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Press,
What is the model number for your supply!!!!!!!!!!!!
There is no way to tell at MCM.
Thanks Bill W9WCR

What is the model number for your supply!!!!!!!!!!!!
There is no way to tell at MCM.

It's MCM part number 28-2200

Maybe viewable at:


Pres Waterman W2PW
c/o Patchogue Motors, Inc.
Long Island Ford and Kia dealer

GO BILLS!

Hi everyone,

I have one of these and tried it with the 817 but it does seem to
generate a good amount of RF hash. Has anyone found a 2A wall wart type
transformer that works with the 817 without the hash ?

Has anyone tried the PS that Universal Radio sells for the 817

73,

John
N3ZQJ

Pres Waterman wrote:

To bad John, I was hoping the supply Press was talking about was not a swithching supply.
I did buy a CUP36-12-1 which is the one Universal radio sells and found there was a LOT of RF hash
when using a whip antenna like the ATX. I did try several chokes and nothing helped.
Universal said in their ad "we also added a surface mount capacitor right inside the plug to reduce
RFI. " I dont see how that would help? If so I would do it in a second and be done with this hunt for
THE supply.

My kingdom for a analog 2 amp wall wart!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
73 Bill W9WCR

Thanks for the info Press.

Bill W9WCR

GO CUBS................

I don't think you will find any switch mode PSU that does not
generate hash when the radio is used with an antenna close by it (or
mounted on it.) I got a SMPS from Maplin here in the UK and I found
that the problem is the hash is on the outer (negative) lead, which
is not connected to mains ground. It gets on to the radio via this,
and from there to the antenna. Two ways I found to reduce it were a)
to ground the radio to a suitable ground such as a central heating
radiator, and b) when splicing on the 817 connector, to wind a great
many turns of the power cord on to a ferrite ring such as is used for
RF breakthrough prevention. But it still isn't as quiet as a
transformer-based PSU.

It's perfect when used with an outdoor antenna, however.

Julian, G4ILO


--- In FT817@y..., John Lewitzky <johnl@P...> wrote:

Hi everyone,

I have one of these and tried it with the 817 but it does seem

to

generate a good amount of RF hash. Has anyone found a 2A wall wart

type

transformer that works with the 817 without the hash ?

Has anyone tried the PS that Universal Radio sells for the 817

73,

John
N3ZQJ

Pres Waterman wrote:

I tried this with the one I bought (well not a surface mount cap) and
it made no difference at all. The reason was the hash is on both DC
leads. The DC lead was actually coaxial, with negative the outer.
Winding a lot of turns on to a ferrite ring close to the FT-817 plug
made the biggest reduction in hash.

Julian, G4ILO

To bad John, I was hoping the supply Press was talking about was not a

swithching supply.

I did buy a CUP36-12-1 which is the one Universal radio sells and found

there was a LOT of RF hash

when using a whip antenna like the ATX. I did try several chokes and

nothing helped.

Universal said in their ad "we also added a surface mount capacitor right

inside the plug to reduce

RFI. " I dont see how that would help? If so I would do it in a second and

be done with this hunt for

THE supply.

My kingdom for a analog 2 amp wall wart!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

The supply is NOT switching. Less than $20 at MCM.

Well regulated at multiple voltages including 12v

Thanks

Pres Waterman W2PW
c/o Patchogue Motors, Inc.
Long Island Ford and Kia dealer

GO BILLS!