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Re: Nearly Off-topic
g4uvz@...
Chris GW4DGU is your man! He was the designer / manufacturer ,,he is on this forum Adrian G4UVZ
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Nearly Off-topic
oz4vw@...
Hello Need a bit old Old Ham knowledge One of my friend have found a Mutek LNA 432 Internet is blank Br Arne OZ4VW
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Re: Activity List for UK Microwave Group Low Band Contest Sunday 8th May
Phil Guttridge G3TCU
We'll be out for the May session:
On 02/05/2016 21:54, G3XDY
g3xdy@... [ukmicrowaves] wrote:
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Re: Fans
Michael Scott
Hi Nick and John
Many thanks for the info. I was going to use the cpu fan to cool the copper
slab on which a 1 watt 10GHz amplifier is mounted. The tip about the ferrite
beads is useful and easy to do as the wires are very thin.
73, Mike
From: mailto:ukmicrowaves@...
Sent: Wednesday, May 4, 2016 11:34 AM
To: ukmicrowaves@...
Subject: Re: [ukmicrowaves] Fans
Hi Mike,
The white wire is used to count pulses from the fan and used to control
it’s speed. Be careful with computer ect DC fans as they use electronic
circuitry to control the speed and are vulnerable to high RF fields. I have
blown several up due to this. You need to apply ferrite beads as close to where
the wires terminate on the fan as possible, and decoupling capacitors are a good
idea as well. I generally run them constantly on TX and employ a 50C thermal
switch on the heatsink which runs them continually if the heatsink temperature
demands it.
Regards,
Nick G4KUX
From: mailto:ukmicrowaves@...
Sent: Wednesday, May 04, 2016 11:16 AM
To: ukmicrowaves@...
Subject: [ukmicrowaves] Fans
Hi All
Sorry this is a bit OT.
I have a couple of small fans I want to use to cool a heat sink. One is on
a small heat sink and looks as if it was intended to cool a CPU, the other is
off a defunct DVD recorder. Both have three wires, red, black and white. DC
applied to the red and black cause the fan to rotate. The question is, what is
the purpose of the white wire?
Thanks in anticipation!
73, Mike,
G3LYP
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Re: Fans
Nick Peckett G4KUX
Hi Mike,
The white wire is used to count pulses from the fan and used to control
it’s speed. Be careful with computer ect DC fans as they use electronic
circuitry to control the speed and are vulnerable to high RF fields. I have
blown several up due to this. You need to apply ferrite beads as close to where
the wires terminate on the fan as possible, and decoupling capacitors are a good
idea as well. I generally run them constantly on TX and employ a 50C thermal
switch on the heatsink which runs them continually if the heatsink temperature
demands it.
Regards,
Nick G4KUX
From: mailto:ukmicrowaves@...
Sent: Wednesday, May 04, 2016 11:16 AM
To: ukmicrowaves@...
Subject: [ukmicrowaves] Fans
Hi All
Sorry this is a bit OT.
I have a couple of small fans I want to use to cool a heat sink. One is on
a small heat sink and looks as if it was intended to cool a CPU, the other is
off a defunct DVD recorder. Both have three wires, red, black and white. DC
applied to the red and black cause the fan to rotate. The question is, what is
the purpose of the white wire?
Thanks in anticipation!
73, Mike, G3LYP
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Re: Fans
John Quarmby
Hi Mike This link gives a bit of info on the various fan wiring arrangements. I think its safe to say you can ignore the white wire, just leave it isolated. http://pcbheaven.com/wikipages/How_PC_Fans_Work/ 73 John G3XDY On 04/05/2016 10:16, 'Michael Scott'
g3lyp@... [ukmicrowaves] wrote:
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Fans
Michael Scott
Hi All
Sorry this is a bit OT.
I have a couple of small fans I want to use to cool a heat sink. One is on
a small heat sink and looks as if it was intended to cool a CPU, the other is
off a defunct DVD recorder. Both have three wires, red, black and white. DC
applied to the red and black cause the fan to rotate. The question is, what is
the purpose of the white wire?
Thanks in anticipation!
73, Mike, G3LYP
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Activity List for UK Microwave Group Low Band Contest Sunday 8th May
John Quarmby
I will assemble the usual activity list for the UKuG Low Band Contest this coming Sunday 8th May.
It takes place from 08:00 to 14:00 GMT (09:00 to 15:00 BST) on 1.3, 2.3 and 3.4GHz. This event is coordinated with the IARU/RSGB events over the weekend of 7/8th May, so there should be a reasonable activity level with some continental stations to work. If you are taking part in the other events as well then you don't need to start your serial numbers from 001 for the UKuG event. Please send your activity plans in the format below, to reach me by close of play on Friday. I will publish the list on Saturday morning. Callsign: G3XDY Locator: JO02OB Bands: 1.3GHz 400W 4x23ele 2.3GHz 100W 0.8m dish 3.4GHz 20W 0.8m dish Talkback: Direct CQ on 1.3GHz, ON4KST and 144MHz Times: Throughout. 73 John G3XDY UkuG Contest Manager
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Re: DEM 180 MHz xtal
John E. Beech
Thanks Ian,
I've e-mailed DEM. I've also had a closer look at their LO frequencies. I actually need a crystal for 179.666 MHz to cover 2300.000 to 2302.000 MHz with 144-146 MHz IF. I'm wondering if the existing xtal ( which I think is 180 MHz) will pull down to this frequency.
If it will it will make the job a whole lot easier!
de John G8SEQ
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Re: DEM 180 MHz xtal
ian hope (2E0IJH)
Not had Microwave stuff from DEM, but Had 144mhz kit and found them very helpful, I'd send them a email
http://www.downeastmicrowave.com/articles.asp?id=259
Ian
2E0IJH
Sent: Monday, May 02, 2016 at 10:19 AM
From: "john@... [ukmicrowaves]" To: "ukmicrowaves@..." Subject: [ukmicrowaves] DEM 180 MHz xtal
Hi All,
Would anyone here have a 180 MHz xtal suitable for a Down East Microwave transverter? Why, the person who bought the kit forgot to specify the xtal frequency and it came witht he one for the higherpart of the band. ( I did a qick search of DEM & got zilch.) Anyone know the spec so I can order one from somewhere.
de John G8SEQ
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DEM 180 MHz xtal
John E. Beech
Hi All,
Would anyone here have a 180 MHz xtal suitable for a Down East Microwave transverter? Why, the person who bought the kit forgot to specify the xtal frequency and it came witht he one for the higherpart of the band. ( I did a qick search of DEM & got zilch.) Anyone know the spec so I can order one from somewhere.
de John G8SEQ
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Ancient microwave diodes
Graham G3TCT
Hi all
I've been donated some diodes described as best I can in the attached. Not sure how to describe the packages correctly. Free to a good home. 73 Graham
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REV-16 relay
mike G6TRM
Hi,
I have a couple of REV-16 Russian relays, which I believe are good for use at 23cm. I am considering using one for my 23cm 150W amplifier, Does anyone have any experience of using them at this power level? thanks Mike G6TRM
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Re: 2300 Antenna still up and PI4 test signal ready to go
John Quarmby
Hi David
This was proposed in the UK Microwave Group Contest Forum at Martlesham, and I will adopt it for the UKuG events for 2017. I will also propose it counts as a separate band for the RSGB SHF UKAC too, but there a couple of caveats - the NoV for 2300MHz is only available to Full licence holders, so excludes Intermediates who can use 2320MHz, and its not available to GJ/GU/GD stations. There is a precedent for differential treatment of the licence classes in that Novices can't operate on the 2.3/3.4/5.7GHz bands. Watch this space, I will report back after the VHF Contests review is completed.
John G3XDY UKuG Contest Manager, RSGB VHFCC member. On 27/04/2016 11:27, David Warr
g4rqi@... [ukmicrowaves] wrote:
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76GHz SDR Available
Roger Ray
see the link below -
NI announces world’s first mmWave software defined radio to help speed 5G research
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Re: 2300 Antenna still up and PI4 test signal ready to go
g4bao
So, start lobbying your contest committee rep! John Don't wait for others to do it. The UKuG has a representative on the contest committee and has been instructed to bring up the topic on your behalf, but the more people that press for it the better. 73
On 27 April 2016 at 12:27, David Warr g4rqi@... [ukmicrowaves] <ukmicrowaves@...> wrote:
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Re: 2300 Antenna still up and PI4 test signal ready to go
David Warr <g4rqi@...>
Hello If you want to generate more interest in 2300Mhz then maybe one option would be to get it recognised as a separate band in the UKAC next year. 73 David
On 27 Apr 2016, at 09:33, "Andy Talbot andy.g4jnt@... [ukmicrowaves]" <ukmicrowaves@...> wrote:
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Re: 2300 Antenna still up and PI4 test signal ready to go
Rob, M0DTS
I did have a listen here for a couple of hours at the weekend with 3m dish but nothing heard. Was hearing ZME but that does not mean setup was good on 2300! Rob M0DTS IO94IL Sent from my Samsung device
-------- Original message -------- From: "Andy Talbot andy.g4jnt@... [ukmicrowaves]" <ukmicrowaves@...> Date: 27/04/2016 09:33 (GMT+00:00) To: ukmicrowaves@..., uk_beacons@... Subject: [ukmicrowaves] 2300 Antenna still up and PI4 test signal ready to go I still have my helix antenna up the mast and the PI4 beacon setup ready to switch on if anyone is interested. But there seemed no interest over the weekend other than Sam failing to get anything and Neil receiveing reliably on its sidelobes. No requests to point anywhere else. Sam, I think I know why the signal is poor with you. There is a thick tree in the way. Presumably, when you heard my 2.3GHz signal before it was during winter period when that tree was leafless. Was it winter - I never kept a record ? If t'was summer and the tree was in leaf, conditions must have been well up, coz its on boresight to you! Andy
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Re: SMPS
David <david.g6feo@...>
Both power supplies are now spoken for.
David. G6FEO. On Tue, 2016-04-26 at 16:38 +0100, David david.g6feo@... [ukmicrowaves] wrote: Hello Group,
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2300 Antenna still up and PI4 test signal ready to go
I still have my helix antenna up the mast and the PI4 beacon setup ready to switch on if anyone is interested. But there seemed no interest over the weekend other than Sam failing to get anything and Neil receiveing reliably on its sidelobes. No requests to point anywhere else. Sam, I think I know why the signal is poor with you. There is a thick tree in the way. Presumably, when you heard my 2.3GHz signal before it was during winter period when that tree was leafless. Was it winter - I never kept a record ? If t'was summer and the tree was in leaf, conditions must have been well up, coz its on boresight to you! Andy
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