Re: LF: interfacing tips for audio amps courtesy John and Jay in the US - 472/137

[Mal Hamilton <g3kevmal@talktalk.net>]

Jim

Do u have Decca 5501 units if so they work well on MF

I can supply details to resonate on MF and interface to ts590 or ic706

73 Mal

G3KEV

On 1 Oct 2016, at 20:10, James Cowburn <jim.cowburn@outlook.com> wrote:

Hi all

 

John sent me over this sketch of how best to interface my 706 to a Hafler audio amp as well as some schematics from their excellent website on the subject

 

http://www.w1vd.com/page21.html

 

http://www.w1tag.com/pix/Hafler_Amp.jpg

 

http://www.w1vd.com/Haflertransformers.html

 

I have a 3000, though John informs me that these don't play nice on 472.

 

I've got the coax and the -77 material cores and caps so it's time to get building.

 

I'm on the lookout for a 9505 but most on Ebay  are outside my budget and also US spec and need 110V, though I could always get a converter.

 

If the weather stays dry, then I'm hoping to crack on with this, this week and get G7NKS to be a bit more QRO and hopefully crack the T/A and 2000km barriers on WSPR 472.

 

That'll be the broadband gone then!   Stefan helpfully sent me over some ideas to look for how to proof the router against interference, but it may well just be a cheapo BT Homehub 4 and it’s internal aerials.

 

Enjoy the darker months guys and hope to see you all on MF and LF

 

 

 

With best regards

 

 

Jim

 

 

Dr. Jim Cowburn  G7NKS IO92ub

 

 

<Halfer interfacing with 706 courtesy John in US.pdf>

<Haflertransformers.pdf>