Date   

Re: Faulty Ecoflex 15

Dr. David Kirkby <drkirkby@...>
 

On 8 December 2013 17:32, g4bao <john@g4bao.com> wrote:
I have an approx 30m length of Ecoflex 15 (NOT Plus) terminated in a solder PL259 and a Solder N Male.

The spec suggests a loss of 0.6dB @50MHz , 0.75@144MHz, 1.9@432 and 3@1296.

My HP VNA measures 1.0 dB@50MHz , 2@144MHz, 4@432 and 9dB@1296..
Clearly something is wrong!
Do you have option 010 on your VNA? If so, it might be worth looking
at the cable impedance as a function of distance along the line. You
might something is wrong at a specific point you can't see by eye.

Using PL259 at 1.3 GHz don't seem a good idea to me.

Could it be moisture?

Dave


Re: Faulty Ecoflex 15

simonchettle
 

John

 

Before condemning the cable have a think about the connectors. I use the Eco 15 “N” type connectors which are NOT soldered.  Without knowing the specification of the PL259 connector at 1296 (was the design ever spect to 1GHz ?) it is not possible to say if 9dB is realistic or not.

 

Is it possible to convert to “N” type connectors which cost circa £10 each rather than scrap £150 of cable?

 

Simon

G8ATB

 

 


From: ukmicrowaves@... [mailto:ukmicrowaves@...] On Behalf Of g4bao
Sent: 08 December 2013 17:32
To: Ukmicrowaves (ukmicrowaves@...)
Subject: [ukmicrowaves] Faulty Ecoflex 15

 

 

I have an approx 30m length of Ecoflex 15 (NOT Plus) terminated in a solder PL259 and a Solder N Male. 

 

The spec suggests a loss of 0.6dB @50MHz , 0.75@144MHz, 1.9@432 and 3@1296. 

 

My HP VNA measures 1.0 dB@50MHz , 2@144MHz, 4@432 and 9dB@1296.. 

Clearly something is wrong! 

 

I've carefully re terminated it and there are no obvious dents or damage. The DC loop resistance measures spot on and the Capacitance /m measures 70pf against a spec of 77pF/m. The return loss is typically >25 dB up to about 400MHz and worst at 15 dB at 1296.

 

Has anyone else seen dodgy Ecoflex producing results like this? I'll probably have to chuck it, but I'm just curious what has happened to it and whether this is common?

 

73

 

John

 

 


Faulty Ecoflex 15

g4bao
 

I have an approx 30m length of Ecoflex 15 (NOT Plus) terminated in a solder PL259 and a Solder N Male. 

The spec suggests a loss of 0.6dB @50MHz , 0.75@144MHz, 1.9@432 and 3@1296. 

My HP VNA measures 1.0 dB@50MHz , 2@144MHz, 4@432 and 9dB@1296.. 
Clearly something is wrong! 

I've carefully re terminated it and there are no obvious dents or damage. The DC loop resistance measures spot on and the Capacitance /m measures 70pf against a spec of 77pF/m. The return loss is typically >25 dB up to about 400MHz and worst at 15 dB at 1296.

Has anyone else seen dodgy Ecoflex producing results like this? I'll probably have to chuck it, but I'm just curious what has happened to it and whether this is common?

73

John

 


Re: New Microwave SDR

Noel G8GTZ
 

Thanks Jim,

Always good to have positive / constructive feedback ;-)

23cms seems to be working reasonably well - MHL is not a strong signal at the site even on a 25 ele yagi it's only an S2 maximum under normal conditions (I can actually switch the SDR to that for a test).  I'm sure we will see more stations on during a contest ;-)

Re Graham G3TCT comment - the site is not good to the west/south west as it has some tree blockage on site and then signals have to run along the Hannington / Walbury / Westbury ridge - the Bristol beacons were always very scattered.

I'm glad nobody has commented on the 70cms performance as we know it is pretty bad but are working on it - that's the price of getting 2MHz bandwidth from an £8 dongle!  As I said it is on a vertical dipole at present as it is intended to use it for HAB reception, first flight is tomorrow apparently. 144 MHz is probably next then we're already thinking about a 10 GHz PLL LNB on a 4th one...

Re the HTML which strangely seems to have attracted most comments, Phil M0DNY (project software man) reports the following:

"I've fixed all of the HTML warnings (8 out of 9 were in the original WebSDR code!) so it now validates 100% on the W3C Checker.

 

http://validator.w3.org/check?uri=http%3A%2F%2Fwebsdr.suws.org.uk%2F


Hopefully the debate can now get back to microwaves!

Best 73

Noel - G8GTZ


Re: New Microwave SDR

Jim Davidson
 

A very welcome webpage. Well done.

I'm hearing GB3FM and maybe a hint of MHL.

I expected to see lots of stations on but it seems activity there is much like it is here in north east Scotland!

73 GM3UAG


Re: New Microwave SDR

Dr. David Kirkby <drkirkby@...>
 

On 8 December 2013 12:35, Chris Wilson <chris@chriswilson.tv> wrote:

This is how it looks here, under latest Firefox, I can see no issues:

http://www.chriswilson.tv/microwavesdr.png



--
Best Regards,
Chris Wilson.
But the problem is if one has bad HTML, which that seems to have, then
the way it displays is going to be undefined. Most browsers do a
reasonable job of displaying poor code, but often now how it was
intended. It may be ok in the latest Firefox, but its anyone guess how
it will be in the next version of Firefox.

Dave


Re: New Microwave SDR

Martin - G8JNJ
 

Hi All,


Can I respectfully suggest that folks read Noel’s original post in full?


The majority of all the subsequent topics, questions and criticisms that have been posted are quite clearly outlined and explained in his note.


Regards,


Martin – G8JNJ


www.g8jnj.webs.com




---In ukmicrowaves@..., <chris@...> wrote:



> Has that website been designed for something like IE or Chrome? I looks horrible in Firefox...

> The logo at the left hand side saying "SU<antenna picture>S" and
> "WebSDR" covers over another part of the page that says something
> about "... 23cm and soon more!" and halfway down is a white area
> with the words "Error Click for details" that I can't click on.
>
> Dave (G0DJA)




08/12/2013 12:34


This is how it looks here, under latest Firefox, I can see no issues:

http://www.chriswilson.tv/microwavesdr.png



--
Best Regards,
Chris Wilson.


Re: New Microwave SDR

Chris Wilson
 



Has that website been designed for something like IE or Chrome? I looks horrible in Firefox...
The logo at the left hand side saying "SU<antenna picture>S" and
"WebSDR" covers over another part of the page that says something
about "... 23cm and soon more!" and halfway down is a white area
with the words "Error Click for details" that I can't click on.

Dave (G0DJA)



08/12/2013 12:34


This is how it looks here, under latest Firefox, I can see no issues:

http://www.chriswilson.tv/microwavesdr.png



--
Best Regards,
Chris Wilson.


Re: New Microwave SDR

Graham Kimbell G3TCT <g3tct@...>
 

Well done chaps, looks good here on Firefox, no problems. Shame it can't hear me on 23cm though (107km west). I'll have to raise the mast and wait for a tropo lift!

It's here: http://websdr.suws.org.uk/ http://websdr.suws.org.uk/
73
Graham


Re: New Microwave SDR

Dr. David Kirkby <drkirkby@...>
 

On 8 December 2013 02:20, Dave <dave@g0dja.co.uk> wrote:




Has that website been designed for something like IE or Chrome? I looks horrible in Firefox...
It seems some bad HTML5

http://validator.w3.org/check?uri=http%3A%2F%2Fwebsdr.suws.org.uk%2F&charset=%28detect+automatically%29&doctype=Inline&group=0


Re: New Microwave SDR

Mansueto Grech <mansueto.grech@...>
 

Hi Dave,
I can't  answer that question for you, however I have tried it on both Chrome and Firefox and the display was identical or almost identical was in both cases.

73's
Mans. 9H1GB




On 8 December 2013 03:20, Dave <dave@...> wrote:
 

Has that website been designed for something like IE or Chrome?  I looks horrible in Firefox...

The logo at the left hand side saying "SUS" and "WebSDR" covers over another part of the page that says something about "... 23cm and soon more!" and halfway down is a white area with the words "Error Click for details" that I can't click on.
 
Dave (G0DJA)
 
----- Original Message -----
Sent: Saturday, December 07, 2013 8:41 PM
Subject: [ukmicrowaves] RE: New Microwave SDR

 

Oh, I forgot to mention the URL!

It's here: http://websdr.suws.org.uk/

73

Noel - G8GTZ



Re: New Microwave SDR

Mansueto Grech <mansueto.grech@...>
 

Hi again,
I meant on 70cms
73's
Mans 9H1GB


On 8 December 2013 10:12, Mansueto Grech <mansueto.grech@...> wrote:
Well don e guys,
If I may ask, is there a reason why the dx portion on the band has been left out.
It would be nice to listen to any ssb activity you guys hear from here?
73's and well done again
Mans. 9H1GB


On 7 December 2013 21:41, <noel@...> wrote:
 

Oh, I forgot to mention the URL!

It's here: http://websdr.suws.org.uk/

73

Noel - G8GTZ




Re: New Microwave SDR

Mansueto Grech <mansueto.grech@...>
 

Well don e guys,
If I may ask, is there a reason why the dx portion on the band has been left out.
It would be nice to listen to any ssb activity you guys hear from here?
73's and well done again
Mans. 9H1GB


On 7 December 2013 21:41, <noel@...> wrote:
 

Oh, I forgot to mention the URL!

It's here: http://websdr.suws.org.uk/

73

Noel - G8GTZ



Re: Kenpro KR-400RC

g4bao
 

Get bright white led and a resistor, much easier.

On 8 Dec 2013 02:25, "Dave" <dave@...> wrote:
 

I think it may be the same one as in my Yaesu G-450C as Kenpro and Yaesu units were very similar.
 
In which case, the bulb on mine has gone as well and I've been meaning to replace it with a white LED and suitable dropper resistor instead.
 
Dave (G0DJA)
 
----- Original Message -----
Sent: Saturday, December 07, 2013 9:07 PM
Subject: [ukmicrowaves] Kenpro KR-400RC

 

Hi I need to replace the bulb in my Kenpro KR-400RC
can anyone let me know where I might get one
thanks Chris


Re: Kenpro KR-400RC

Dave <dave@...>
 


I think it may be the same one as in my Yaesu G-450C as Kenpro and Yaesu units were very similar.
 
In which case, the bulb on mine has gone as well and I've been meaning to replace it with a white LED and suitable dropper resistor instead.
 
Dave (G0DJA)
 

----- Original Message -----
Sent: Saturday, December 07, 2013 9:07 PM
Subject: [ukmicrowaves] Kenpro KR-400RC

 

Hi I need to replace the bulb in my Kenpro KR-400RC
can anyone let me know where I might get one
thanks Chris


Re: New Microwave SDR

Dave <dave@...>
 


Has that website been designed for something like IE or Chrome?  I looks horrible in Firefox...

The logo at the left hand side saying "SUS" and "WebSDR" covers over another part of the page that says something about "... 23cm and soon more!" and halfway down is a white area with the words "Error Click for details" that I can't click on.
 
Dave (G0DJA)
 

----- Original Message -----
Sent: Saturday, December 07, 2013 8:41 PM
Subject: [ukmicrowaves] RE: New Microwave SDR

 

Oh, I forgot to mention the URL!

It's here: http://websdr.suws.org.uk/

73

Noel - G8GTZ


Re: Source of Diconex 17-3801 Stripline Terminators?

John Quarmby
 

Hi Anthony

Would this work - it looks similar?

http://www.rf-microwave.com/eng/catalog_view_item/0/320-terminazioni/3188-TN-J1.html

73

John G3XDY

On 07/12/2013 23:54, anthony.coldman@... wrote:
Looking  for some Diconex 17-3801 Stripline Terminators.

Could use 17-0290  or 17-0323 if you have of those. 

Anyone got some they would sell or know where I could buy some online.

Regards Anthony

 





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Source of Diconex 17-3801 Stripline Terminators?

Anthony Coldman
 

Looking  for some Diconex 17-3801 Stripline Terminators.

Could use 17-0290  or 17-0323 if you have of those. 

Anyone got some they would sell or know where I could buy some online.

Regards Anthony

 


Kenpro KR-400RC

Chris
 

Hi I need to replace the bulb in my Kenpro KR-400RC
can anyone let me know where I might get one
thanks Chris


Re: New Microwave SDR

Andy G4JNT
 

Its picking up all the SRDs in the locality
 
'jnt


 

On 7 December 2013 20:41, <noel@...> wrote:
 

Oh, I forgot to mention the URL!

It's here: http://websdr.suws.org.uk/

73

Noel - G8GTZ