rx JO21, JO22 and JO34 beacons this (14th Sep) morning on 3cms, very strong! Regards, Mark EI3KD
On 13/09/2016 09:46,
martin_ehrenfried@... [ukmicrowaves] wrote:
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Re: Test Equipment for Sale
Dave G8KHU
Sorry there is a typo on the list, the HP473B power meter should read HP437B
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Re: calling / working frequency
Wolfgang Hoeth OE4WOG
------ Originalnachricht ------
Von: "'Paul Bicknell' paul@... [ukmicrowaves]" <ukmicrowaves@...>
An: ukmicrowaves@...
Gesendet: 13.09.2016 20:53:00
Betreff: RE: [ukmicrowaves] calling / working frequency
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Re: LM2596S-ADJ Ebay modules
I wasn't concerned with RF suppression from the module - that was dealt with elsewhere in the beacon source. Its not noise from the 19V PSU source you need to concern yourself with, its making sure there is a low enough dynamic source impedance to cope with the LM2596 on period. Output C then defines the output ripple. The input C is by far the more important in boost converters - those that step a voltage up - as it has to supply the energy to be stored in the L during the on cycle. Buck converters like these - ie. step down, are rather more benign as teh current through the output L is essentially continuous so current spikes aren't so big. Lots of small low EST caps are better than one big one. 'jnt
On 13 September 2016 at 20:12, 'g8zha' g8zha@... [ukmicrowaves] <ukmicrowaves@...> wrote:
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Re: Crawley Round table. G4BAO kits update.
Paul G8KFW
Thank you Steve thought it might create a bit of interest Paul B
From:
ukmicrowaves@...
[mailto:ukmicrowaves@...]
In case John doesn't reply for a while details are on his website with downloads
Steve G4HTZ
No virus found in this message.
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Re: LM2596S-ADJ Ebay modules
g8zha <g8zha@...>
Just had a look at the ON Semiconductors data sheet. It recommends 100u on the input and 220-470u on the output. Did you add any small 10n caps to stop any HF on the output?
I am using one to power a Rubiduim 10MHz reference at 15V from a computer 19V PSU. I have included lots of L and C on the input as I reckoned the computer PSU would be quite noisy.
I will change the input and output caps for some Lo ESR types at work tomorrow, and add some L on the output of the module.
Thanks for your comments. Rich
From: ukmicrowaves@...
[mailto:ukmicrowaves@...]
Sent: 13 September 2016 17:46 To: ukmicrowaves@... Subject: Re: [ukmicrowaves] LM2596S-ADJ Ebay modules
I stuck more C on the output and more C on the input. They don't have enough input or output C even according to the data sheet recommendations. Some input and output L and further RF decoupling might help if you get radiated interference issues, but that wasn't a problem here.
'jnt
On 13 September 2016 at 17:42, 'g8zha' g8zha@... [ukmicrowaves] <ukmicrowaves@...> wrote:
I saw that Andy G4JNT used one of these modules in a recent project but said they needed a few mods to improve the performance. Looking on the ’net suggests an additional coil and capacitor low pass filter on the output.
I wonder what you did Andy?
Regards, Rich
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Re: Crawley Round table. G4BAO kits update.
In case John doesn't reply for a while details are on his website with downloads Steve G4HTZ
On 13 Sep 2016, at 20:02, 'Paul Bicknell' paul@... [ukmicrowaves] <ukmicrowaves@...> wrote:
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Re: Crawley Round table. G4BAO kits update.
Paul G8KFW
Hi John Could you please post the specification for the 2.5 watt pa kit on this site also the cost ?
From:
ukmicrowaves@...
[mailto:ukmicrowaves@...]
Hi Folks First email (and subsequent payment!) gets the kit, or if not I'll bring it to Crawley on Sunday. I still have plenty of the 2.5 watts driver kits so If you want to
collect one from Crawley on Sunday please
email me and I'll bring enough for all. John
No virus found in this message.
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Re: calling / working frequency
Paul G8KFW
Hi Wolfgang
Interesting the reason I asked the question is I have two 76 Ghz transceivers that I need to re Xtal I am also looking for a local oscillator chine to use at 135Ghz
So from your note 76,032,1 is not preferred and I have been told the UK have moved from 76,032,1 to 75.967,1 have I got this correct
Regards Paul B
From:
ukmicrowaves@...
[mailto:ukmicrowaves@...]
24.048,1 48.088,1 76,032,1 note 1 134.928,1 note 2
note 1: not preferred ( because of second allocation to amateur radio ) but still used widely in Central Europe note 2: according to IARU Region 1 frequency allocation, used only in Central Europe
BTW: asking for changes in frequency plans and allocations may not accepted at the time being, but more detail explanations will help to understand the issue(s)
73 de Wolfgang, OE4WOG microwave manager OEVSV
------ Originalnachricht ------ Von: "paul@... [ukmicrowaves]" <ukmicrowaves@...> An: ukmicrowaves@... Gesendet: 09.09.2016 11:56:33 Betreff: [ukmicrowaves] calling / working frequency
No virus found in this message.
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Anyone QRV cm RS now via IN99 ?
F6DZK Michel
Anyone QRV cm RS now via IN99 ? 73 Michel F6DZK
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Re: LM2596S-ADJ Ebay modules
I stuck more C on the output and more C on the input. They don't have enough input or output C even according to the data sheet recommendations. Some input and output L and further RF decoupling might help if you get radiated interference issues, but that wasn't a problem here. 'jnt
On 13 September 2016 at 17:42, 'g8zha' g8zha@... [ukmicrowaves] <ukmicrowaves@...> wrote:
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LM2596S-ADJ Ebay modules
g8zha <g8zha@...>
I saw that Andy G4JNT used one of these modules in a recent project but said they needed a few mods to improve the performance. Looking on the ’net suggests an additional coil and capacitor low pass filter on the output.
I wonder what you did Andy?
Regards, Rich
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hupRF at RSGB Hamfest
dave powis <g4hup@...>
Further to my previous e-mail, there has been a change of plan due to an accident (not mine!)
I will now be trading as planned from the flea market on Friday 30th Sept. I will also be present at the Hamfest on Saturday 1 Oct, but will be primarily on the RSGB TEC/Exams stand. So if you are coming along to the Hamfest on Saturday, please come and find me there, and we can sort out whatever you need - I will still have the remaining stock that has not sold on Friday available....see http://hupRF.com Best 73, Dave
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DB6NT Sale
geoffrey pike
Judging by the prices of the microwave transverters in the DB6NT offers pages one is left to imagine they are all going to get a 21st century make over like the 13cm one reviewed in Radcom last. The prices even at 1.18 euro to the pound are attractive. regards Geoff GI0GDP
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Re: Test Equipment for Sale
Dave G8KHU
Thanks Steve, as suggested here is the list. If anyone's interested email me direct at david@fielding-electronics dot co dot uk Tektronix TDS2024 Colour LCD Digital Oscilloscope
HP339A Distortion Measurment Set
HP8657A Signal Generator
100kHz - 1050 MHz HP8643A 10kHz - 1280MHz Signal Generator ******* Very high spec generator but has FAULT ****** Randomly resets itself, sometimes will go for days OK and other times resets every couple of minutes. Fireberd 6000 BER Test Set
Dave G8KHU
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Re: Test Equipment for Sale
I've posted equipment for sale on here as have others ...so post away. Maybe list what you have without prices ?? And people can contact you direct if interested .... Well that's my thoughts Steve G4HTZ
On 13 Sep 2016, at 11:59, david@... [ukmicrowaves] <ukmicrowaves@...> wrote:
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