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Sci.Electronics.Basics -> Fitting co-ax aerial socket to DAB radio that doesn't have one
There are 3 messages in this thread.
You are currently looking at messages 1 to 3.
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Author: TyroDate: 13:33 06-12-06
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I recently bought a Sony CMT-SPZ90DAB mini hi-fi with a DAB radio. The
aerial provided is a 2m length of wire connected to one female pin of a
a small plastic 3 pin plug which fits into a 3 male pin socket. There
is no other aerial connection. Reception in my area is very poor and I
have lost most of my favourite FM stations, and can receive only 6 DAB
frequencies.
I have a roof top mounted FM Yagi with 50 ohm co-ax and an internal
"slim jim" DAB aerial with 75 ohm co-ax and no way of connecting either
to the radio. Connecting to the single pin or the aerial wire, and
earthing the braid to casing doesn't work.
A Google search provided the following from a 2001 post to this group
"If you *must* go tampering inside this crap radio, connect the coax
inner via a small (100pf?) capacitor to wherever the dangly wire goes,
and the outer by another capacitor to the largest lump of copper you
can
find on the PCB."
Can anyone confirm that this is correct or have any other suggestions?
I know little about radio electronics and would appreciate help from
one of you knowledgable boffins out there.
Here's hoping.
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Author: terryDate: 19:18 06-12-06
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Tyro wrote:
> I recently bought a Sony CMT-SPZ90DAB mini hi-fi with a DAB radio. The
> aerial provided is a 2m length of wire connected to one female pin of a
> a small plastic 3 pin plug which fits into a 3 male pin socket. There
> is no other aerial connection. Reception in my area is very poor and I
> have lost most of my favourite FM stations, and can receive only 6 DAB
> frequencies.
>
> I have a roof top mounted FM Yagi with 50 ohm co-ax and an internal
> "slim jim" DAB aerial with 75 ohm co-ax and no way of connecting either
> to the radio. Connecting to the single pin or the aerial wire, and
> earthing the braid to casing doesn't work.
>
> A Google search provided the following from a 2001 post to this group
>
> "If you *must* go tampering inside this crap radio, connect the coax
> inner via a small (100pf?) capacitor to wherever the dangly wire goes,
> and the outer by another capacitor to the largest lump of copper you
> can
> find on the PCB."
>
> Can anyone confirm that this is correct or have any other suggestions?
> I know little about radio electronics and would appreciate help from
> one of you knowledgeable boffins out there.
>
> Here's hoping.
.
What frequencies do these DAB radios receive.
Satellites? Gigahertz etc.?
OP says he 'lost' his FM stations? Surely he needs an FM band radio to
receive them; using either a whip antenna or connecting to and pointing
his FM antenna in the proper direction?
Question puzzles, sorry.
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Author: GarethDate: 16:33 07-12-06
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terry wrote:
> Tyro wrote:
>> I recently bought a Sony CMT-SPZ90DAB mini hi-fi with a DAB radio. The
>> aerial provided is a 2m length of wire connected to one female pin of a
>> a small plastic 3 pin plug which fits into a 3 male pin socket. There
>> is no other aerial connection. Reception in my area is very poor and I
>> have lost most of my favourite FM stations, and can receive only 6 DAB
>> frequencies.
>>
>> I have a roof top mounted FM Yagi with 50 ohm co-ax and an internal
>> "slim jim" DAB aerial with 75 ohm co-ax and no way of connecting
either
>> to the radio. Connecting to the single pin or the aerial wire, and
>> earthing the braid to casing doesn't work.
>>
>> A Google search provided the following from a 2001 post to this group
>>
>> "If you *must* go tampering inside this crap radio, connect the coax
>> inner via a small (100pf?) capacitor to wherever the dangly wire goes,
>> and the outer by another capacitor to the largest lump of copper you
>> can
>> find on the PCB."
>>
>> Can anyone confirm that this is correct or have any other suggestions?
>> I know little about radio electronics and would appreciate help from
>> one of you knowledgeable boffins out there.
>>
>> Here's hoping.
> .
> What frequencies do these DAB radios receive.
> Satellites? Gigahertz etc.?
DAB is around 220 MHz in England.
> OP says he 'lost' his FM stations? Surely he needs an FM band radio to
> receive them; using either a whip antenna or connecting to and pointing
> his FM antenna in the proper direction?
> Question puzzles, sorry.
I think the OP's radio receives (or rather doesn't in the OP's case) FM
as well.
Gareth
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