Date   

Re: Stealth SM2527-44 amplifier.

Paul G8AQA
 

The 2527 means 2.5 - 2.7 GHz design frequency and the 44 means +44dBm output.  It seems that they will work outside their design frequency but maybe not very far.

Paul G8AQA

On 02/10/2017 22:37, g8cub@... [ukmicrowaves] wrote:
 

Jacques - I have 2 of these amplifiers combined. From memory they covered 2.40 - 2.75GHz, but will look tomorrow if a single amp works down to 2.30GHz

Roger
G8CUB



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Re: Stealth SM2527-44 amplifier.

Paul G8AQA
 

I have some test results here and they say that the SM2527-44 gives +44dBM at 2.3GHz.

Paul
G8AQA

On 02/10/2017 22:37, g8cub@... [ukmicrowaves] wrote:
 

Jacques - I have 2 of these amplifiers combined. From memory they covered 2.40 - 2.75GHz, but will look tomorrow if a single amp works down to 2.30GHz

Roger
G8CUB



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Re: Stealth SM2527-44 amplifier.

pa0jme@...
 

Hi Jacques, I think John PE1GHG has one or two. For his experiences try to contact him.
If you don't know how, pse contact me privately. I don't want to put John's email here.
73es Rien PA0JME


Re: Stealth SM2527-44 amplifier.

Roger Ray
 

Jacques - I have 2 of these amplifiers combined. From memory they covered 2.40 - 2.75GHz, but will look tomorrow if a single amp works down to 2.30GHz

Roger
G8CUB


Re: A couple of gripes about 1296MHz

Neil Smith G4DBN
 

Having a fixed time slot to get on the band might be a way to drum up some activity, Martin. Myself, I am working away a lot, and when I am home, I have a lot of other projects on the go. As a result, pumping up the mast and searching for a QSO on 23 is not top of my list of priorities. The Thursday evening MGM sessions used to be OK, but are now pretty much hopeless for me as I am rarely at home that night.

I would certainly be up for some regular skeds to do long-term propagation experiments on Monday/Friday/Saturday/Sundays, looking for off-axis scatter perhaps, or at least evaluating the most scattery planes and finding the optimal tx/rx over length and timing for contest exchanges. Keeping the sessions to 30 minutes max and doing a standard set of tests each time would eventually gather a useful body of data, without eating up too much time and energy.

During the day when I'm working from home, I can only do brief operational sessions in coffee breaks and over lunch, and pumping the mast up takes 7 minutes, then 3 minutes to drop it, so I only get 5 minutes operation during the break, hardly worth it. If I had the luxury of a permanently-available antenna, things would be a lot easier.

So, something like "2130z for 30 minutes every Monday and Friday night, using 10 second overs with some MGM aircraftscatter mode on 1296.xxx" might be the basis for a long-term sked which might attract others. Or SSB with 5 second overs during particular plane transits. Or skeds using passive scatter from the ISS, or 10 minute tropo tests or whatever. Someone needs to be the fulcrum of activity and hang in there for months and bug people to get on and operate, like Lyn GW8JLY did last year on 2m SSB. Plenty of DX spots and chatter on KST would also get people interested.

Neil G4DBN


On 02/10/2017 09:25, 'Martin Andrew' martin.andrew@... [ukmicrowaves] wrote:

After spending a minimal amount I have managed to get back on 1296MHz with what I
consider an averagesystem. Still some optimization to do, but I am asking myself
should I bother with the activity levels on the band.
This morning logged on to KST and see the usual stations there. 18 logged on at 07:45.
Now log on during a contest or activity period and there will be approximately 60 on. These
numbers are for all EU stations, for 'G' presently five logged on (two showing 'away'), during
contests I would expect to see around thirty 'G's' logged on.
WHERE ARE THEY outside activity periods. Or have they beaten me to it by deciding
there is no 23cm activity outside of contests. This is from observation over the last two
months. Yes, there has been almost no tropo recently but what happens to air scatter
outside contests ?. I presume it does not exist.
Many years ago there were some local(?) nets on 23cm. The nearest station to me was
in Edinburgh 270Km distant. Now no activity unless they have become 'private' nets.
I have two beacons that (from earlier experience) should be detectable here.
BOTH are showing as 'operational' on Beaconspot.eu. One is
definately not QRV (unless other info has not been updated) and the other may or may not
be fullyoperational according to information on Beaconspot. I know requests have been made
both on here and at the last microwave meeting at Martelsham to update information,so do I
beleive the information on there or ignore a good resource as probably not up to date. I will
not name the beacons on here but suffice to say both are located in Scotland on the East
side.
So today it is too windy to put the antennas up, but I will hear and work the same number of
stations that I hear when the antennas are up, NON and will probably stay that way until the
next contest. Which begs the question, is it worth staying on what I considered an interesting
band many years ago.
Martin, GM6VXB


Re: Stealth SM2527-44 amplifier.

Donald Hawbaker <donaldhawbaker@...>
 

I’ve never used that model but it looks like it is designed for a higher frequency range.

There are usually units available on eBay designed for 2.3 GHz with similar specs.



Sent from Yahoo Mail for iPad

On Monday, October 2, 2017, 3:50 PM, pa3evz@... [ukmicrowaves] wrote:

 

Hello everyone,

First I shall introduce myself, my name is Jacques and my callsign is PA3EVZ.
I live in the in waddinxveen JO22hb and I am QRV on 160m to 23 cm at this moment.

But I have a question about the Stealth amplifier.
Is there someone who has some  experience with this kind of amplifier?
Is it possible to get it working  on 13 cm?

Thanks for help.

73's,
Jacques PA3EVZ



Stealth SM2527-44 amplifier.

Jacques PA3EVZ
 

Hello everyone,

First I shall introduce myself, my name is Jacques and my callsign is PA3EVZ.
I live in the in waddinxveen JO22hb and I am QRV on 160m to 23 cm at this moment.

But I have a question about the Stealth amplifier.
Is there someone who has some  experience with this kind of amplifier?
Is it possible to get it working  on 13 cm?

Thanks for help.

73's,
Jacques PA3EVZ



Re: GB3CFG 23cms

Brian Howie <brian@...>
 

In message <007b01d33a97$242d7d30$6c887790$@carltonhouse.eclipse.co.uk>, "'John Lemay' john@carltonhouse.eclipse.co.uk [ukmicrowaves]" <ukmicrowaves@yahoogroups.com> writes
Is the beacon QRV ? Not seen or heard it for a few days.

John G4ZTR
When was down in Galloway a few weeks ago, it was drifting all over the band from time to time down to 955. It was also a bit wobbly even when on the correct frequency on Spectran. I posted something on Beaconspot about it. Can you hear the 4m beacon ?

Brian GM4DIJ
--
Brian Howie


Re: Power meter to measure sun noise etc.

Rob, M0DTS
 

If you need more bandwidth to measure across and like the software solution...
Using latest SDR# there is now a 'Signal Diagnostics' plug-in, this allows you to measure/reference the filtered passband level or the whole 1 or 2 MHz with rtlsdr (or 8MHz if using an Airspy Rx).
It gives very repeatable Sun/Cold sky noise measurements here and a little moon noise on 6cm.

Rob
M0DTS

On 10/2/2017 10:16 AM, John Fell john.g0api@... [ukmicrowaves] wrote:
 
THe G3YGF design , is shown in The Microwave Technical Collection , on Page 15.5.2 " A broadband Linear RF Power Meter ".
Both G3WDG and G4JNT have produced designs in the Microwave News Letter for 144MHZ based designs , using helical chamber filters .

I use the G4JNT analogue design in conjunction with an AVO 8 mirror scale meter for a  Moon surface noise tracking aid and when tweaking dishes OUTSIDE .
Using a laptop and Continuum is a pain in Sunlight .
In the shack I use the same plus Continuum on the SDR-IQ for detailed measurements .It can be used at reduced FFT rates for reduced latency but the analogue meter is the horse for that course .

73
John
G0API



Re: Power meter to measure sun noise etc.

John Fell
 

THe G3YGF design , is shown in The Microwave Technical Collection , on Page 15.5.2 " A broadband Linear RF Power Meter ".
Both G3WDG and G4JNT have produced designs in the Microwave News Letter for 144MHZ based designs , using helical chamber filters .

I use the G4JNT analogue design in conjunction with an AVO 8 mirror scale meter for a  Moon surface noise tracking aid and when tweaking dishes OUTSIDE .
Using a laptop and Continuum is a pain in Sunlight .
In the shack I use the same plus Continuum on the SDR-IQ for detailed measurements .It can be used at reduced FFT rates for reduced latency but the analogue meter is the horse for that course .

73
John
G0API


A couple of gripes about 1296MHz

GM6VXB
 

After spending a minimal amount I have managed to get back on 1296MHz with what I
consider an average system. Still some optimization to do, but I am asking myself
should I bother with the activity levels on the band.
This morning logged on to KST and see the usual stations there. 18 logged on at 07:45.
Now log on during a contest or activity period and there will be approximately 60 on. These
numbers are for all EU stations, for 'G' presently five logged on (two showing 'away'), during
contests I would expect to see around thirty 'G's' logged on.
WHERE ARE THEY outside activity periods. Or have they beaten me to it by deciding
there is no 23cm activity outside of contests. This is from observation over the last two
months. Yes, there has been almost no tropo recently but what happens to air scatter
outside contests ?. I presume it does not exist.
 
Many years ago there were some local(?) nets on 23cm. The nearest station to me was
in Edinburgh 270Km distant. Now no activity unless they have become 'private' nets.
 
I have two beacons that (from earlier experience) should be detectable here.
BOTH are showing as 'operational' on Beaconspot.eu. One is
definately not QRV (unless other info has not been updated) and the other may or may not
be fully operational according to information on Beaconspot. I know requests have been made
both on here and at the last microwave meeting at Martelsham to update information, so do I
beleive the information on there or ignore a good resource as probably not up to date. I will
not name the beacons on here but suffice to say both are located in Scotland on the East
side.
 
So today it is too windy to put the antennas up, but I will hear and work the same number of
stations that I hear when the antennas are up, NON and will probably stay that way until the
next contest. Which begs the question, is it worth staying on what I considered an interesting
band many years ago.
 
Martin, GM6VXB
 


Re: GB3CFG 23cms

Gordon GI6ATZ
 

I think Geoff is away so the likelihood is the Beacons is off

Gordon
GI6ATZ


Re: 24GHz LO multiplier

DF6NA Rainer
 

Hi Noel,

https://shop.kuhne-electronic.de/kuhne/en/shop/accessoires/pcbs/PCB+no++02++1224+GHz+Doupler/?card=670

73, Rainer


Am 01.10.2017 um 21:15 schrieb 'Noel Matthews' noel@... [ukmicrowaves]:

Looking for advice /ideas on what options there are to get from the Elcom synth at 11.8 up to 23.6 GHz for a 24GHz LO.

Any thoughts?

73 Noel G8GTZ



24GHz LO multiplier

Noel G8GTZ
 

Looking for advice /ideas on what options there are to get from the Elcom synth at 11.8 up to 23.6 GHz for a 24GHz LO.

Any thoughts?

73 Noel – G8GTZ


Re: Power meter to measure sun noise etc.

SAM JEWELL
 

Something often forgotten is that the wide bandwidth of the amplifiers required to get a good level of noise can also be a problem. At my home QTH I have beacons on all the microwave bands at nearby Martlesham. These play havoc with the wide band amplifier/detector systems. The Continuum mode system in Spectravue gives repeatable results at spans as small as a few tens of kHz. Not got a nearby beacon? What happens when there is a ‘bit of a lift on’?
I did have some success initially on 23cm by using 1294MHz as the cf. until a radar moved into that frequency range!
Just my observations......
73 de Sam, G4DDK





On Sunday, October 1, 2017, 2:42 pm, vk6xh@... [ukmicrowaves] wrote:

 

Whilst I do have a HP 5348A power meter I'm looking for something to use when portable to check sun/ moon noise at my 144 mhz IF on the 3 cms EME setup.

Not wishing to re invent the wheel and as always looking for the easy way out, any suggestions please ?

I have a few spare Arduino uno's if they could be used ? If not can someone point me in the right " economical " direction please :)

Many thanks 

Keith VK6EME / VK6KB




Re: Power meter to measure sun noise etc.

David Robinson
 

Mine is still in use!  The biggest obstacle to building it was getting the helical filters which were rare even then!

 

Dave

G4fre

 

 

From: ukmicrowaves@... [mailto:ukmicrowaves@...]
Sent: 01 October 2017 15:20
To: ukmicrowaves@...
Subject: Re: [ukmicrowaves] Power meter to measure sun noise etc.

 




Charlie, G3WDG did this some years ago.

 

He came off the 144 MHz IF with a few stages of MMIC's.  This brought the noise floor

up enough to deflect the Power Peter and directly read dB Noise Power.

 

Just how much MMIC gain you need depends on how much gain you have in your

3 cm Preamps, Xverter gain, and IF gain.  Also just how sensitive your Power Meter is.

 

But it is a valid way to measure Sun, Moon, and Earth/Sky noise.

 

73  WA5VJB/G8EMY

 


Re: Power meter to measure sun noise etc.

Christopher Bartram <cbartram@...>
 

Hello Keith

The technique I've used to measure Sun, Moon and Ground noise on 3cm and several other bands employs a dedicated measurement receiver I built initially back in the 1970s, and which has since been rehoused and updated several times. I recently checked the accuracy of the 30MHz attenuator using my work VNA and it was still of the order of 0.05 dB (ie. as good as I could reasonably expect to measure) over its range - after 30 years!

The receiver uses a simple variable gain 1MHz bandpass amplifier at 30MHz providing up to around 70dB gain and a zero-bias schottky diode detector. I don't try to make measurements open-loop, but rather use a calibrated attenuator ahead of the receiver to measure the noise/noise ratio, just reading-off the parts of a dB on a meter.

Zero-bias (and conventional) schottkys have a very accurate square-law ie. Pin to dB response at low levels. I seem to remember a design for a wide range square-law detector using a conventional schottky by Julian, G3YGF, in an old Radcom, which someone may be able to find for you. Successive detection chips like the '8310 suffer from cyclic inaccuracies as the individual detector come into play, and while they are a good way of measuring wide variations in signal level, they are likely to be misleading when looking at, say, Moon noise on 10GHz. I wouldn't try to use an SDR for this application, as the so-called continuum mode they use seems to have quite big latency, making it difficult to track the Moon manually.

Hope to work you on 3 in the not too distant future.

73

Chris GW4DGU



--


Info about a Thomson UD 5220-AA module

John Lambo
 

Maybe to big ??



73  John  PA7JB


Re: Power meter to measure sun noise etc.

Andy G4JNT
 

Or you could use an AD8310 log-power detector and meter.

If you don't want to build from scratch, there are Chinese design modules using that device and similar.

Some no doubt work properly and aren't made from counterfeit chips.

'jnt


Virus-free. www.avg.com

On 1 October 2017 at 15:19, KENT BRITAIN WA5VJB@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 

Charlie, G3WDG did this some years ago.

He came off the 144 MHz IF with a few stages of MMIC's.  This brought the noise floor
up enough to deflect the Power Peter and directly read dB Noise Power.

Just how much MMIC gain you need depends on how much gain you have in your
3 cm Preamps, Xverter gain, and IF gain.  Also just how sensitive your Power Meter is.

But it is a valid way to measure Sun, Moon, and Earth/Sky noise.

73  WA5VJB/G8EMY



From: "vk6xh@... [ukmicrowaves]" <ukmicrowaves@...>
To: ukmicrowaves@...
Sent: Sunday, October 1, 2017 7:42 AM
Subject: [ukmicrowaves] Power meter to measure sun noise etc.

 
Whilst I do have a HP 5348A power meter I'm looking for something to use when portable to check sun/ moon noise at my 144 mhz IF on the 3 cms EME setup.
Not wishing to re invent the wheel and as always looking for the easy way out, any suggestions please ?
I have a few spare Arduino uno's if they could be used ? If not can someone point me in the right " economical " direction please :)
Many thanks 
Keith VK6EME / VK6KB






Re: Power meter to measure sun noise etc.

KENT BRITAIN
 

Charlie, G3WDG did this some years ago.

He came off the 144 MHz IF with a few stages of MMIC's.  This brought the noise floor
up enough to deflect the Power Peter and directly read dB Noise Power.

Just how much MMIC gain you need depends on how much gain you have in your
3 cm Preamps, Xverter gain, and IF gain.  Also just how sensitive your Power Meter is.

But it is a valid way to measure Sun, Moon, and Earth/Sky noise.

73  WA5VJB/G8EMY



From: "vk6xh@... [ukmicrowaves]"
To: ukmicrowaves@...
Sent: Sunday, October 1, 2017 7:42 AM
Subject: [ukmicrowaves] Power meter to measure sun noise etc.

 
Whilst I do have a HP 5348A power meter I'm looking for something to use when portable to check sun/ moon noise at my 144 mhz IF on the 3 cms EME setup.
Not wishing to re invent the wheel and as always looking for the easy way out, any suggestions please ?
I have a few spare Arduino uno's if they could be used ? If not can someone point me in the right " economical " direction please :)
Many thanks 
Keith VK6EME / VK6KB