Date   

File list not updating

peter_harston@...
 


Despite not being anywhere near full, my Files list stopped updating on November 21st.   I have spent several hours checking settings and the Yahoo help files, but to no avail.

I can still access the subsequent files by clicking the URLs in individual notification e-mails, but I have to trawl the list of e-mails every time to find them.

I appreciate that I am probably overlooking something, but any thoughts on where to find the blindingly obvious would be gratefully received...

Thanks

Peter GW4JQP


Re: ADF5355 - Good Enough for 24 GHz!

Brian Flynn GM8BJF
 

Hi Paul,

A|pologies for confusion. The picture that Andy posted looks to me the same layout as the black types. It has the same legend NWDZ V2.0 as the black one I have here. It looks like they have just used a different colour of solder resist. I will post a picture of
 the green one I have. The component numbering is distinctly different from the NWDZ boards.

73s Brian GM8BJF


Re: KST and /P

Mark GM4ISM
 

Ed
Filtering should be relatively easy, I suspect that a simple  high pass  will do (a notch at 70cm a poor  second choice)
Minicircuits do a range of high and low pass filters at reasonable prices (about £35  if i recall)
 
Building such a filter say 800MHz High Pass, should be relatively easy although attention to component size and  quality (use SMD caps and inductors) and good layout will be needed to achieve a low through loss at 2100MHz
Plenty of websites that will allow you to calculate the component values
If you need such a filter testing I have sweeping testgear available
 
Mark GM4ISM
 

Sent: Sunday, December 24, 2017 10:57 AM
Subject: [ukmicrowaves] KST and /P
 
 

I have been investigating further why access to KST is so poor when operating portable from hilltops. There was a discussion in this group earlier this year that concluded that the main problem was the mobile phone router hearing too many access points. However, while this is true I have found that the performance of both of my mobile routers is significantly worse under the following conditions:
 
Proximity to a PMR site
 
Use of 2m and particularly 70cms for talkback
 
Proximity to our 70cms analogue and digital repeaters
 
In the worse case the router actually crashes when subjected to high power RF.
 
Both of my routers use the Telit HE910-D to access the mobile phone system and I note no external RF filtering, the two aerials connect directly to the package. Can anyone point me to any documentation on the RF performance of this unit, particulalrly the characteistics of any RF filtering that may be incorporated. There are a number of documents on the digital interfacing, but have found none on the RF performance.
 
Since the unit covers 850-2100 MHz I suspect there may only be a combination of HPF and LPF to define the band.
 
Is anyone aware of a commercially available filter to improve out of band rejection of such a device. Are there filter designs that can be built to improve out of band rejection or to introduce a notch at 70cms?
 
Ed G3VPF


KST and /P

Ed G3VPF
 

I have been investigating further why access to KST is so poor when operating portable from hilltops. There was a discussion in this group earlier this year that concluded that the main problem was the mobile phone router hearing too many access points. However, while this is true I have found that the performance of both of my mobile routers is significantly worse under the following conditions:

Proximity to a PMR site

Use of 2m and particularly 70cms for talkback

Proximity to our 70cms analogue and digital repeaters

In the worse case the router actually crashes when subjected to high power RF.

Both of my routers use the Telit HE910-D to access the mobile phone system and I note no external RF filtering, the two aerials connect directly to the package. Can anyone point me to any documentation on the RF performance of this unit, particulalrly the characteistics of any RF filtering that may be incorporated. There are a number of documents on the digital interfacing, but have found none on the RF performance.

Since the unit covers 850-2100 MHz I suspect there may only be a combination of HPF and LPF to define the band.

Is anyone aware of a commercially available filter to improve out of band rejection of such a device. Are there filter designs that can be built to improve out of band rejection or to introduce a notch at 70cms?

Ed G3VPF


Re: ADF5355 - Good Enough for 24 GHz!

Andy G4JNT
 

Can you post a photograph?

Andy  'jnt

On 24 December 2017 at 08:39, 'Paul Bicknell' paul@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 

Hi Brian

Thank you for the reply and attachment the point I was trying to make is my ADF5355 is different to the green" Board and a "black" board that have recently been put on the reflector as my green" Board dues not have the OB connection along top edges  but all 3 O/P are on the right hand side making  3 type’s of PCB

 

Regards Paul


Virus-free. www.avg.com


Re: ADF5355 - Good Enough for 24 GHz!

Paul G8KFW
 

Hi Brian

Thank you for the reply and attachment the point I was trying to make is my ADF5355 is different to the green" Board and a "black" board that have recently been put on the reflector as my green" Board dues not have the OB connection along top edges  but all 3 O/P are on the right hand side making  3 type’s of PCB

 

Regards Paul


From: ukmicrowaves@... [mailto:ukmicrowaves@...]
Sent: 23 December 2017 22:10
To: ukmicrowaves@...
Subject: RE: [ukmicrowaves] Re: ADF5355 - Good Enough for 24 GHz!

Hi Paul,
Regarding the inputs and outputs. You can have a complimenmtary drive for the referemce hence the two SMA sockets . The onboard reference is done that way, . I have used just one to feed a 100 MHz reference to the chip. The data sheet claims there are advatages in PN performance to using a complimentary drive for the reference but I cannot say I noticed any. I used the REF- connector, added a bridge to R8 and disconnected  L1. The fundamental VCO outputs are also complimentary and I  have only ever used one.I mainly used the "OB" output as that is the frequency doubled output.

As the boards arrive you will find the PN performance disapointing.  The main source of the noise is "baseband" noise from the LT voltage regulators. It shows on a spectral plot as large noise shoulders around the carrier. I attach a plot of what mine looked like before adding bypass caps. The noise is within the bandwidth of the PLL and modulates the VCO and so appears on the output. Until you bypass that and get rid of it you cannot see the influence of more subtle noise sources on the PLL In my experience  a "green" Board and a "black" board .both showed similar behaviour.
Hope that helps.

73s, Brian GM8BJF.


Re: ADF5355 - Good Enough for 24 GHz!

Brian Flynn GM8BJF
 

Hi Paul,
Regarding the inputs and outputs. You can have a complimenmtary drive for the referemce hence the two SMA sockets . The onboard reference is done that way, . I have used just one to feed a 100 MHz reference to the chip. The data sheet claims there are advatages in PN performance to using a complimentary drive for the reference but I cannot say I noticed any. I used the REF- connector, added a bridge to R8 and disconnected  L1. The fundamental VCO outputs are also complimentary and I  have only ever used one.I mainly used the "OB" output as that is the frequency doubled output.

As the boards arrive you will find the PN performance disapointing.  The main source of the noise is "baseband" noise from the LT voltage regulators. It shows on a spectral plot as large noise shoulders around the carrier. I attach a plot of what mine looked like before adding bypass caps. The noise is within the bandwidth of the PLL and modulates the VCO and so appears on the output. Until you bypass that and get rid of it you cannot see the influence of more subtle noise sources on the PLL In my experience  a "green" Board and a "black" board .both showed similar behaviour.
Hope that helps.

73s, Brian GM8BJF.


Re: ADF5355

Andy G4JNT
 

The way you programme the registers for the ADF5355 is more like the way you calculate values for a DDS rather than the 'classic' Fract N synth

Classic FractN like the ADF43xx:    Fout = Fref / R * (N + F / D) * Mult    ( Mult can be a divider)

ADF5355 :    Fout = Fref / R *  [N + (F1 +  F2 / D) / 2^24] * Mult      So if 24 bit resolution is satisfactory, just calculate N and F1.  Those two values will cascade in binary, and works out just  as you would for a DDS.        F2 and D2 are bought in for higher resolution for a bit of fine tuning.   Crafty!   The original ADF43xx are pretty useless - resolution wise , with a D limit of a paltry 12 bits

Andy  G4JNT

On 23 December 2017 at 21:22, geoffrey pike gi0gdp@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 

IT seems Alain Fort is ready to produce an Arduino LCD setup as he did for the ADF4351
for the ADF5355 to 1 Hz resolution


click the see more for more info as to where this will appear.
Cheers
Geoff
GI0GDP

Virus-free. www.avg.com



ADF5355

geoffrey pike
 

IT seems Alain Fort is ready to produce an Arduino LCD setup as he did for the ADF4351
for the ADF5355 to 1 Hz resolution


click the see more for more info as to where this will appear.
Cheers
Geoff
GI0GDP

Virus-free. www.avg.com


Re: ADF5355 - Good Enough for 24 GHz!

Paul G8KFW
 

Hi Brian

 

Thank you for putting the files on the reflector   we might have to start a file structure soon on the reflector

Please note I only received my first ADF 5355  4 days ago and haven’t fired it up yet but

Just one point the ADF 5355 I have has 2 inputs on the left hand side and 3 on the right hand side all in line 

so making at least 3 variants  available

regards Paul B


From: ukmicrowaves@... [mailto:ukmicrowaves@...]
Sent: 23 December 2017 17:18
To: ukmicrowaves@...
Subject: Re: [ukmicrowaves] Re: ADF5355 - Good Enough for 24 GHz!

 

 

The greenPCB at https://groups..yahoo.com/neo/groups/ukmicrowaves/files/ADF5355_Green_PCB.jpg  looks to be remarkably similar, although there are minor differences in screen print positions and some track widths.  At first sight, component references look to be the same.

 

'jnt

 

 

Virus-free. www.avg.com

 

On 23 December 2017 at 16:20, brian.flynn@... [ukmicrowaves] <ukmicrowaves@...> wrote:

 

Hi Paul,
Thanks for the suggestion of putting the files up on this reflector. For some reason that had not occured to me.
They are there now. Not sure how exactly the component values on the board follow the schematic though. the R values I can read in the loop filter on my one black specimen are different. I have also uploaded a HiRes photo of the PCB pinched from one of the Ebay adverts. I have found it useful (printed out on A4 ! ) when working on the PCB. I have not investigated the RF de-coupling of the board. The designer seems to have followed AD's recomendations there. The major departure was the the use of two LT "low noise" regulators as opposed to three of the AD "ultra low noise" parts recomended, one on each rail, AVDD, DVDD and VP5V. Incidentally the recommended part. the ADM7150 is 10 times lower noise than the LT part if the data sheet is to be beleived. I have now got some the will need a proper PCB to use them as the have the dreaded Pin 0 on the base of the package.

73s
Brian GM8BJF

 

No virus found in this message.
Checked by AVG - www.avg.com
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Re: Mutek WBFM board info

Tom GM8MJV
 

Mike,

Have uploaded the doc to the files area.

Apologies for some of the pages - dot matrix printer on yellow paper and kicking around for 20+ years does fade a little.

Any page you need re-scanned just ask.

Tom

On 23 Dec 2017, at 16:18, mike@pencoys.org.uk wrote:

yes Tom, the Solfan or equivilent heads, ex traffic light or similar.
Ok, there are far better systems available now. But none that can show how
relativly easy, and cheap, it is to get on the band. unless you know
different.


On 23 Dec 2017 at 13:06, Tom Melvin tom@tkrh.co.uk [ukmicrowaves] wrote:

Is that the old 1984 unit that used old intruder alarm heads? GOIF 107ub?

Tom
GM8MJV


On 23 Dec 2017, at 09:38, mike@pencoys.org.uk [ukmicrowaves]
<ukmicrowaves@yahoogroups.com> wrote:

Seasons wotzits, Nadelik Lowen, etc.

Has anyone got the paperwork for Chris' Mutek wbfm 10ghz board?.
any info appreciated.
thanks, Mike G8NXD/M3MSM


Re: ADF5355 - Good Enough for 24 GHz!

Andy G4JNT
 

The greenPCB at https://groups.yahoo.com/neo/groups/ukmicrowaves/files/ADF5355_Green_PCB.jpg  looks to be remarkably similar, although there are minor differences in screen print positions and some track widths.  At first sight, component references look to be the same.

'jnt


Virus-free. www.avg.com

On 23 December 2017 at 16:20, brian.flynn@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 

Hi Paul,
Thanks for the suggestion of putting the files up on this reflector. For some reason that had not occured to me.
They are there now. Not sure how exactly the component values on the board follow the schematic though. the R values I can read in the loop filter on my one black specimen are different. I have also uploaded a HiRes photo of the PCB pinched from one of the Ebay adverts. I have found it useful (printed out on A4 ! ) when working on the PCB. I have not investigated the RF de-coupling of the board. The designer seems to have followed AD's recomendations there. The major departure was the the use of two LT "low noise" regulators as opposed to three of the AD "ultra low noise" parts recomended, one on each rail, AVDD, DVDD and VP5V. Incidentally the recommended part. the ADM7150 is 10 times lower noise than the LT part if the data sheet is to be beleived. I have now got some the will need a proper PCB to use them as the have the dreaded Pin 0 on the base of the package.

73s
Brian GM8BJF



Re: New file uploaded to ukmicrowaves

Andy G4JNT
 

... and I've just uploaded a photo of the Green PCB - after it's been modded for external input.

'Andy  G4JNT


Virus-free. www.avg.com

On 23 December 2017 at 16:22, <ukmicrowaves@...> wrote:
 

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the ukmicrowaves
group.

File : /ADF5355_Black_PCB.png
Uploaded by : gm8bjf <brian.flynn@...>
Description : Photo of black ADF5355 PCB.

You can access this file at the URL:
https://groups.yahoo.com/neo/groups/ukmicrowaves/files/ADF5355_Black_PCB.png

To learn more about file sharing for your group, please visit:
https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398

Regards,

gm8bjf <brian.flynn@...>



New file uploaded to ukmicrowaves

ukmicrowaves@...
 

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the ukmicrowaves
group.

File : /ADF5355_Green_PCB.jpg
Uploaded by : andy_jnt <andy.g4jnt@gmail.com>
Description : ADF5355 Green PCB

You can access this file at the URL:
https://groups.yahoo.com/neo/groups/ukmicrowaves/files/ADF5355_Green_PCB.jpg

To learn more about file sharing for your group, please visit:
https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398

Regards,

andy_jnt <andy.g4jnt@gmail.com>


New file uploaded to ukmicrowaves

ukmicrowaves@...
 

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the ukmicrowaves
group.

File : /ADF5355_Black_PCB.png
Uploaded by : gm8bjf <brian.flynn@tiscali.co.uk>
Description : Photo of black ADF5355 PCB.

You can access this file at the URL:
https://groups.yahoo.com/neo/groups/ukmicrowaves/files/ADF5355_Black_PCB.png

To learn more about file sharing for your group, please visit:
https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398

Regards,

gm8bjf <brian.flynn@tiscali.co.uk>


Re: ADF5355 - Good Enough for 24 GHz!

Brian Flynn GM8BJF
 

Hi Paul,
Thanks for the suggestion of putting the files up on this reflector. For some reason that had not occured to me.
They are there now. Not sure how exactly the component values on the board follow the schematic though. the R values I can read in the loop filter on my one black specimen are different. I have also uploaded a HiRes photo of the PCB pinched from one of the Ebay adverts. I have found it useful (printed out on A4 ! ) when working on the PCB. I have not investigated the RF de-coupling of the board. The designer seems to have followed AD's recomendations there. The major departure was the the use of two LT "low noise" regulators as opposed to three of the AD "ultra low noise" parts recomended, one on each rail, AVDD, DVDD and VP5V. Incidentally the recommended part. the ADM7150 is 10 times lower noise than the LT part if the data sheet is to be beleived. I have now got some the will need a proper PCB to use them as the have the dreaded Pin 0 on the base of the package.

73s
Brian GM8BJF


New file uploaded to ukmicrowaves

ukmicrowaves@...
 

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the ukmicrowaves
group.

File : /ADF4351_schematic.pdf
Uploaded by : gm8bjf <brian.flynn@tiscali.co.uk>
Description : Circuit of the "black" Chinese ADF4351 PCB

You can access this file at the URL:
https://groups.yahoo.com/neo/groups/ukmicrowaves/files/ADF4351_schematic.pdf

To learn more about file sharing for your group, please visit:
https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398

Regards,

gm8bjf <brian.flynn@tiscali.co.uk>


New file uploaded to ukmicrowaves

ukmicrowaves@...
 

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the ukmicrowaves
group.

File : /ADF5355_schematic.pdf
Uploaded by : gm8bjf <brian.flynn@tiscali.co.uk>
Description : Circuit of "black" Chinese ADF5355 PCB

You can access this file at the URL:
https://groups.yahoo.com/neo/groups/ukmicrowaves/files/ADF5355_schematic.pdf

To learn more about file sharing for your group, please visit:
https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398

Regards,

gm8bjf <brian.flynn@tiscali.co.uk>


Re: Mutek WBFM board info

Tom GM8MJV
 

Is that the old 1984 unit that used old intruder alarm heads?   GOIF 107ub?

Tom
GM8MJV


On 23 Dec 2017, at 09:38, mike@... [ukmicrowaves] <ukmicrowaves@...> wrote:

 

Seasons wotzits, Nadelik Lowen, etc.

Has anyone got the paperwork for Chris' Mutek wbfm 10ghz board?.
any info appreciated.
thanks, Mike G8NXD/M3MSM



Re: ADF5355 - Good Enough for 24 GHz!

Neil Smith G4DBN
 

I wondered about that as well, but the PTI XO5051 and Valpey-Fishers I am using have positive slope, so I didn't need to try it.

Beware of the cheap PTIs, I bought three from China, one was DOA, another only produced -11dBm, the other was perfect.  I did get a no-quibble refund though. The slightly more expensive ones liek item 252616031486 do state that they are tested before dispatch.

The Valpey-Fisher locks at 1.783V and has a +234Hz/V slope and makes +13dBm.  The good PTI puts out +21dBm and is spot on at 2.180V.

As Andy said before, for most practical uses, there is no need to lock these things, they stay very solidly on frequency. You could build one into an insulated box with a gel cell to keep it running, but the main influence I found was in the resistive divider.  I use a very good 22 turn Bourns 10K pot and two identical 4k7s from the ends to ground and the vref out, and the resistors are glued to each other and the case of the OCXO, as is the pot, then the whole lot is encased in a layer of soft foam and that is pressed into a carved cavity in a block of polystyrene.

Neil G4DBN



On 23/12/2017 09:08, Andy Talbot andy.g4jnt@... [ukmicrowaves] wrote:
 
OK How does this work ?

In the HMC1031 Data sheet, for VCOs with negative tuning slope it says   " ...  connect the loop filter AC ground to VCC instead of GND.."    Normally for -Ve slope VCOs you need to swap the pulse up and pulse down pins, or add an inverting amplifier.   How can changing the AC ground affect the tuning direction.