Date   
Re: March 23cm UK Activity Contest - Report

gm4cxm <gm4cxm@...>
 

--- In ukmicrowaves@..., "Martin A Hall" <gorrell77@...> wrote:

You also missed the IO78 multiplier - HI!
Sorry Martin, correct!
I didn't spot the one aircraft your observed due to having my browser view of aircraft traffic lower down over the UK and over the North Sea. Following previous information from Kjeld, later in the contest I opened up another window keeping planefinder in one and flightradar24 in another as occasionally one shows an "off coast" North Sea flight before the other. I will make a mental note in future to have the second browser window looking for North American traffic heading towards our Invergarry mid-point.


attempts with 3 stations nothing was heard at either end. Nothing heard from anyone on tropo, either.
I still have to break my duck in the 1296 MHz UKAC, and expect to be on for the full duration of the contest next month.

You're a credit to the microwave community Martin.
There you are and to quote Runrig, on "The Edge of the World" and not have continental or much UK activity on your doorstep and yet still appear every month in the hope of even one contact which I know you would put an entry in for, however small. Keep up the good work and may your perseverance pay off.

73 Ray GM4CXM

Re: March 23cm UK Activity Contest - Report

Robert Price <g8dtf@...>
 

Hi Tony
 
A pretty frustrating evening here as well. I finally got round to measuring the real power out of my amplifier with the HP432. It only measures +37dBm or about 5W.
 
The rest of the evening is then understandable. Mostly contact in IO83, but also worked IO82, IO74 and IO92. I heard and called a lot more though.
 
GM4CXM IO75
G4BRK IO91
G0MJW 1091
G8CUL IO91
M0GHZ IO81
GM7GDE IO7?
GM4JR IO85
 
I will have to get an amplifier built!
 
73
 
Bob
G8DTF


From: willcroft
To: ukmicrowaves@...
Sent: Wed, 16 March, 2011 12:21:31
Subject: [ukmicrowaves] Re: March 23cm UK Activity Contest - Report

 

Very variable conditions here.
Initially, other than G4BRK I struggled to escape from IO83, although I did get IO82 it was only 57km.

Things improved giving PA0EHG, although I lost PE1EWR. :-(
Failure again with GM4PPT but success with GM4LBV.

It seemed to be busy although there was a lull, around 10pm, and I missed some locals.
No one heard from JO01 but, at 13, the largest number of UK squares I have worked in a contest.

A couple of attempts with GM8IEM didn't produce a contact.

I'll send a mast photo if you wish Sam.

Cheers

Tony


Re: March 23cm UK Activity Contest - Report

SAM JEWELL
 

Hi Tony,
Yes please. All photos appreciated.

73 de Sam



Sent tomorrow from my time machine


On 16 Mar 2011, at 12:21, "willcroft" <gw8asd@...> wrote:

 

Very variable conditions here.
Initially, other than G4BRK I struggled to escape from IO83, although I did get IO82 it was only 57km.

Things improved giving PA0EHG, although I lost PE1EWR. :-(
Failure again with GM4PPT but success with GM4LBV.

It seemed to be busy although there was a lull, around 10pm, and I missed some locals.
No one heard from JO01 but, at 13, the largest number of UK squares I have worked in a contest.

A couple of attempts with GM8IEM didn't produce a contact.

I'll send a mast photo if you wish Sam.

Cheers

Tony

Re: March 23cm UK Activity Contest - Report

Tony Pugh GW8ASD
 

Very variable conditions here.
Initially, other than G4BRK I struggled to escape from IO83, although I did get IO82 it was only 57km.

Things improved giving PA0EHG, although I lost PE1EWR. :-(
Failure again with GM4PPT but success with GM4LBV.

It seemed to be busy although there was a lull, around 10pm, and I missed some locals.
No one heard from JO01 but, at 13, the largest number of UK squares I have worked in a contest.

A couple of attempts with GM8IEM didn't produce a contact.

I'll send a mast photo if you wish Sam.

Cheers

Tony

10 GHz 20 W Linear Amplifier

Norman <norman.d.stewart@...>
 

I am planning to get back on 1296 MHz sometime during the spring and I am after a 100 W linear amplifier.

I have a commercial 10 GHz, 20 W TWT amplifier complete with mains PSU, 4 kV HT PSU, forced air cooling, interlocks and control circuitry. The mains PSU is a separate unit approximately 200 x 150 x 100 mm, everything else is housed in a 3U, 19 inch rack mount enclosure. RF drive and RF output terminations are precision N type sockets. Transmit/Receive switching relays are not included.

I will swap the 10 GHz kit for a 1200 to 1300 MHz, 100 W linear amplifier or may accept a cash offer. Buyer to collect from Edinburgh or alternatively I can deliver to the Norbreck rally at Blackpool on 10th April 2011.

 

73 de Norman GM1CNH

Re: March 23cm UK Activity Contest - Report

SAM JEWELL
 

I would echo what Ray says. Better at the beginning, tailing off as the evening wore on. I was surprised to work Gordon, GI6ATZ, on SSB. That is usually a difficult one for me
A few attempts towards the east ended in failure, although DF9IC is in the log again with SSB, but finishing off on CW. It might have been a plane at the start, but if so it produced a long reflection. It was only some QRM that prolonged the contact and led to the eventual use of CW for the final Rs. Two attempts with GM stations failed to produce any sign of a signal. I will have to put the second 44 element back up for the next one.

I will include a short report on the 23cm contest in my next column ( due in today)! I am still short of a few photos on stations and/or antenna systems for 23cm and above. If anyone can help with suitable photos, please? Preferably larger than 300kb to satisfy Radcom's requirements.

I look forward to working many of you on 3cm in next week's 13cm and up UKAC contest.

Does anyone have an independent confirmation of G3JHMs passing? ALL reports I have seen, so far, have originated in Canada.

73 de Sam, G4DDK



Sent tomorrow from my time machine


On 16 Mar 2011, at 01:06, Ray James <gm4cxm@...> wrote:

 


This evenings 23cm UK Activity Contest was certainly an interesting one for its variables.

Conditions in the first hour were well above average with some pretty good signals from distant stations via tropo. A number of stations that are usually worked on CW were contacted on SSB for a change. I managed 17 contacts during this period including PA0EHG (JO22) on SSB via aircraft reflection.
The remaining 90 minutes produced a further 10 contacts as conditions (and aircraft numbers) fell away though OZ1FF was worked off an aircraft before the skies get too empty.
QSB caused a problem on a few contacts, taking out the odd needed letter or number at a crucial point.

Activity was well up though I missed IO81, 82, 93 and JO01 multipliers this month. Everyone appeared to be busy scrambling to get another contact into the log just before the end. Always a good sign of the interest and level of activity nationwide on 23cm.
There were at least 12 stations in Scotland active during the contest.

My QSO map can be found at http://maps.google.com/maps?q=http://www.rsgbcc.org/vhf/kml_files/2011/D5bACxUHMD8xAV2HUlcaQTr2lCx2d4W

73 Ray GM4CXM IO75TW
IC910HX DL2AM PA 150w
4x44 el Wimo's + SP23mk2 LNA


Re: March 23cm UK Activity Contest - Report

Martin A Hall <gorrell77@...>
 


Hi Ray,
 
You also missed the IO78 multiplier - HI!  Very interesting to read about conditions.
 
I didn't get onto the band until 9.45 pm, since I was working earlier.  Only one aircraft passed over Scotland before the end of the contest that might have produced a QSO, but despite attempts with 3 stations nothing was heard at either end.  Nothing heard from anyone on tropo, either. 
 
I still have to break my duck in the 1296 MHz UKAC, and expect to be on for the full duration of the contest next month.  Hopefully the new VLNA will be at the masthead by then.
 
73,
Martin
GM8IEM - IO78HF
 
IC910, 150w linear, m/h preamp, 39el quad loop yagi. 
 

----- Original Message -----
From: Ray James
Sent: Wednesday, March 16, 2011 1:06 AM
Subject: [ukmicrowaves] March 23cm UK Activity Contest - Report

 


This evenings 23cm UK Activity Contest was certainly an interesting one for its variables.

Conditions in the first hour were well above average with some pretty good signals from distant stations via tropo. A number of stations that are usually worked on CW were contacted on SSB for a change. I managed 17 contacts during this period including PA0EHG (JO22) on SSB via aircraft reflection.
The remaining 90 minutes produced a further 10 contacts as conditions (and aircraft numbers) fell away though OZ1FF was worked off an aircraft before the skies get too empty.
QSB caused a problem on a few contacts, taking out the odd needed letter or number at a crucial point.

Activity was well up though I missed IO81, 82, 93 and JO01 multipliers this month. Everyone appeared to be busy scrambling to get another contact into the log just before the end. Always a good sign of the interest and level of activity nationwide on 23cm.
There were at least 12 stations in Scotland active during the contest.

My QSO map can be found at http://maps.google.com/maps?q=http://www.rsgbcc.org/vhf/kml_files/2011/D5bACxUHMD8xAV2HUlcaQTr2lCx2d4W

73 Ray GM4CXM IO75TW
IC910HX DL2AM PA 150w
4x44 el Wimo's + SP23mk2 LNA


Nordic Activity Contest Report from OZ1FF in JO45BO at 1,3 GHz

oz1ff <oz1ff@...>
 

Contest : NAC 1296 MHz
Date : 2011 Mar 15
Section : 7A
QTH : DK-6853 Vejers Strand

TX : FLEX-1500/MKU13G2/PA, 145 W
RX : FLEX-1500/MKU13G2/LNA
Antenna : 1,5m dish, 18 mAGL, 23 mASL
Log : TACLog by OZ2M, 2.02, http://www.rudius.net/oz2m

QSOs : 33
-invalid: 0 Points/valid QSO
-valid : 33 QSO-points (*1) : 14803 449
WWLs : 27 WWL bonus (500) : 13500 409
DXCCs : 8 DXCC bonus (0) : 0 0
------------------------------ ------
Total score : 28303 858

ODX : SP4MPB in KO03HT at 827 km AR on B737 in FL410

Worked World Wide Locators:
IO75: 1 JO32: 1 JO50: 2 JO65: 3 JO75: 1 JO86: 1
JN48: 1 JO42: 1 JO54: 1 JO66: 1 JO77: 1 JO89: 1
JO02: 1 JO45: 1 JO58: 2 JO67: 1 JO78: 1 JO99: 1
JO21: 1 JO46: 1 JO59: 1 JO68: 1 JO79: 2 KO03: 1
JO22: 2 JO47: 1 JO64: 1

Worked DXCCs:
DL : 6 GM : 1 OZ : 6 PA : 3 SM : 14 SP : 1
G : 1 LA : 1

Top 10 QSO-points:
20110315 2002 SP4MPB 519 015 519 KO03HT 827
20110315 2159 GM4CXM 529 033 529 IO75TW 782
20110315 1929 DF9IC 529 012 529 JN48IW 743
20110315 1845 SK0CT 529 007 529 JO99BM 738
20110315 1830 SM0ERR 529 006 559 JO89WJ 718
20110315 2052 DL6NAA 519 023 519 JO50VF 647
20110315 2142 G3XDY 539 032 529 JO02OB 601
20110315 1858 SA4Z 529 009 529 JO79OF 585
20110315 1915 SM4RPP 529 010 519 JO79HH 567
20110315 1952 DL2ALF 529 014 559 JO50IW 547

73
Kjeld B. Thomsen, OZ1FF

March 23cm UK Activity Contest - Report

Ray James <gm4cxm@...>
 

This evenings 23cm UK Activity Contest was certainly an interesting one for its variables.

Conditions in the first hour were well above average with some pretty good signals from distant stations via tropo. A number of stations that are usually worked on CW were contacted on SSB for a change. I managed 17 contacts during this period including PA0EHG (JO22) on SSB via aircraft reflection.
The remaining 90 minutes produced a further 10 contacts as conditions (and aircraft numbers) fell away though OZ1FF was worked off an aircraft before the skies get too empty.
QSB caused a problem on a few contacts, taking out the odd needed letter or number at a crucial point.

Activity was well up though I missed IO81, 82, 93 and JO01 multipliers this month. Everyone appeared to be busy scrambling to get another contact into the log just before the end. Always a good sign of the interest and level of activity nationwide on 23cm.
There were at least 12 stations in Scotland active during the contest.

My QSO map can be found at http://maps.google.com/maps?q=http://www.rsgbcc.org/vhf/kml_files/2011/D5bACxUHMD8xAV2HUlcaQTr2lCx2d4W

73 Ray GM4CXM IO75TW
IC910HX DL2AM PA 150w
4x44 el Wimo's + SP23mk2 LNA

Re: GB3MHX

Arie Dogterom <pa0ez@...>
 

Hi,
One of the main reasons for using fsk callsigns on the beacons is that one can tune the beacon in such a way that the shift does goes out of the rx passband, thus making a constant S-meter deviation possible while using the beacon for setting up/ optimizing the RX.
I think this is a more important matter than trying to rx beacons as far away as possible.
 
However the discussion is very instructive
 
73
Arie
 
 

----- Original Message -----
Sent: Friday, March 04, 2011 10:32 AM
Subject: Re: [ukmicrowaves] GB3MHX

 

Indeed.   Its probably not very relevent to microwaves, and only applies when someone wants to monitor in a bandwidth significantly lower than the on-off keying rate.   Which for CW means in around 1Hz or lower.
 
The modulated tone  appears as a carrier multiplied by a random sequence of 1's and 0's  (*)  corresponding to the keying waveform.  If coherency isn't maintained for each time the signal returns to the mark frequency a randomised start phase is added-in as well.   So you have introduced both AM and randomised Phase Shift keying.   The AM part alone will split the output into a set of sidebands (or more likely pseudo noise spectrum) following a precise sin(x)/x roll off at the keying rate.  But there will ALWAYS be one absolutely stable invarient single tone at the exact centre - the carrier.   Think normal old-fashioned AM;  the stable cvarrier is always there
 
The second, the phase shift, is much worse worse.   Recall that Phase Modulation is the same as FM except for an inherent  linear rising frequency/amplitude component.  Ie Phase Mod is the differential of FM.  Now imagine the otherwise pure residual single tone at the carrier centre being Frequency Modulated by a series of sharp impulses (the edges of the keying waveform).  It cannot survive, and spreads out into an unpredictable way based on modulation index in a horrible non-linear way involving Bessell functions.   Try tuning in the carrier of an FM signal on an SSB receiver - and wonder why the tone dissappears as soon as any modulation appears
 
As I said, probably not very important on the higher uWave bands as there are plenty of other mechanisms that case residual FM / PM.  In my case the dish flapping about on the end of a pole in the wind introduces a random few Hz on GB3SCX, which is comparable to that on the signal itself due to the simple GPSDO approach.

Andy
G4JNT
 
(*)  I get really irritated when plurals get wrongly capitalised by the non-cognescenti, especially in public signs. "Apple's and Orange's" for example.  Apple's and Orange's what?.   But for special cases, like the plural of single digits, it is really the only way.  After all, 1s means one second.  
I thoroughly recommend that anyone who cares about the mangling of grammar and language should read  "Eats, Shoots & Leaves" by Lynne Truss.
 
 
 
 
On 3 March 2011 23:18, David GM6BIG <freevil@...> wrote:
 

Hi All,
 
I have had a few requests to make sure GB3CSB keeps its long plain carrier.
To that end, I have kept the first 30s of the odd minute reserved for that.
As an operator (OK, very occasional operator), I understand the need to accomodate the human ear.
Although the JT4 "skirl" is in someways easier to pick out of the noise !
 
The most common appreciation, is just that its GPS locked.
One variable removed when searching.
 
Andy,
I hadent appreciated the phase changing aspect.
Can you explain why its so detrimental ?
Im assuming its something to do with the recovery using FFT ???
 
 
Cheers, DAvid
 
----- Original Message -----
Sent: Thursday, March 03, 2011 10:59 PM
Subject: Re: [ukmicrowaves] GB3MHX

Many beacons do send CW too often - or they used to.   I know we have now defined a period of carrier of at least 20 seconds, in the latest specification; but legacy ones still abound.    
 
 
Both FSK schemes generate keyclicks, but coherent,or FEK, is worse - especially far out -  since at each transition the signal waveform shifts abruptly..   With the conventional continuous phase method, if you hard switch the frquency shifting element you cause a near-instananeous shift in rate of change of the waveform, but the instantaneous value doesn't jump.
(Both assuming arbitrarily-infinite bandwidth in the keying and subsequent Tx circuitry)
 
The result with the latter is that keyclicks fall off at an additional 6dB / octave (of keying rate) on top of the SIN(x)/x you get from the FEK version.  So very close in, not a lot of difference, but far out, huge.   
 
For On/Off,  amplitude shaping solves everything except ease of implementation (perhaps a mixer/upconverter solution to beacons really is a good idea after all - is it the Manchester ones that do that?)   On GB3VHF a simple linear ramped waveform for the keying was generated in the DDS and this went some way to reducing key clicks (although a crystal filter was subsequently added for other reasons).    On all the GB3RALs, (and originally tested on  GB3SSS)  the keying amplitude is changed using a raised-cosine shape for even better sidelobe tailoring, and no xtal filter needed.

However,  -80dBc at a few kHz away its not usually a great problem - except when you leave as close to the beacons as I believe you do.
 
Ironically, the best waveform for pure signal detection / monitoring is a plain carrier, or a spread spectrum waveform with a-priori knowledge of the code and timing.   Now, who will be the first with a precision PN code.  
 
If the spread spectum waveform were 1kHz wide (chip rate), and a PN code of 4095 length, so it repeated every 4 seconds, would offer an effective detection bandwidth of 0.25Hz, but with the scatter-decorrelation properties of 1kHz wide signalling.  Pity about the need for the code acquisition process, but it just means a longer time spent on initial searching.   GPS manages it every time you switch a receiver on..
 
Just fantasising - or not...............
 
Andy
 
 
 
On 3 March 2011 22:18, G3XDY <g3xdy@...> wrote:
 

Hi Andy,
 
Very interesting, but the argument seems predicated on the beacon sending CW continuously. A beacon with a long period of unmodulated carrier allows that carrier to be detected in a very narrow bandwidth, irrespective of the disturbances caused by the random phase during the keying sequence.
 
Switching between oscillators sounds like a recipe for severe key clicks to me unless there is a narrow filter after the switch to remove higher order keying sidebands.
 
73
John  G3XDY 
----- Original Message -----
Sent: Thursday, March 03, 2011 9:54 PM
Subject: Re: [ukmicrowaves] GB3MHX

Yes, if FSK keying not received as two separate tones with one compared in power against the other, its just two on-off signals.  In which case FSK keying has no more to offer than actual on/off - apart from ease of implementation.  
 
Furthermore, FSK CW as it is implemented on all beacons - and including DDS ones - leads to an unfortunate artefact that true on-off doesn't result in.   If you want to integrate over a long period - ie monitor in a bandwidth significantly lower than that needed to get the on-off bits through - the FSK desroys the coherency so each return to the mark or space frequency ends up at a different phase to what it would have been had a carrier alone been transmitted.
 
The result is that it is now not possible to look for signals in any bandwidth lower than the symbol rate.  That was the reason we went for true hard switch on/off keying on the Bell Hill beacons.   There, it is possible to monitor over the complete  CW / carrier period  in bandwidths significantly lower than 10Hz and still get (theoretically anyway) a single spectral line. 
 
Probably not all that important on the uWave bands where scattering will broaden to a few Hz, but the concept is there.  
 
True on/off is more complicated to implement, and I know if done on MH* would annoy more than one local :-) but well worth it on a remote beacon when building from scratch.  
 
The other alternative that offers best of both worlds is coherent FSK, where two oscillators run continuously and you switch between them.   G0MRF pointed me at this chip only a few hours ago : 
which is one of the only few ways to actually do coherent FSK.
 
In fact this FSK coherency problem cropped up at the other end of the spectrum very recently, when someone was testing using 30s slow DFCW on 8.9kHz (and yes, I do mean 8900Hz).    Another station was monitoring the signal using a 600s (1.67mHz) bandwidth but only got a broad hump rather than a single spectral line due to the loss of phase contimuity.
 
To solve it I put together a DDS using just a PIC with code that can generate coherent FSK as well as teh radionaly solution so people can do direct comparisons.
www.g4jnt.com/PIC_DDS.pdf   and   www.g4jnt.com/PIC_DDS.zip for the full archive
 
Pictures of the results compared are at   www.g4jnt.com/FSK_Types.pdf
 
The PIC/DDS will generate up to 10kHz, so could be used at audio to drive an SSB Tx with audio.   A PIC with more I/O pins would be able to drive a dual I/Q D/A for a direct quadrature upconcverter.  There are just-about enough clock cycles to be able to do quad outputs.
 
Andy
G4JNT
 


 
On 3 March 2011 21:22, Sam Jewell <jewell@...> wrote:
 

Yes, I think Andy may have been referring to the use of SSB filters to move the spacer tone out of the received passband so it sounds like CW.

73 de Sam




Sent tomorrow from my time machine


On 3 Mar 2011, at 21:01, "Arie Dogterom" <pa0ez@...> wrote:

 

Anyhow the morse from martlesham is coded onto FSK.
Arie
 
----- Original Message -----
Sent: Thursday, March 03, 2011 7:10 PM
Subject: Re: [ukmicrowaves] GB3MHX

 

Morse is incoherent in the sense it can  ONLY be received by looking for presence or absence of power in a timeslot.   But the timeslots are not defined (actually, on a beacon keyer they probably are, but its not guaranteed).   If they were defined properly, a computer could almost certainly do as well as, better, than an ear.  But only if timing were precise.
 
ANything designed for human reception is bound to be incoherent.
 
In that sense, JT4 is also incoherent, but with decent FEC, narrower bandwidth, rigid timing control it can get you an extra 6dB of  S/N capability.  And it does.
 
I keep harking back to thinking about proper coherent signalling -  PSK based.  It can theoretically give 3dB improvement over incoherent signalling for a given symbol rate, but the clock recovery that is essential for a true coherent modulation type is going to throw away all the advantages gained.   Which is why the WSJT suite are all using incoherent MFSK waveforms..
 
With GPS timing offering 50ns repeatability on the timing pulse,  and sub PPB frequency stability, it may just about be possible to think about microwave weak signal PSK,  and letting GPS timing look after recovery rather than noise-prone non-linear recovery circuits.
 
Andy


 
On 3 March 2011 17:56, Ralph Bird <Ralph.Bird@...> wrote:
 

Incoherent?  I suggest not, ;-)
 you dont need a computer to understand what is is conveying.
 
Ralph
 
----- Original Message -----
Sent: Thursday, March 03, 2011 5:45 PM
Subject: Re: [ukmicrowaves] GB3MHX

 

Are you intentionally  not implementing JT4 on 'MHX.?
 
If the GPS and everything is there in teh way of hardware, , seems a pity to throw away somthing like 6dB in weak signal detection capability with just incoherent on-off modulation..
 
Andy


 
On 2 March 2011 12:30, SAM JEWELL <jewell@...> wrote:
 

Folks,
GB3MHX has returned to service this morning after a very brief break in service. It is now GPS locked on 10368.830MHz.
Unlike some other beacons using the RDDS, MHX does not have JT4 modulation.
We would appreciate any reception reports to check that it is still getting out as usual.
Reports to either Jason, G7OCD, the NoV holder or to myself. Also spot it on Beaconspot, please.
 





Re: HP333144A pin diode switch

Andy G4JNT
 

10mA is usually enough for full attenuation.  
Open circuit (or possibly a couple of volts reverse bias) for no attenuation.
 
Andy


 

On 15 March 2011 20:40, Chris <chris.yln@...> wrote:
 

Hi David yes I had to many 3s
do you know what the bias control is
Chris
----- Original Message -----
From: "David Barber" <david.barber@...>
To: <ukmicrowaves@...>
Sent: Tuesday, March 15, 2011 7:57 PM
Subject: RE: [ukmicrowaves] HP333144A pin diode switch

>
> Is that not one too many 3s?
>
> Could it be this one?
>
> HP Agilent 33144A RF Microwave Coaxial Switch
>
> Alternative HP number: 11720-60010
> PIN RF Microwave Coaxial Switch.
> Frequency range of 0.1 to 18 GHz.
>
>
> SPST PIN Microwave Switch
> 0.1 to 18.0 GHz
> SMA Female / Female (In / Out)
> SMC connector (Bias) control
> 35-80 dB On/Off Ratio
> Condition: Used / Working
> SPST function
>
> ********
>
>
>
> -----Original Message-----
> From: ukmicrowaves@... [mailto:ukmicrowaves@...]
> On
> Behalf Of Chris
> Sent: 15 March 2011 18:16
> To: ukmicrowaves@...
> Subject: [ukmicrowaves] HP333144A pin diode switch
>
> Hi I am looking for info on a HP333144A pin diode switch
> thanks Chris
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 10.0.1204 / Virus Database: 1498/3507 - Release Date: 03/14/11
>


Re: HP333144A pin diode switch

David Barber <david.barber@...>
 

No idea what it requires but an email to these people might get you the
info. They list it in their HP parts list.

www.aptecelectronics.com

********

-----Original Message-----
From: Chris [mailto:chris.yln@...]
Sent: 15 March 2011 20:40
To: david.barber@...; ukmicrowaves@...
Subject: Re: [ukmicrowaves] HP333144A pin diode switch

Hi David yes I had to many 3s
do you know what the bias control is
Chris
----- Original Message -----
From: "David Barber" <david.barber@...>
To: <ukmicrowaves@...>
Sent: Tuesday, March 15, 2011 7:57 PM
Subject: RE: [ukmicrowaves] HP333144A pin diode switch



Is that not one too many 3s?

Could it be this one?

HP Agilent 33144A RF Microwave Coaxial Switch

Alternative HP number: 11720-60010
PIN RF Microwave Coaxial Switch.
Frequency range of 0.1 to 18 GHz.


SPST PIN Microwave Switch
0.1 to 18.0 GHz
SMA Female / Female (In / Out)
SMC connector (Bias) control
35-80 dB On/Off Ratio
Condition: Used / Working
SPST function

********



-----Original Message-----
From: ukmicrowaves@... [mailto:ukmicrowaves@...]
On
Behalf Of Chris
Sent: 15 March 2011 18:16
To: ukmicrowaves@...
Subject: [ukmicrowaves] HP333144A pin diode switch

Hi I am looking for info on a HP333144A pin diode switch
thanks Chris



------------------------------------

Yahoo! Groups Links





-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 10.0.1204 / Virus Database: 1498/3507 - Release Date: 03/14/11

Re: HP333144A pin diode switch

Chris
 

Hi David yes I had to many 3s
do you know what the bias control is
Chris

----- Original Message -----
From: "David Barber" <david.barber@...>
To: <ukmicrowaves@...>
Sent: Tuesday, March 15, 2011 7:57 PM
Subject: RE: [ukmicrowaves] HP333144A pin diode switch



Is that not one too many 3s?

Could it be this one?

HP Agilent 33144A RF Microwave Coaxial Switch

Alternative HP number: 11720-60010
PIN RF Microwave Coaxial Switch.
Frequency range of 0.1 to 18 GHz.


SPST PIN Microwave Switch
0.1 to 18.0 GHz
SMA Female / Female (In / Out)
SMC connector (Bias) control
35-80 dB On/Off Ratio
Condition: Used / Working
SPST function

********



-----Original Message-----
From: ukmicrowaves@... [mailto:ukmicrowaves@...] On
Behalf Of Chris
Sent: 15 March 2011 18:16
To: ukmicrowaves@...
Subject: [ukmicrowaves] HP333144A pin diode switch

Hi I am looking for info on a HP333144A pin diode switch
thanks Chris



------------------------------------

Yahoo! Groups Links





-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 10.0.1204 / Virus Database: 1498/3507 - Release Date: 03/14/11

Re: HP333144A pin diode switch

David Barber <david.barber@...>
 

Is that not one too many 3s?

Could it be this one?

HP Agilent 33144A RF Microwave Coaxial Switch

Alternative HP number: 11720-60010
PIN RF Microwave Coaxial Switch.
Frequency range of 0.1 to 18 GHz.


SPST PIN Microwave Switch
0.1 to 18.0 GHz
SMA Female / Female (In / Out)
SMC connector (Bias) control
35-80 dB On/Off Ratio
Condition: Used / Working
SPST function

********

-----Original Message-----
From: ukmicrowaves@... [mailto:ukmicrowaves@...] On
Behalf Of Chris
Sent: 15 March 2011 18:16
To: ukmicrowaves@...
Subject: [ukmicrowaves] HP333144A pin diode switch

Hi I am looking for info on a HP333144A pin diode switch
thanks Chris



------------------------------------

Yahoo! Groups Links

HP333144A pin diode switch

Chris
 

Hi I am looking for info on a HP333144A pin diode switch
thanks Chris

Re: VNA Cal Kit

g3cwi <richard@...>
 

Thanks for the kind offers (Mark, Darren and Roger). I will pop them in the post to Roger in the first instance! Are you QTHR?

I tried to get them tested today in the RF lab at a particle accelerator but they were too busy.

73

Richard
G3CWI

Re: VNA Cal Kit

Roger Ray
 

Richard,
I would be happy to measure them on a calibrated VNA to 6GHz, if you could send them.
73
Roger

--- In ukmicrowaves@..., "g3cwi" <richard@...> wrote:

Dear all

I have two calibration kits for my VNWA. However I don't know if either is "good". Does anyone here who has access to a proper calibrated VNA be willing to assess my calibration kit to (say) 2GHz?

My two kits are a homemade one and a wimo one and both seem identical in performance.

Thanks.

73

Richard
G3CWI

Re: March 23cm UK Activity Contest - Reminder

Martin A Hall <gorrell77@...>
 

I expect to be operational from about 9.45 pm, and will be on KST for skeds.
 
120w into 39 el quad loop yagi (JVL)
 
73,
Martin
GM8IEM - IO78HF
 

----- Original Message -----
From: gm4cxm
Sent: Monday, March 14, 2011 1:23 PM
Subject: [ukmicrowaves] March 23cm UK Activity Contest - Reminder

 


The next monthly 23cm UK Activity Contest takes place tomorrow evening, Tuesday 15th March between 8pm and 10.30pm.

I will be active running 150w and 4x44 + LNA and available on 'KST for schedules.

48 different stations have entered this new contest in the first two months plus lots more around to give points away. Fingers crossed we're blessed with average+ conditions and plenty aircraft to reflect off tomorrow.

73 Ray GM4CXM IO75TW

TONIGHT - RSGB 1.3/2.3GHz Activity Contest, 3/15/2011, 7:00 pm

ukmicrowaves@...
 

Reminder from:   ukmicrowaves Yahoo! Group
 
Title:   TONIGHT - RSGB 1.3/2.3GHz Activity Contest
 
Date:   Tuesday March 15, 2011
Time:   7:00 pm - 9:30 pm
Repeats:   This event repeats every month on the third Tuesday.
Notes:   RSGB 1.3/2.3GHz Activity Contest. Exchange is serial number and locator. 1900-2130z.
 
Copyright © 2011  Yahoo! Inc. All Rights Reserved | Terms of Service | Privacy Policy

Re: VNA Cal Kit

Mark GM4ISM
 

Richard
If you are up this way I can probably help.
I don't have a VNA but I have access to a calibrated modern R&S spec analyser & tracking generator, a Wiltron VSWR bridge with 46dB directivity & a cal kit with precision loads (50dB ret loss), precision open and shorts all rated to 2GHz and beyond.
The bridge and load are no longer formally calibrated, but I am able to check them regularly, against equipment that is.
Regards
Mark GM4ISM

From: g3cwi
Sent: Monday, March 14, 2011 8:27 PM
Subject: [ukmicrowaves] VNA Cal Kit

 

Dear all

I have two calibration kits for my VNWA. However I don't know if either is "good". Does anyone here who has access to a proper calibrated VNA be willing to assess my calibration kit to (say) 2GHz?

My two kits are a homemade one and a wimo one and both seem identical in performance.

Thanks.

73

Richard
G3CWI