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Cross Country Wireless...changes in selling to the EU

Chris Moulding
 

On 1st July new regulations come in affecting how tax is collected when selling to the EU countries from outside the EU.

At first I thought that it would be OK to send items to the EU without tax and have the customer pay the tax on collection.

Over recent days I've had an interesting series of emails from customers letting me know that in addition to the tax there is also a collection or handling fee around 15 €.

This makes buying low value items from outside the EU very expensive.

I've been looking at various alternatives to help our EU customers avoid paying handling fees.

Other than move to the EU / have a stock in the EU / appoint a distributor, the solutions involve lots of paperwork suitable for a large business or involve paying additional fees to agents or middlemen that come close to the handing charge especially as 27 individual tax regimes and tax rates are involved.

The solution I have found is to sell to our EU customers using eBay. They have a scheme where they apply the correct tax for the customer's country and when a sale is made send the tax to the relevant tax authority. We get paid the price less tax and the item can be shipped to the EU without any extra tax or handling charges paid by the customer.

Over the next week or so I'll make eBay listings for our products and place a link on the product web page.

It's still possible for EU customers to buy direct if they don't like eBay but bear in mind that you will be charged tax and a handling charge when it reaches your country.

Regards,

Chris

Regards,

Chris


Re: Re-purposing older CCW amplifier

David Cutter
 

Understood, perhaps I could bend the elements  45• towards each other?

David

On 29 June 2021 at 17:48 Chris Moulding <chrism@...> wrote:

You won't be able to reposition the antenna mounts on the early versions of the HF Active Antenna.

When they were built we used a dab of the highest grade of Loctite to lock the antenna mounts.

It seemed a good idea at the time until I came to repair one.

It is impossible to undo the M6 bolt holding the antenna mount to the box. Believe me I tried!

On later ones we used a medium grade of Loctite which can be undone.

Regards,

Chris


Re: Re-purposing older CCW amplifier

Chris Moulding
 

You won't be able to reposition the antenna mounts on the early versions of the HF Active Antenna.

When they were built we used a dab of the highest grade of Loctite to lock the antenna mounts.

It seemed a good idea at the time until I came to repair one.

It is impossible to undo the M6 bolt holding the antenna mount to the box. Believe me I tried!

On later ones we used a medium grade of Loctite which can be undone.

Regards,

Chris


Re: Re-purposing older CCW amplifier

David Cutter
 

Thanks, Chris that sounds like an interesting approach: I could re-position one of the element holders onto an adjacent side of the box and use the original elements. 

It doesn't give me the noise properties of a loop, so, I'll be ordering the LAA for that.  I think the bicycle rim is a great idea. 

73 David G3UNA


On 29 June 2021 at 11:26 Chris Moulding <chrism@...> wrote:

Hi David,

The HF Active Antenna was designed as a very high impedance balanced amplifier to work with a short dipole.

The bicycle wheel loop needs a low impedance amplifier such as the Loop Antenna Amplifier.

One way to reuse one of the HF Active Amplifiers is to make a Vee antenna with the elements at 90 degrees rather than 180 degrees. This makes an omni-directional antenna with elliptical polarisation that can hear ground wave, NVIS and sky wave signals equally well with reduced fading.

The web page showing that antenna is here: http://www.crosscountrywireless.net/active_vee_antenna.htm

By the way I'm planning soon to release an amplifier for a Vee antenna so that users can source the whips locally to keep the shipping cost down.

Regards,

Chris


Re: Re-purposing older CCW amplifier

Chris Moulding
 

Hi David,

The HF Active Antenna was designed as a very high impedance balanced amplifier to work with a short dipole.

The bicycle wheel loop needs a low impedance amplifier such as the Loop Antenna Amplifier.

One way to reuse one of the HF Active Amplifiers is to make a Vee antenna with the elements at 90 degrees rather than 180 degrees. This makes an omni-directional antenna with elliptical polarisation that can hear ground wave, NVIS and sky wave signals equally well with reduced fading.

The web page showing that antenna is here: http://www.crosscountrywireless.net/active_vee_antenna.htm

By the way I'm planning soon to release an amplifier for a Vee antenna so that users can source the whips locally to keep the shipping cost down.

Regards,

Chris


Re-purposing older CCW amplifier

David Cutter
 

Hi Chris
Is there a way to re-purpose the old Sentinel aerial to your bicycle rim idea? 
was this:  http://www.crosscountrywireless.net/hf_active_antenna.html


73 David G3UNA


Re: Flag antenna,loop pre amplifier

PAUL LANGFORD
 

hi Chris thanks for the email.if I got one of your loop amplifier can I get a null off the back with a resistor on the top?
regards

------ Original Message ------
On Sunday, 27 Jun, 21 At 19:55, Chris Moulding<chrism@...> wrote:

Hi Paul,

If you order the Beverage Antenna Amplifier send me an email or note to remind me that you want it to match into a 900 ohm load.

Regards,

Chris


Re: Flag antenna,loop pre amplifier

Chris Moulding
 

Hi Paul,

If you order the Beverage Antenna Amplifier send me an email or note to remind me that you want it to match into a 900 ohm load.

Regards,

Chris


Re: Flag antenna,loop pre amplifier

PAUL LANGFORD
 

Hi Chris,the resistor Is 900 ohm to get the null off the back.so the beverage box would be the best then?
regards

------ Original Message ------
On Sunday, 27 Jun, 21 At 12:31, Chris Moulding<chrism@...> wrote:

Hi Paul,

The choice of amplifier depends on the termination resistor of your flag antenna.

For low values up to 100 ohms then the Loop Antenna Amplifier can work well without much added loss.

For higher values then the Beverage Antenna Amplifier will be a better match as it's designed to match the typical 450 ohm load of a Beverage antenna.

If the termination resistor is out of this range I could change the windings on the input transformer to match that impedance. For example the Beverage Antenna Amplifier is effectively the Loop Antenna Amplifier with a different input transformer.

Regards,

Chris


New distributor for the Loop Antenna Amplifier

Chris Moulding
 

I'm pleased to announce that SDR-Kits are now distributors for the Loop Antenna Amplifier.

This adds to the range of SDR receivers, test equipment and components on their web site.

They will also sell the amplifier through their distributors worldwide so may be available at local dealers as a lower cost option to being shipped from the UK.

The page for the Loop Antenna Amplifier on the SDR-Kits web site is:

https://www.sdr-kits.net/Loop-Antenna-Head-with-12-DC-Bias-Tee

The SDR-Kits web page is:

https://www.sdr-kits.net/

Regards,

Chris


Re: Flag antenna,loop pre amplifier

Chris Moulding
 

Hi Paul,

The choice of amplifier depends on the termination resistor of your flag antenna.

For low values up to 100 ohms then the Loop Antenna Amplifier can work well without much added loss.

For higher values then the Beverage Antenna Amplifier will be a better match as it's designed to match the typical 450 ohm load of a Beverage antenna.

If the termination resistor is out of this range I could change the windings on the input transformer to match that impedance. For example the Beverage Antenna Amplifier is effectively the Loop Antenna Amplifier with a different input transformer.

Regards,

Chris


Flag antenna,loop pre amplifier

PAUL LANGFORD
 

Hi,I'm looking for some help.i have a mw terminated flag antenna can I use the CCW loop amplifier on it?
Regards


Re: lOOP cONSTRUCTION

Martin - G8JNJ
 

On Mon, Jun 14, 2021 at 07:52 PM, Chris Moulding wrote:
I think it may be a bit harsh to describe them as snake oil. More a case of enthusiasts looking for something better than a simple loop without thinking it through.
I'd agree, many of the more complicated loop designs are actually worse performers, and the novelty value exploited as a sales feature to help make them stand out from the rest of the crowd.

e.g. More metal must be better :-)

https://www.g8jnj.net/moebius-loop-antenna

Regards,

Martin


Multicoupler and Broadband Active Antenna both with bias tee compatibility

Scott
 

Hi Chris

Do you have any update on when the Multicoupler and Broadband Active Antenna both with bias tee compatibility will be available?

Thanks


Re: lOOP cONSTRUCTION

David Cutter
 

I'm guessing a bit that amateurs copied ship-board DF loops and the Bellini-Tosi variety all made to reject the ship's magnetic field, thinking this was the way to do it.  W8JI wrote a bit about it and rejected the idea for amateur situations, so, you are in good company, Chris. I still like your bicycle wheel loop, it does it all. 

David G3UNA

On 14 June 2021 at 19:39 Chris Moulding <chrism@...> wrote:

Hi Chris,

After a lot more testing of the shielded loop and Mobius loop designs it became clear that they gave no improvement in noise rejection over an unshielded loop.

The design of the Loop Antenna Amplifier in the later "+" and "++" versions gives a tightly balanced loop input that helps reject common mode reception from the loop element. The early HF/VHF version also had a similar input design.

In all versions of the Loop Antenna Amplifier there is a common mode filter on the coax output to reject common mode noise coming up the feeder to the loop element.

I suspect that it was the common mode noise coming up the feeder that made the shielded and Mobius designs appear to have lower noise in amplifiers that didn't have good common mode rejection.

It's far better to stop the noise before it can reach the loop antenna element.

Regards,

Chris


Re: lOOP cONSTRUCTION

Chris Elmquist
 

Yes. Thanks Chris. I have studied your cardioid write-up as well and that looks encouraging. I can use with a rotor so that would give me ability to point where I need it (or opposite of where I don't need it!)

Will pursue. Thanks again, 73 Chris N0JCF


Re: New version of Receiver Protection Unit

Roger Need
 

The factor not often mentioned in the specs for receiver protection boxes is the OIP2 and OIP3.  In order to do the limiting they all contain some type of non-linear limiting device (diode, saturating transformer etc.) and these generate unwanted spurious signals.  This happens at signal levels well below the maximum output limit spec of 10 to 20 dBm.

The OIP2 and OIP3 two carrier tests will give an indication of what to expect when you use one of these protection devices.  Perhaps Chris will let us know what he measures on his unit.


Roger


Re: lOOP cONSTRUCTION

Simon
 

Hi Chris

Ok point taken.. but I put money on a good simple loop will be as good as anything as long as it has a good preamp like yours or wellbrock etc.

I tried sooo many..in the end cardioid’s where for me here in high qrm land..

Simon


Re: lOOP cONSTRUCTION

Chris Moulding
 

The problem with a lot of "improved" loop designs like the shielded and Mobius designs is that they don't work as you would expect at first glance.

The "shielded" loop actually works as two halves of a short dipole transformer coupled to the inner wire.

The Mobius design is similar. It's original purpose was to protect an RF measuring instrument from the EMP spike of a nearby nuclear explosion. It is similar in operation to the shielded loop.

I think it may be a bit harsh to describe them as snake oil. More a case of enthusiasts looking for something better than a simple loop without thinking it through.

Chris, if you want to try a different design try the cardioid loop designs on this web page:

http://www.crosscountrywireless.net/cardioid_loop_antenna.htm

Rather than having two sharp nulls the cardioid loop has a wide (120 degree) null off the back. If you can mount it so that it faces the area you want to cover and null noise off the back then it works really well.

Regards,

Chris


Re: lOOP cONSTRUCTION

Simon
 

Hi all

I would agree with Chris here..
I have tried all.. no difference at all. So just use a good non shielded loop..

Snake oil comes to mind..

Simon

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