+1 for audioquest cinnamon

Can you show a pic of how you do the choke on the cable ?

This is taken from the Cisco switch installation manual

If the choke is slightly big, then adding a small piece of Blu-Tack will prevent it from slipping down the wire. The choke seems to work best when kept close to the connector.

Also, to avoid straining the connection to my network player, I've inserted a small piece of soft foam (between the wire and my shelf) to support the added weight of the choke.

ATB.

Hook

Hi ya Hook,  I heard you've got the winter back again  !!!  My Lakeville buddy was cursing as he got his boat out early on the promise of the previous weeks warmth.       

Another tip for all the ferrite fans out there ...........

Your property telephone supply cable is an antenna that can pick up all sorts of noise; better if its underground, but bad if its an air route. 

My tip is to add a ferrite to the RJ11 cable just before it enters the router. 

1 turn around a split core is the usual recommendation, however I have 4 turns; maybe too many but it for sure doesn't seem to cause problems. When I installed it the line speed seemed to improve (something hard to prove one way or another).  Whatever its something that will do no harm but might do something helpful.  

Interesting tip Mike-B, thanks.

I have some ferrite cores on order to try just out of curiosity for the minimal outlay.

Ill add your tip in to my tests to see if ferrite will do anything for my set up.

I've been toying with the idea of trying some ferrite cores myself, any chance that anyone who bought some will put up a link to the website? Worried that breaks any forum rules my email address is in my profile. 

Simon, you mentioned using them on a Powerline as well if memory serves me correctly, do you use them on all cabling?

SJB

I just bought mine from the local Radio Shack.

SJB, if you do a search for Ferrite Chokes in the Search section of the forum there is a wealth of posts running over the last few years - I hadn't realised actually how many times this has come into the conversations!

Simon has indeed been busy helping us all with advice on this issue for quite a while 

I got mine from the large mail order company named after a South American rainforest, but there seems to be quite a few options.

6mm was mentioned in previous posts for Ethernet cables btw.

SJB,  best bet is to do an interweb search, you will find RS, Farnell-CPC, Mouser etc, & a plethora of others, the rain forest & fleabane comes up a lot & I find their combined vendor lists very useful.  A few vendors are based in your part of the world.   

Wrapping a few turns of RJ11 onto a core is one thing,  but with a single round cable like RJ45 (ethernet) its best to have a well fitting ferrite.  It takes a bit of searching to find a split core that is the right size for your specific cable(s).  Using the combined vendor lists to get exactly the right size is helpful. OK a loose ferrite core can be packed out with insulating tape or bluetak,  but its better to get the right size in the first place.

Hi Sloop, no not used them on a Powerline. I use on DC1 and Ethernet leads.

Simon

OK the ferrite on the  telephone cable is at the router end, or I guess Infinity modem in my case?

Where would one fit the cores on the other cables? 

Hi BigH

Fitting a ferrite on the RJ11 phone cable into the modem would be OK whatever type of supply you are on, but would be less effective if you have Infinity.  RFI noise is only picked up on the cable section from your house wiring to wherever the Infinity J-box & the optical feed section starts.  In my case we cannot get Infinity for the forseeable future & my jurrasic cables run across 20m of fresh air from house to pole & the underground section back to the exchange.

With ethernet cables the various installation books from the likes of Cisco show only one installed on each cable. So I would put one on each of the cables close to the player & the NAS.

When I was installing & servicing marine radio/radar/DF we had ferrites on both ends of everything. More often these were multi-cable clamps to fix cables to the trucking & made of a heavy cast ferrous if not ferrite.   So as far as I am concerned, that’s good enough for my home set up & I have a ferrite on both ends of my NAS-Router(Switch) & Router-Player Ethernet cables,  i.e. the main circuit route from NAS to player.     

Thanks Mike.

One near the NAS is fine, but not sure what is my player? the iMac I assume?

NAS (iTunes music data) - 8 way Netgear router. 

On the 8 switch is the printer, Time Capsule,iMac,BT HH4 and a  lead to another 4 way switch  at the other end of the room for  BRP, DVDR, Sky+ box and TV.

Any point in ferrites on any of these or just the music ones?

Hi H,  it will help on them all. 

If you want to limit them - 1 on the line from 8 way to 4 way would be good as that isolates the AV section. Then 1 on each of iMac, HH4 & the NAS.

Thanks again Mike, I'll order a few and experiment.

BigH47, from my experience if you, can try and ensure the choke  is most effective around the 30MHz mark. Quality choke manufacturers usually have a reactance chart, and check the choke is effective around 30MHz on the chart... Ie it has a high reactance.

some chokes may be optimum for higher frequencies to assist EMI compliance, but these won't be as effective IMO of reducing intermodulation distortion through RFI on our audio equipment.

Simon

BigH,  to Simon’s point,  its tough finding the ideal spec ferrite material even for someone who is familiar with this kind of thing. UK & Europe is not so well served as are USA & one maker in particular Fair-rite serves the US market well. Problem is they are not so widespread –at least all the various material types are not around Europe.  Then the other manufacturers all use different material code numbers & it sure gets confusing.  

I have TDK clamps with their code 30 material on my Ethernet; the TDK blurb  says they are broadly designed to cover the aplication we are working with.  Rated at 50 ohms between 10-100MHz & looking at the graphic it is quite flat in ferrite terms & IMO is good for what I am trying to do up to the 100MHz point that the Naim units run up to.     

Just pop down to Maplin and buy a one of the clamp types to suit the cable diameter - for the application they are being used for (and at this point the effect they give is more icing on the cake rather than a box upgrade) it's really not worth spending too much time worrying about the ideal spec. 

100% James - its icing on the cake,  but I do prefer iced cake than plain,  & I'm not sure what no fitted ferrites will do to the replay, but I'm not bothering to find out

My post was trying to put some info into Simon's post

The TDK clamps I use are easy to get on e-bwww, they deliver in about 2 days so hardly worth going on a shopping trip - Maplins selection is very basic & limited these days BTW. 

Meanwhile I'm in the middle of figuring out UPnP, playing with iPads & understanding fully how the Synology works with NDX  

-  did I mention ....  NDX  est arrive    

Tres bien!

La jour de gloire!

I should be saying I will post a first listen report TOMORROW

But as it happens we are out all day visiting. I should say "damn it" but its a special day as all the offspring part of Mr+Mrs-B family are getting together for the first time since the announcement of our daughters first pregnancy.    

But wrt NDX = so far so very good

I now sort of know my way around the UPnP & iPAD stuff

Now we both must settle down for a serious listen.

Actually Maplin appear to do three models of clamp. Two of the three should be quite effective with the HEM3018 type being probably the most effective for our application.

Simon