Date   

Re: Q65 test 23cms tonight?

Alan Beard
 

It's 23on23 in a day or three.

Here in Sydney Australia, at 8pm local, any hope???
That's 09:00 UTC.

Alan VK2ZIW

On Thu, 18 Feb 2021 19:26:04 +0000, Conrad, PA5Y wrote
> GE chaps after try Q65 on 432 I would like to try on 1296 if anyone is available. I will be on KST.
>  
> 73
>  
> Conrad PA5Y

---------------------------------------------------
Alan VK2ZIW
Before the Big Bang, God, Sela.
OpenWebMail 2.53, nothing in the cloud.


Q65 test 23cms tonight?

Conrad, PA5Y
 

GE chaps after try Q65 on 432 I would like to try on 1296 if anyone is available. I will be on KST.

 

73

 

Conrad PA5Y


Re: Ecoflex 15?

Conrad, PA5Y
 

I am also quite sure that the Commscope equivalent would be just as good. Here SCF12-50 is the cheapest cable I can find. The spinner connectors are also cheap.

 

Look here:

 

https://awbroadcast.com/produkt/rfs-cellflex-scf12-50j-superflexible-kabel/

 

Of course Brexit has made purchasing from here or Germany most unattractive and probably Arjan the proprietor of AW broadcast will not ship to the UK. But at these prices I will not use anything else.

 

73

 

Conrad PA5Y

 

PS drop G4LOH an email he has a very nice way of doing things and it seems super reliable.

 

 

 

From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of Dave G8KHU via groups.io
Sent: 18 February 2021 18:34
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Ecoflex 15?

 

Thank you Conrad :)

I'm hoping to get a decent antenna setup erected this year and will try using SCF12-50 for the loops
73
Dave


Re: Ecoflex 15?

Dave G8KHU
 

Thank you Conrad :)

I'm hoping to get a decent antenna setup erected this year and will try using SCF12-50 for the loops
73
Dave


Re: Ecoflex 15?

Conrad, PA5Y
 

Hi Dave around 1m perhaps a bit less. I also have a trolley (hazer) system on my 2m EME system which drops into very large figure 8 loops when lowered. Also no problems. I tried it initially because it was cheap and so far I have been very pleased.

 

Of course now it will probably fail!

 

Regards

 

Conrad

 

From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of Dave G8KHU via groups.io
Sent: 18 February 2021 17:22
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Ecoflex 15?

 

Conrad

What diameter are your turning loops for LCF / SCF ?

73 Dave


Re: Radiall Relay Using Outside Spec

Mark - M0WGF
 

Thanks to all who answered my original question as Rainer said I'll give it ago. 

I have a VNWA not a NanoVNA2 it's a bit pricey to buy a new VNA just to check one relay hence the question.

The relay will not be hot switched so that won't be an issue either. 

Again thanks for the responses. 

73 Mark
M0WGF


Re: Radiall Relay Using Outside Spec

Mike Willis
 

I would not recommend hot-switching at all. The relay might be happy but the preamp won't be.
--
Mike G0MJW


Re: Ecoflex 15?

Dave G8KHU
 

Conrad

What diameter are your turning loops for LCF / SCF ?

73 Dave


Re: Ecoflex 15?

Conrad, PA5Y
 

Proper Times LMR-600UF is 13 EUR per m inc VAT here! On the other hand LCF and SCF12-50 is 3.70 EUR per m. I have been using both for turning loops for several years and so far no problems. I also have a turning loop of Ultraflex 13 and that has been OK for over 2 years.  However I don't like using it because of bad experiences with Ecoflex 15. I really would not use it ever again. I bought it from Kabel-Kusche in Dortmund so it will be authentic.

73

Conrad PA5Y


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of militaryoperator via groups.io <Military1944@...>
Sent: 18 February 2021 16:19
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] Ecoflex 15?
 
Subject: Re: [UKMicrowaves] Ecoflex 15?

Ben – have a look here: LLA400UF® ULTRA FLEX Coaxial Cable - 1M INCREMENTS (ccsukltd.co.uk) It’s an ultra-flexible version of their own-branded clone of LMR400 and they sell in 1m increments. They also do custom cables Amateur (HAM) Radio Products (ccsukltd.co.uk).
Clive G3GJA


Thanks for info Clive. 

I guess for my 10ft run I'm probably worrying too much. The other option is to mount the SGLab trvrt and pa in a box just under the antenna, might save half a db or so, hi. 

cheers, Ben. 


Re: Radiall Relay Using Outside Spec

Colin Ranson
 

Thanks for looking Dave

 

De G8LBS.

 

Sent from Mail for Windows 10

 

From: Dave G8KHU
Sent: 18 February 2021 15:58
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Radiall Relay Using Outside Spec

 

Just had a browse on the Radiall website and found this:

https://www.radiall.com/ewscore/download/d/f/bWVkaWEvZG9jdW1lbnRfbGlicmFyeS9UZWNobm9sb2d5X2d1aWRlX1Jldl8yLjAucGRm/

Page 23 discusses hot switching and recommends 1w as a maximum

Sadly there is no information about Colin's relay to supplement Robin's information

 


Re: Radiall Relay Using Outside Spec

Dave G8KHU
 

Just had a browse on the Radiall website and found this:

https://www.radiall.com/ewscore/download/d/f/bWVkaWEvZG9jdW1lbnRfbGlicmFyeS9UZWNobm9sb2d5X2d1aWRlX1Jldl8yLjAucGRm/

Page 23 discusses hot switching and recommends 1w as a maximum

Sadly there is no information about Colin's relay to supplement Robin's information


Re: Radiall Relay Using Outside Spec

Colin Ranson
 

Thanks Robin !

 

Yo a star !

 

Not suitable for 3.4GHz but not a disappointment .... still very useable .

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: Robin Szemeti - G1YFG
Sent: 18 February 2021 15:07
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Radiall Relay Using Outside Spec

 

I use one of those on the output of my 23cm PA, non latching 28V,  2GHz

 

... the spec for them is 400W  or so i am told, I assume that is a "continuous duty" level ... it however has been used with 700W os 23cm SSB for a while now and no issues, although I do have an SMA isolation relay in addition in front of the preamp.

 

 

On Thu, 18 Feb 2021 at 14:57, Colin Ranson <g8lbs@...> wrote:

Afternoon all,

Whilst peoples attention is on here I have a couple of Radial relays, Ref 563703 – wonder if anybody has info please ?  These are transfer with 4 x N sockets, 26v and don’t think they are latching.

 

Regards and thanks

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: Robin Szemeti - G1YFG
Sent: 18 February 2021 14:51
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Radiall Relay Using Outside Spec

 

With good sequencing you would have to be very unlucky to switch it with a TX signal active.

 

 

On Thu, 18 Feb 2021 at 14:35, Dave G8KHU <david@...> wrote:

Hi Mark
and not wishing to teach granny to suck eggs but the 200W spec is the carry power, not the swiching power which from a hazy memory of a chat with Radiall many years ago was sub 1W.

73 Dave


--
Robin Szemeti - G1YFG

 


--
Robin Szemeti - G1YFG

 


Re: Ecoflex 15?

militaryoperator
 

Subject: Re: [UKMicrowaves] Ecoflex 15?

Ben – have a look here: LLA400UF® ULTRA FLEX Coaxial Cable - 1M INCREMENTS (ccsukltd.co.uk) It’s an ultra-flexible version of their own-branded clone of LMR400 and they sell in 1m increments. They also do custom cables Amateur (HAM) Radio Products (ccsukltd.co.uk).
Clive G3GJA


Thanks for info Clive. 

I guess for my 10ft run I'm probably worrying too much. The other option is to mount the SGLab trvrt and pa in a box just under the antenna, might save half a db or so, hi. 

cheers, Ben. 


Re: A proper RAE again

John E. Beech
 

Drop it to single exam 100 Q's 3 Hrs Maximum.

de John G8SEQ

-------Original Message-------
From: Glyn M0XGT <glyn.thomas512@gmail.com>
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] A proper RAE again
Sent: Feb 18 '21 15:07

The current exam structure looks like this:

Foundation: 26 questions, 1-hour, fee £27.50,
Intermediate: 46 questions, 1.5-hour, fee £32.50,
Full: 58 questions, 2-hour, fee £37.50,
[requirement for practical assessments currently suspended due to
Covid-19]

With the proposal to add:
Direct to Full: 130 questions, 4.5-hour, fee £73.00.

Comparing:
130 = 26 + 46 + 58.
4.5 hours = 1 + 1.5 + 2
£73 (save £24.50 on the total)

It looks equivalent to simply running the content of three exams in a
single session (the same numbers of questions in the same timeframe).
This seems reasonable, but 4.5 hr is possibly too long for a single
sitting.

Why not split it into smaller units with a break in between or taken
on different days? – which raises the question of why not just
introduce coordinated “sequential and adjacent” scheduling of the
Foundation, Intermediate, and Full as an option instead. This would
allow the award of Foundation and/or Intermediate if the criteria for
Full was not completely met, whereas the Direct to Full would "all or
nothing".

Glyn M0XGT


Re: Radiall Relay Using Outside Spec

Robin Szemeti - G1YFG
 

I use one of those on the output of my 23cm PA, non latching 28V,  2GHz

... the spec for them is 400W  or so i am told, I assume that is a "continuous duty" level ... it however has been used with 700W os 23cm SSB for a while now and no issues, although I do have an SMA isolation relay in addition in front of the preamp.

image.png


On Thu, 18 Feb 2021 at 14:57, Colin Ranson <g8lbs@...> wrote:

Afternoon all,

Whilst peoples attention is on here I have a couple of Radial relays, Ref 563703 – wonder if anybody has info please ?  These are transfer with 4 x N sockets, 26v and don’t think they are latching.

 

Regards and thanks

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: Robin Szemeti - G1YFG
Sent: 18 February 2021 14:51
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Radiall Relay Using Outside Spec

 

With good sequencing you would have to be very unlucky to switch it with a TX signal active.

 

 

On Thu, 18 Feb 2021 at 14:35, Dave G8KHU <david@...> wrote:

Hi Mark
and not wishing to teach granny to suck eggs but the 200W spec is the carry power, not the swiching power which from a hazy memory of a chat with Radiall many years ago was sub 1W.

73 Dave


--
Robin Szemeti - G1YFG

 


--
Robin Szemeti - G1YFG


Re: A proper RAE again

Glyn M0XGT
 

The current exam structure looks like this:
 
Foundation: 26 questions, 1-hour, fee £27.50,
Intermediate: 46 questions, 1.5-hour, fee £32.50,
Full: 58 questions, 2-hour, fee £37.50,
[requirement for practical assessments currently suspended due to Covid-19]
 
With the proposal to add:
Direct to Full: 130 questions, 4.5-hour, fee £73.00.
 
Comparing:
130 = 26 + 46 + 58.
4.5 hours = 1 + 1.5 + 2
£73 (save £24.50 on the total)   
 
It looks equivalent to simply running the content of three exams in a single session (the same numbers of questions in the same timeframe). This seems reasonable, but 4.5 hr is possibly too long for a single sitting. 
 
Why not split it into smaller units with a break in between or taken on different days? – which raises the question of why not just introduce coordinated “sequential and adjacent” scheduling of the Foundation, Intermediate, and Full as an option instead. This would allow the award of Foundation and/or Intermediate if the criteria for Full was not completely met, whereas the Direct to Full would "all or nothing". 
 
Glyn M0XGT 
 


Re: Radiall Relay Using Outside Spec

Colin Ranson
 

Afternoon all,

Whilst peoples attention is on here I have a couple of Radial relays, Ref 563703 – wonder if anybody has info please ?  These are transfer with 4 x N sockets, 26v and don’t think they are latching.

 

Regards and thanks

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: Robin Szemeti - G1YFG
Sent: 18 February 2021 14:51
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Radiall Relay Using Outside Spec

 

With good sequencing you would have to be very unlucky to switch it with a TX signal active.

 

 

On Thu, 18 Feb 2021 at 14:35, Dave G8KHU <david@...> wrote:

Hi Mark
and not wishing to teach granny to suck eggs but the 200W spec is the carry power, not the swiching power which from a hazy memory of a chat with Radiall many years ago was sub 1W.

73 Dave


--
Robin Szemeti - G1YFG

 


Re: Radiall Relay Using Outside Spec

Robin Szemeti - G1YFG
 

With good sequencing you would have to be very unlucky to switch it with a TX signal active.


On Thu, 18 Feb 2021 at 14:35, Dave G8KHU <david@...> wrote:
Hi Mark
and not wishing to teach granny to suck eggs but the 200W spec is the carry power, not the swiching power which from a hazy memory of a chat with Radiall many years ago was sub 1W.

73 Dave


--
Robin Szemeti - G1YFG


Re: Radiall Relay Using Outside Spec

Dave G8KHU
 

Hi Mark
and not wishing to teach granny to suck eggs but the 200W spec is the carry power, not the swiching power which from a hazy memory of a chat with Radiall many years ago was sub 1W.

73 Dave


Re: Matching LDMOS device

Clive, G3GJA
 

Thank you Greg, Geoff and Robin for your helpful replies.

 

The original device was a BLF6G15L-40BR, internally matched for use between 1450-1550MHz. Rated at 40W RF out it was designed for ultra-linear operation at 2.5W output with ACPR of -45dB. It even has an on-die sense FET that looks as though it was used to stabilize the bias, judging by the PCB tracks.

 

I presume the impedance I’m seeing on theVNA will be substantially modified by the matching for the original device; the substrate is very thin and the tracks wide so I’m guessing it’s very low Z, causing it to be a long way from the 1 ohm Greg suggests that the MRF184 might present at 1.3GHz. I’m not competent to work out the Er of the substrate from the matching of the original device from the track dimensions I can see and the known characteristics of the original device from its datasheet, but somebody with a lot more experience might be able to work it backwards.

 

Geoff, the Z I’m seeing is with the new MRF184 fitted. It doesn’t make much difference if it’s biased of not (Vds 28v, Ids 300mA)

 

The original device is only characterized at its intended frequency as here:

 

Table 9. Typical impedance per section

IDq = 330 mA; main transistor VDS = 28 V

 

F                          ZS                               ZL

(MHz)

1480                     3.2- j6.3                4.6- j4.5

1510                     4.4 -j6.5               4.6 - j4.5

 

I’ll have a look at Puff and Robin’s suggestion, SimSmith. It should be possible to run Puff on a guest VM running 32bit Windows in one of the Windows 10 machines.

 

Clive G3gja

 

 

 

 

 

 

From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of Greg - ZL3IX
Sent: 15 February 2021 19:44
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Matching LDMOS device

 

I'm not a PA specialist, but have designed one or two in the distant past. I believe that you need to use the impedance characteristics under drive at a typical power level, and these are not usually the same as would be the case under small signal conditions, ie when measured with a VNA. Making impedance measurements under drive is not a simple matter, and you may do well to take the manufacturer's data, here https://www.nxp.com/docs/en/data-sheet/MRF184.pdf.  Admittedly it only goes to 1 GHz, so you would need to attempt extrapolation up to 1.3 GHz. Even at 1 GHz the plot looks like around 1 ohm for Zin, which is way different from the 13 ohms you measured on your VNA.



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