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Re: LZ 13cm transverter
Paul G8KFW
Hi I might be dum but the title is 13 cm transverter please elaborate as you talk about a 23 Cm, model From:
ukmicrowaves@... [mailto:ukmicrowaves@...]
Not sure
how many people have tried the new 13cm transverter that complments thier 23cm
model, but I have one on order and hope to check it out next weekend.
No virus found in this message.
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Re: RAL
Paul G8KFW
Hi mike Sorry I don’t understand your comet below was this related to another posting ? if so please include the origin posting / question / subject
From:
ukmicrowaves@... [mailto:ukmicrowaves@...] Not
this year because there were no available dates in June. This was because
all the weekends we could make were either major contests or local rallies. Posted by: willis.mj@...
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GMRT 2016 date announced
The GM Microwave Round Table will be on Saturday 12 November 2016. (Note the change from first to second Saturday this year.)
Details will be posted on the website as usual: GMRT - home
73 John GM8OTI
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Re: Modamps
John Fell
Have several of the WDG Avantek devices if needed Neil.Trade for real Yorkshire puddings! John G0API
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Re: Modamps
Neil Smith G4DBN
re: stereo microscopes and teensy devices:
I do like the look of those devices, thanks for the heads-up Andy. Not sure what their longevity of supply is though. Mouser show them as obsolete/discontinued, and even the VMMK-3803-BLKG is marked as obsolete, but RS and Mouser have stock of those at about a fiver each. 2dB NF, 18dB gain at 10GHz, same package. I can’t see anyone doing an alternative, so maybe time to find a cheap source and stock up on them like I did for the old Modamp devices in 1983 or so. I am down to my last two Avanteks... I use a scope like this: https://www.amazon.co.uk/7X-45X-Binocular-Stereo-Microscope-Double/dp/B006QXBP6I and it has been superb for working on even the teensy DFN packages with 0.5mm spacing. The working distance is about 100mm, which is a bit too close if you are working on boards which are seam-soldered inside a box. The very long reach arm is a joy to use, leaves plenty of free bench space. I had to drill some small holes in the conical lens shroud to fit my ultra-cheap LED ringlight, but luckily it is radio-silent. I have a 0.5mm needle tip on a temp-controlled iron that works for most devices, but I have done a few boards using a 100x100x12mm aluminium slab on top of a single mains cooking hotplate. I use a fine hypodermic to apply medium-temp solder paste to the pads, then pick-and-place the devices under the microscope with tweezers. I have drilled a hole into the ally block and fitted a thermocouple so I can ramp up the heat to just under soldering temp, then use a hot-air reflow blower to do the final melt. I then move the block on to a cooling plate to ramp the temperature down. Haven’t killed any devices yet. If/when I mess up, I use one of those 15 quid soldering tweezer things to remove the offending device. Main use of the hotplate is for soldering LDMOS devices to copper heat spreaders, but for those I use 138C melting point solder paste rather than the higher-temp stuff. Neil G4DBN
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Re: Modamps [1 Attachment]
They turn up at rallies quite often. I picked up a nice one last year for just £40, two fixed magnifications. I'd had another stereo microscope that I got for £60 about a decade ago, that had a nice zoom. It came with had no support so I had to make a stand which actually made it a useful bit of kit, as I could then customise it onto an SMD soldering platform with metal tray / clamp arrangement. 'jnt
On 12 June 2016 at 15:11, GORDONJ REASON gordonj.reason@... [ukmicrowaves] <ukmicrowaves@...> wrote:
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Re: Modamps
GORDONJ REASON <gordonj.reason@...>
Get one of these ...... Excellent value ........... make's a tough job easier .......... and get the 0.5 reducer ........... about £20 .... The ring light psu , is the best rf wideband source ever ............... so , swopped the dc socket wiring to a positive centre pole , and use a "normal" quiet dc supply ............... Incidently , for these very small packages , is there perhaps , a small infra red "iron" type device for soldering them in place ....
On 12 June 2016 at 14:43 "Andy Talbot andy.g4jnt@... [ukmicrowaves]" <ukmicrowaves@...> wrote:
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Re: LZ 13cm transverter
Keith D. Le Boutillier <keithl@...>
Hi Mike
Interested in your email do you have any further info or a web link
73 Keith GU6EFB
From: ukmicrowaves@... [mailto:ukmicrowaves@...]
Sent: 12 June 2016 14:50 To: ukmicrowaves@... Subject: [ukmicrowaves] LZ 13cm transverter
Not sure how many people have tried the new 13cm transverter that complments thier 23cm model, but I have one on order and hope to check it out next weekend.
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LZ 13cm transverter
Mike Willis
Not sure how many people have tried the new 13cm transverter that complments thier 23cm model, but I have one on order and hope to check it out next weekend.
Very good price and lockable to 10MHz. Also capable of LO reprogramming which might be important for us. Mike
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Re: Modamps
Where's your spirit of adventure ! A 1mm long package with three pads is no big deal ;-) And nearly twice the gain. 'jnt
On 12 June 2016 at 14:10, geoffrey pike gi0gdp@... [ukmicrowaves] <ukmicrowaves@...> wrote:
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Re: RAL
Mike Willis
Not this year because there were no available dates in June. This was because all the weekends we could make were either major contests or local rallies.
The other weekends either I was away, or Mike and Ann were. What we need is a retired person with time to organise. Now we are not tied to RAL we have more scope in that direction. Since the rest of you retired, those of us remaining have more to do, Mike
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Re: Modamps
geoffrey pike
This is certainly much easier to work with! Geoff GI0GDP On Sunday, 12 June 2016, 13:45, "Neil Whiting neil@... [ukmicrowaves]" Looks like a useful device, though the
1x0.5mm package might be interesting to handle :-) Seems to be a 3-lead 0402, so not quite as challenging as some of the other tiny packages - I'd be prepared to give it a go anyway. Thanks/73 Neil G4BRK
On 12/06/2016 10:54, Andy Talbot andy.g4jnt@...
[ukmicrowaves] wrote:
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Re: Modamps
Neil Whiting <neil@...>
Looks like a useful device, though the
1x0.5mm package might be interesting to handle :-) Seems to be a 3-lead 0402, so not quite as challenging as some of the other tiny packages - I'd be prepared to give it a go anyway. Thanks/73 Neil G4BRK
On 12/06/2016 10:54, Andy Talbot andy.g4jnt@...
[ukmicrowaves] wrote:
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Re: Modamps
Found this one at Farnell http://www.farnell.com/datasheets/77793.pdf Fixed 5V bias, over 13dB at 10GHz and a not outrageous noise figure by the look of it. More expensive than the ERAs used to be though, but at that gain probably replaces two cascaded.. 'jnt
On 12 June 2016 at 10:34, Andy Talbot <andy.g4jnt@...> wrote:
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Re: Modamps
geoffrey pike
Hi Andy and group, I used ERA-1 in a cascaded amp for 3cm and from my notes got 16dB gain but with limited output. I then used the RFMD NLB-310 device that Farnell use to do. P1dB +13 dBm and 9.6 dB gain. I got mine from Australia i think RF-Kits?, not sure if they are still available and RFMD has merged i believe. The ERA-1 devices are very cost effective and some rudimentary tabs on the lines helped somewhat. I think there is a picture of the ERA-1 amp in the files section and some other stuff. regards Geoff GI0GDP
On Sunday, 12 June 2016, 10:34, "Andy Talbot andy.g4jnt@... [ukmicrowaves]" wrote: Over the years I've watched Silicon modamps (the MAR series) morph into the GaAs ERA types, and seen a host of lower frequency very high gain and low noise figure types like the PGA and MGA ones appear. All influenced, no doubt, by the mobile market with its low GHz operations
But has much happened at the high frequency end, 8 to 12GHz? What more modern devices are suited up there? This came about as I wanted a modest gain amp of about 7dB at 10GHz to boost the output of the mixer described in the latest Scatterpoint up to around -4dBm to drive a 1 Watt PA. I had a couple of ERA-1 devices which, although only specified to 8GHz, have been reported as going to 10Ghz and even higher. I used a bit of hacked-off old Amstrad board (remember those ?) placing the ERA where one of the old GaAs FETs would have gone, stripping off tuning stubs and adding a couple of 3.3pF ATC capacitors. Ending up with the arrangement here : http://www.g4jnt.com/DropF/era1_amp.JPG Result, 8dB of small signal gain at 10GHz, which is rather more than extrapolating the data sheet curve suggests. So plenty of margin in hand for my purpose. But, what modamp type devices are recommended up here? Surely the ERAs are a bit long-in-the-tooth now ? Andy G4JNT
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Modamps
Over the years I've watched Silicon modamps (the MAR series) morph into the GaAs ERA types, and seen a host of lower frequency very high gain and low noise figure types like the PGA and MGA ones appear. All influenced, no doubt, by the mobile market with its low GHz operations But has much happened at the high frequency end, 8 to 12GHz? What more modern devices are suited up there? This came about as I wanted a modest gain amp of about 7dB at 10GHz to boost the output of the mixer described in the latest Scatterpoint up to around -4dBm to drive a 1 Watt PA. I had a couple of ERA-1 devices which, although only specified to 8GHz, have been reported as going to 10Ghz and even higher. I used a bit of hacked-off old Amstrad board (remember those ?) placing the ERA where one of the old GaAs FETs would have gone, stripping off tuning stubs and adding a couple of 3.3pF ATC capacitors. Ending up with the arrangement here : http://www.g4jnt.com/DropF/era1_amp.JPG Result, 8dB of small signal gain at 10GHz, which is rather more than extrapolating the data sheet curve suggests. So plenty of margin in hand for my purpose. But, what modamp type devices are recommended up here? Surely the ERAs are a bit long-in-the-tooth now ? Andy G4JNT
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Re: UK Microwave Group mm-wave contest - Sunday 19th June
g4bao
G4BAO
On 11 Jun 2016 20:35, "G3XDY g3xdy@... [ukmicrowaves]" <ukmicrowaves@...> wrote:
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UK Microwave Group mm-wave contest - Sunday 19th June
John Quarmby
The first of this year's UKuG mm-wave contests takes place next Sunday 19th June, from 0900-1700GMT (1000-1800BST), on the 24, 47 and 76GHz bands.
I believe several will have already made plans for the paths they wish to try, I can create and circulate an activity list in the usual format for anyone wishing to take part. Please let me know your operating plans. 73 John G3XDY UKuG Contest Manager
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RAL
Is RAL just "not this year" or "not any more years" 'jnt
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1N53 coaxial diode detectors
Paul G8KFW
Hi all I am looking for the small coaxial diode detectors used at 33 ghz and above Part number 1N53 as I have several wave guide mounts missing the diode
Also looking for H bend in WR 8 / WG 28 or WR 10 / WG 27
Regards Paul B
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