Date   

Re: SMA / APC3.5 accessory part searching

John Quarmby
 


Re: SMA / APC3.5 accessory part searching

Dr. David Kirkby <drkirkby@...>
 

On 23 March 2014 07:00, "Pierre-François (f5bqp_pfm)"
<pfmonet@...> wrote:
Hi the Gang,

I'm searching for a manufacturer which build an accessory for sma and
APC3.5 nuts, to tork easily by hand the plug when you have to mount and
dismount it very often.
It's a sort of plastic wheel you place on the hexagonal nut of the plug.
It exists also in alumina however the one I'm interested in is the
plastic one not to scratch the nut.
Do you know who's manufacturing such a tool?
I need several of these to equip some noise sources.
If you are describing what I think you are, then Agilent use it on a
high end scope. You could ask on the Agilent forums, and hope someone
from Agilent will know where they source them from - I doubt they
would make them themselves.

I believe Huber and Suhner do some press-fit SMAs, so there is no need
for a torque wrench. They might be worth investigating too.

Dave


SMA / APC3.5 accessory part searching

Pierre-François (f5bqp_pfm)
 

Hi the Gang,

I'm searching for a manufacturer which build an accessory for sma and APC3.5 nuts, to tork easily by hand the plug when you have to mount and dismount it very often.
It's a sort of plastic wheel you place on the hexagonal nut of the plug.
It exists also in alumina however the one I'm interested in is the plastic one not to scratch the nut.
Do you know who's manufacturing such a tool?
I need several of these to equip some noise sources.

I would appreciate your help.

Also if you're EME fan don't forget to register you to the EME2014, it's located just across the Channel in Brittanny at Pleumeur Bodou.
www.eme2014.fr

Best 73's to all of you

--
Pierre-Francois, F5BQP


Re: Helical Filters

Andy G4JNT
 

Here's photo of the disassembled innards of one of the surplus 435MHz HRFs before chopping off turns.

The plastic supporting frame has slots every quarter turn to hold the hot end of the helix.


'jnt



On 22 March 2014 17:59, dave powis <g4hup@...> wrote:
 

I've also used a similar technique to lower the frequency range of Neosid helicals - by carefully butt soldering a length of silver plated wire of the same diameter as the original winding, and wound on the same radius.  Probably not to be recomended if the filter is liable to receive mechanical shock or vibration - but it worked.

73,
Dave


From: Andy Talbot <andy.g4jnt@...>
To: ukmicrowaves@...
Sent: Friday, March 21, 2014 12:41 PM
Subject: [ukmicrowaves] Helical Filters

 
Now that helps.
I have quite a surplus of two chamber 435 and 460MHz helicals thanks
to 'certain' modules that have proliferated at roundtables in the
past.
Found they're quite easy to open, provided you take out the tuning
slugs first, then gently prise the plastic holder out of the can in
each chamber.

The 435MHz one I played with had 8 turns, (tapped at 0.5 turns). Quick
bit of maths, 435 / 618 * 8 + 5.6 turns So initially chopped off
two turns reassembled and tested. The resulting new resonance was at
570 - 590MHz. Chopped off another 3/4 of a turn (now 5.25 turns
total, 4.75 above the tap), and teh filter can now be tuned to
618MHz. The shape isn't brilliant, but attenuation at the image
freqeuncy of 562MHz is 19dB, which is enough to minimise then image
noise contribution.
Chopping to 5.5 turns would have worked too.

Andy
G4JNT

>FWIW, it's not too difficult a procedure to raise the operating frequency of a particular helical filter by disassembly, snipping off a turn or a half or so, and then reversing >the disassembly procedure.

>I've successfully done this many times using TOKO or NEOSID helicals of different sizes and or frequency ranges, but I've only done this to through-hole mounting >types. OK, the SMD ones would be more of a challenge due to their small size, but it's worth investigating.

>--Doug Friend, VK4OE.




Re: Helical Filters

dave powis <g4hup@...>
 

I've also used a similar technique to lower the frequency range of Neosid helicals - by carefully butt soldering a length of silver plated wire of the same diameter as the original winding, and wound on the same radius.  Probably not to be recomended if the filter is liable to receive mechanical shock or vibration - but it worked.

73,
Dave


From: Andy Talbot To: ukmicrowaves@...
Sent: Friday, March 21, 2014 12:41 PM
Subject: [ukmicrowaves] Helical Filters

 
Now that helps.
I have quite a surplus of two chamber 435 and 460MHz helicals thanks
to 'certain' modules that have proliferated at roundtables in the
past.
Found they're quite easy to open, provided you take out the tuning
slugs first, then gently prise the plastic holder out of the can in
each chamber.

The 435MHz one I played with had 8 turns, (tapped at 0.5 turns). Quick
bit of maths, 435 / 618 * 8 + 5.6 turns So initially chopped off
two turns reassembled and tested. The resulting new resonance was at
570 - 590MHz. Chopped off another 3/4 of a turn (now 5.25 turns
total, 4.75 above the tap), and teh filter can now be tuned to
618MHz. The shape isn't brilliant, but attenuation at the image
freqeuncy of 562MHz is 19dB, which is enough to minimise then image
noise contribution.
Chopping to 5.5 turns would have worked too.

Andy
G4JNT

>FWIW, it's not too difficult a procedure to raise the operating frequency of a particular helical filter by disassembly, snipping off a turn or a half or so, and then reversing >the disassembly procedure.

>I've successfully done this many times using TOKO or NEOSID helicals of different sizes and or frequency ranges, but I've only done this to through-hole mounting >types. OK, the SMD ones would be more of a challenge due to their small size, but it's worth investigating.

>--Doug Friend, VK4OE.



Small scale QRP EME DXpedition to the Isle of Lewis (IO68)

g4bao
 

Please pass this around the EME community.
 
April 26th-May 3rd 2014 the Camb-Hams traditional Scottish Island activation will be underway. We're headed to the top of the Isle of Lewis in the Scottish Outer Hebrides (IOTA EU-010). The location is The Decca, IO68UL. Callsign GS3PYE/P

While this is mainly an HF-VHF expedition (160 -> 4m), I'm continuing to educate the gang in the joys of "Achievable Moonbounce". And by this I mean EME that doesn't involve using a dish the size of Jodrell bank or a Yagi array the size of an apartment block. 

To that end GS3PYE/P are planning to take 400Watts and a 17 ele on 144MHz and 150W to a single 55element Yagi on 1296MHz. As you can work out by the system parameters,  it'll focus on JT65c, but we'll be more than happy to reply on CW if we hear you. Look out for us on HB9Q and the 144MHz JT-EME chat, and work this very rare VHF/SHF square and IOTA. I plan to be testing the 1296 system from home in the weeks leading up to the trip so please call me if you see me on HB9Q.

73
John         


Re: Can't 'Reply To' group messages

Mike Willis
 

So the problem must be at Andy's end - I got it too.

Mike


Re: Can't 'Reply To' group messages

Michael Scott
 


It came through to me OK
 
Mike

----- Original Message -----
Sent: Friday, March 21, 2014 6:46 PM
Subject: [ukmicrowaves] Re: Can't 'Reply To' group messages

 

I can't reply either....unless you can read this.

Mike


Can't 'Reply To' group messages

Andy G4JNT
 

I think its a GMail thing. (Referring to Mike's post). I see you're
GMail as well
Apart from Groups, I also can't reply to EMails that are being
forwarded from my BTInternet account.

Andy
'jnt


Re: Can't 'Reply To' group messages

Mike Willis
 

I can't reply either....unless you can read this.

Mike


Can't 'Reply To' group messages

Andy G4JNT
 

As of this morning, trying to "Reply To" emails from any Yahoo Group
results in a Webpage Not Found message.

Is this just me or have others found this problem too?

I was a fan of Yahoo Groups, but am beginning to become less than
impressed now.
Yesterday I couldn't get onto the Yahoo Groups pages at all, the PC
locked up and I had to close down IE completely, or wait an
inordinately long time for the error situation to time out. Haven't
tried yet today.

Andy
G4JNT


Helical Filters

Andy G4JNT
 

Now that helps.
I have quite a surplus of two chamber 435 and 460MHz helicals thanks
to 'certain' modules that have proliferated at roundtables in the
past.
Found they're quite easy to open, provided you take out the tuning
slugs first, then gently prise the plastic holder out of the can in
each chamber.

The 435MHz one I played with had 8 turns, (tapped at 0.5 turns). Quick
bit of maths, 435 / 618 * 8 + 5.6 turns So initially chopped off
two turns reassembled and tested. The resulting new resonance was at
570 - 590MHz. Chopped off another 3/4 of a turn (now 5.25 turns
total, 4.75 above the tap), and teh filter can now be tuned to
618MHz. The shape isn't brilliant, but attenuation at the image
freqeuncy of 562MHz is 19dB, which is enough to minimise then image
noise contribution.
Chopping to 5.5 turns would have worked too.

Andy
G4JNT

FWIW, it's not too difficult a procedure to raise the operating frequency of a particular helical filter by disassembly, snipping off a turn or a half or so, and then reversing >the disassembly procedure.
I've successfully done this many times using TOKO or NEOSID helicals of different sizes and or frequency ranges, but I've only done this to through-hole mounting >types. OK, the SMD ones would be more of a challenge due to their small size, but it's worth investigating.
--Doug Friend, VK4OE.


Helicals

Alan Melia
 

Hi all I just sent a personal response to Andy but then realised other might be interested to

Barendt Hendrikson have a lot of Toko helicals on their web site including the 600 odd MHz one Andy wants. i have used them before for difficult to get parts ......they can be expensive but that is what one mucy expect for "unobtainium" :-((

I have an order due in to Eisch so if anyone wants odd parts....maybe collect at MHRT let me know within the next 3 days I can add them to the order to save you postage.

Alan
G3NYK


Re: Helical Filters

DougF VK4OE
 

Greetings Andy and other readers.

FWIW, it's not too difficult a procedure to raise the operating frequency of a particular helical filter by disassembly, snipping off a turn or a half or so, and then reversing the disassembly procedure.

I've successfully done this many times using TOKO or NEOSID helicals of different sizes and or frequency ranges, but I've only done this to through-hole mounting types.  OK, the SMD ones would be more of a challenge due to their small size, but it's worth investigating.

And otherwise-unwanted filters recovered from surplus bits of gear can be used to meet a need - like the 'odd' frequency that you are aiming for.

Very best wishes,

--Doug Friend, VK4OE.


On 21/03/2014 6:43 AM, Andy Talbot wrote:
 
Tnx Mike
but Murphy's law comes into play here
 
They specifically do ones for the Ham Bands,  or  "open frequencies".  Great for transverters and nornal H.Brewing perhaps,
 
But I need one for 620MHz
Need to delve further into their website, they do appear to have "Toko compatible" designs...
 
'jnt


Re: Helical Filters

Gerard Geesink <pa0batster@...>
 

Neosid?

Op 20 mrt. 2014 15:29 schreef "Andy Talbot" <andy.g4jnt@...>:

 

Does anyone know another source of Toko, or similar, helical filters?
I need a 610 - 640MHz off-the-shelf unit that is readily available.
Ideally SMT, but through hole will do if that's all they have

The BEC (Bonex) website, lists a wide range of UHF helicals them in
their catalogue, but clicking on the part number just goes to a blank
form. So I suspect its no longer carried. Failing that, looks like
it'll have to be a printed line a-la DDK001 .

(and what's it for, think 618MHz)

Andy
G4JNT


Re: Helical Filters

geoffrey pike
 

The Eisch-Kafta-Electronic GmbH catalogue has the Toko 5HW 367 MN 101A listed 650 MHz
May tune in the needed direction, indeed Helicals are an issue these days would almost drive you to make them.
Geoff
--------------------------------------------

On Thu, 20/3/14, Andy Talbot <andy.g4jnt@...> wrote:

Subject: Re: [ukmicrowaves] Helical Filters
To: ukmicrowaves@...
Date: Thursday, 20 March, 2014, 20:43


 









Tnx Mike
but Murphy's law comes into play here
 
They specifically do ones for the Ham Bands,  or 
"open frequencies".  Great for transverters and
nornal H.Brewing perhaps,
 
But I need one for 620MHz
Need to delve further into their website, they do
appear to have "Toko compatible" designs...
 
 
 
'jnt


 
On 20 March 2014 15:46,
Michael Scott <g3lyp@...>
wrote:


 




Hi Andy
 
There is a company in Taiwan called
Temwell  www.temwell.co.tw which
make a range of Toko equivalwnt helical filters, but I
don't know how easy they are to deal with as amateurs,
but you could try them.

 
73, Mike, G3LYP



----- Original Message -----

From: Andy Talbot

To: ukmicrowaves@...

Sent: Thursday, March
20, 2014 2:29 PM
Subject: [ukmicrowaves]
Helical Filters

 

Does anyone know another source of Toko, or similar,
helical filters?
I need a 610 - 640MHz
off-the-shelf unit that is readily available.
Ideally SMT, but through hole will do if
that's all they have


The BEC (Bonex) website, lists a wide range of UHF helicals
them in
their catalogue, but clicking on the
part number just goes to a blank
form. So I
suspect its no longer carried. Failing that, looks like
it'll have to be a printed line a-la DDK001
.


(and what's it for, think 618MHz)

Andy
G4JNT














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Re: Helical Filters

Andy G4JNT
 

Tnx Mike
but Murphy's law comes into play here
 
They specifically do ones for the Ham Bands,  or  "open frequencies".  Great for transverters and nornal H.Brewing perhaps,
 
But I need one for 620MHz
Need to delve further into their website, they do appear to have "Toko compatible" designs...
 
 
 
'jnt


 

On 20 March 2014 15:46, Michael Scott <g3lyp@...> wrote:
 

Hi Andy
 
There is a company in Taiwan called Temwell  www.temwell.co.tw which make a range of Toko equivalwnt helical filters, but I don't know how easy they are to deal with as amateurs, but you could try them.
 
73, Mike, G3LYP
----- Original Message -----
Sent: Thursday, March 20, 2014 2:29 PM
Subject: [ukmicrowaves] Helical Filters

 

Does anyone know another source of Toko, or similar, helical filters?
I need a 610 - 640MHz off-the-shelf unit that is readily available.
Ideally SMT, but through hole will do if that's all they have

The BEC (Bonex) website, lists a wide range of UHF helicals them in
their catalogue, but clicking on the part number just goes to a blank
form. So I suspect its no longer carried. Failing that, looks like
it'll have to be a printed line a-la DDK001 .

(and what's it for, think 618MHz)

Andy
G4JNT



Helical filters

Michael Scott
 

Hi Andy
 
The url should be .com.tw, not .co.tw, sorry!
 
Mike


Re: Helical Filters

Michael Scott
 

Hi Andy
 
There is a company in Taiwan called Temwell  www.temwell.co.tw which make a range of Toko equivalwnt helical filters, but I don't know how easy they are to deal with as amateurs, but you could try them.
 
73, Mike, G3LYP

----- Original Message -----
Sent: Thursday, March 20, 2014 2:29 PM
Subject: [ukmicrowaves] Helical Filters

 

Does anyone know another source of Toko, or similar, helical filters?
I need a 610 - 640MHz off-the-shelf unit that is readily available.
Ideally SMT, but through hole will do if that's all they have

The BEC (Bonex) website, lists a wide range of UHF helicals them in
their catalogue, but clicking on the part number just goes to a blank
form. So I suspect its no longer carried. Failing that, looks like
it'll have to be a printed line a-la DDK001 .

(and what's it for, think 618MHz)

Andy
G4JNT


Helical Filters

Andy G4JNT
 

Does anyone know another source of Toko, or similar, helical filters?
I need a 610 - 640MHz off-the-shelf unit that is readily available.
Ideally SMT, but through hole will do if that's all they have

The BEC (Bonex) website, lists a wide range of UHF helicals them in
their catalogue, but clicking on the part number just goes to a blank
form. So I suspect its no longer carried. Failing that, looks like
it'll have to be a printed line a-la DDK001 .

(and what's it for, think 618MHz)

Andy
G4JNT