[Yaesu] Hmmm in the audio from the FT1000D to the DX Doubler

[Tyler Stewart]

They also sell a 600 ohm hybrid transformer that allows you to split your 
mike audio to 2 radios with good impedance matching and frequency response. 
They were a bit large phsically, but about $5 a piece.

Ty K3MM

----- Original Message ----- 
From: "Pete Smith" <n4zr at contesting.com>
To: "Rob K6RB" <k6rb at baymoon.com>; <yaesu at contesting.com>
Sent: Thursday, March 17, 2005 5:02 PM
Subject: Re: [Yaesu] Hmmm in the audio from the FT1000D to the DX Doubler


> There is also a tech note on the top Ten web site about dealing with hum.
>
> Mouser has inexpensive small audio iso transformers that have less loss
> than Radio Shax.
>
> 73, Pete N4ZR
>
> At 04:04 PM 3/17/2005, Rob K6RB wrote:
>
>>Had the same problem with two FT-1000Ds and a DX Doubler. For some 
>>reason -
>>never did figure it out - when the two radios are connected to the 
>>Doubler,
>>there is an inordinate amount of hum in the Heil Pro Set phones. I tried
>>tracing the wires, thinking there might be a misplaced ground in the 
>>Doubler
>>cables, but found nothing. Even with the Doubler off, and the power 
>>removed,
>>the hum was there. I finally eliminated most of it by buying 1:1 audio
>>transformers at Radio Shack, and isolating the audio lines from the D's to
>>the Doubler. There is some attenuation of the audio as a result, but the 
>>hum
>>is now gone for all practical purposes. It is evidently an issue with the
>>Yaesu, because I used the Doubler with a D and an IC-751A, and the Icom's
>>audio was hum free! Hope that helps.
>>
>>Rob K6RB
>>
>>
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>
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