Re: LF: VU2BGS

[Gaj Kumar <bsgkumar@gmail.com>]

Thanks Jacek

Yes The Flybacks are a rare comodity .

 I have a few left from Tesla coil experiments .

The PC power supplies we have in plenty and will look for the 500W > type of cores 

a few months back i was talking about the toroids and ferrites  to some old school mates ,

after a month he gave me a bag full about 20kgs of lovely ceramic toroids about 1-inch dia 

used in the water tap . I had to hold my laughter and thank him for the kind gift .

There was a manufscturer of Tap washers who makes these Ceramic washers ! close ot his work area 

who gave him a bag full of these as they had small nicks and chips 

Yes they are working well as VHF formers !!

may be useful for high voltage insulation etc .

have a great day 

73 

Kumar

On Thu, Dec 27, 2018 at 4:05 AM Jacek Lipkowski <sq5bpf@lipkowski.org> wrote:

iI forgot, old TV flyback transformers are also useful as a source of
ferrite for power applications.

Also the HV windings on these transformers (at least from TVs made in
Poland) have 1-1.5H inductance. This gives a nice resonance at 8kHz with a
40m longwire. Useful for receiving VLF (i've received one of Stefan's
first transmissions using this antenna), and also for transmitting (i can
receive my signal in QRSS60 at 1.2km) from my antenna.

You can also use the transformers from old PC power supplies. They work
well at 136 and 472kHz.

I'm sure you will find other sources of ferrite when you look around.
There is plenty of junk that can be recycled into useful amateur radio
components. Not everything has to be bought at Mouser.

VY 73

Jacek / SQ5BPF


On Wed, 26 Dec 2018, Jacek Lipkowski wrote:

> Date: Wed, 26 Dec 2018 23:11:11 +0100 (CET)
> From: Jacek Lipkowski <sq5bpf@lipkowski.org>
> Reply-To: rsgb_lf_group@blacksheep.org
> To: rsgb_lf_group@blacksheep.org
> Subject: Re: LF: VU2BGS
>
> Instead of ferrite rods from AM radios, search for "impeder" rods. These are
> used for induction welding of pipes, and can stand high power at hundreds of
> kHz. Sometimes you can get them cheap on auction sites.
>
> I use one to match my 40m longwire antenna on 630m. When tested on the bench
> it survives 100W without problems. It also makes a nice receive antenna (few
> of then can be stacked in a long tube).
>
> VY 73
>
> Jacek / SQ5BPF
>
>
> On Wed, 26 Dec 2018, DK7FC wrote:
>
>> Date: Wed, 26 Dec 2018 19:42:05 +0100
>> From: DK7FC <selberdenken@posteo.de>
>> Reply-To: rsgb_lf_group@blacksheep.org
>> To: rsgb_lf_group@blacksheep.org
>> Subject: Re: LF: VU2BGS
>>
>> ...I know someone who clandestinely removed the ferrite rod of a radio of
>> his XYL (now ex XYL) beeing able to receive the MF AM
>> broadcast. Many radios, if not to modern offer 'FM/AM' radio but AM is not
>> used by most people. So this rod can be used to build a
>> matching unit for a 630m band antenna. And of course the core material is
>> suitable because the antenna is used for this frequency
>> range.
>> However one has to take care that no local QRM sources are picked up with a
>> rod. This is the disadvantage relative to a toroid of
>> course. So better place the core near the antenna, not into the shack.
>>
>> 73, Stefan
>>
>> Am 26.12.2018 17:03, schrieb Clemens Paul:
>>
>>       Hi Kumar,
>>
>>        >only the ferrites are a big problems here !
>>
>>       You may have a look at
>>       https://www.radio-store.co.uk/
>>
>>       They ship worldwidwe,sell also small quantities and have very
>> competitive prices.
>>
>>       73
>>       Clemens
>>       DL4RAJ
>>        
>>
>>       >-----Original Message-----
>>       >From: owner-rsgb_lf_group@blacksheep.org
>>       >[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Gaj Kumar
>>       >Sent: Wednesday, December 26, 2018 9:40 AM
>>       >To: rsgb_lf_group@blacksheep.org
>>       >Subject: Re: LF: VU2BGS
>>
>>
>