[Yaesu] Humm in the receive audio from FT1000D
BILL BROWN
ukbrown at acsol.net
Fri Mar 18 20:25:44 EST 2005
I want to thank all who send such excellent suggestions. Last night I
grounded everything plus put all 110vt to same outlet and the hmm went away.
PLus I could not the the TS940s to operate in Vox thru the DXD box. Well I
just hooked up the foot switch so I eliminted that problem sort of. Still
curious why it wont work. I did get the tech notes from Top Ten and will put
the mods in later.
Now for the new problem in getting the rigs to key in cw. Hooked it up per
the Top Ten manual and I am using TRLOG and nothing..any one got any
ideas...When I hook up the interface either thru the Com 1 serial port or
LPT by it self and nothing else No com for the RS232 from the FT1000d or via
the Piexx board from TS940s the computer sends cw perfect its when I hook
up the other stuff and the DXD Box that it just dont work..anyone got any
idea and does the DXD box have the set inside for the interface. or will I
have to incorporate that in the DB25 for the computer to the DXD box. thanks
all PTL bill K0UK
----- Original Message -----
From: <yaesu-request at contesting.com>
To: <yaesu at contesting.com>
Sent: Friday, March 18, 2005 10:00 AM
Subject: Yaesu Digest, Vol 27, Issue 8
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> Today's Topics:
>
> 1. Re: Hmmm in the audio from the FT1000D to the DX Doubler
> (Keith Morehouse)
> 2. Re: Hmmm in the audio from the FT1000D to the DX Doubler
> (Rob K6RB)
> 3. Re: Hmmm in the audio from the FT1000D to the DX Doubler
> (David Jordan)
> 4. Re: Hmmm in the audio from the FT1000D to the DX Doubler
> (Steve Lawrence)
> 5. Re: Hmmm in the audio from the FT1000D to the DX Doubler
> (Pete Smith)
> 6. Re: Hmmm in the audio from the FT1000D to the DX Doubler
> (Steve Lawrence)
> 7. Re: Hmmm in the audio from the FT1000D to the DX Doubler
> (Steve Lawrence)
> 8. Re: Hmmm in the audio from the FT1000D to the DX Doubler
> (Gary Smith)
> 9. Re: Hmmm in the audio from the FT1000D to the DX Doubler
> (Tyler Stewart)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 17 Mar 2005 12:48:34 -0800 (PST)
> From: Keith Morehouse <w9rm at yahoo.com>
> Subject: Re: [Yaesu] Hmmm in the audio from the FT1000D to the DX
> Doubler
> To: yaesu at contesting.com
> Message-ID: <20050317204834.59002.qmail at web60703.mail.yahoo.com>
> Content-Type: text/plain; charset=us-ascii
>
>>Just trying to set up SO2R and having some trouble
>>with humm in the receive audio line from the DX
>>Doubler to the Heil head set.
>
> Bill, I get a little hum in the RX audio when using
> the DXD with a FT1000D and FT1000MPMkV. It's so
> slight that normal band noise covers it up.
>
> Now, the TX path was a different story - when routing
> mic audio through the computer sound card, I had to
> use isolation transformers to knock down what were
> major amounts hum.
>
> Keith
> W9RM
>
>
>
> __________________________________
> Do you Yahoo!?
> Yahoo! Small Business - Try our new resources site!
> http://smallbusiness.yahoo.com/resources/
>
>
> ------------------------------
>
> Message: 2
> Date: Thu, 17 Mar 2005 13:04:35 -0800
> From: "Rob K6RB" <k6rb at baymoon.com>
> Subject: Re: [Yaesu] Hmmm in the audio from the FT1000D to the DX
> Doubler
> To: <yaesu at contesting.com>
> Message-ID: <000401c52b34$efb2e6a0$6501a8c0 at hamputer>
> Content-Type: text/plain; charset="iso-8859-1"
>
> 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
>
>
>
>
> ------------------------------
>
> Message: 3
> Date: Thu, 17 Mar 2005 16:39:26 -0500
> From: David Jordan <wa3gin at erols.com>
> Subject: Re: [Yaesu] Hmmm in the audio from the FT1000D to the DX
> Doubler
> To: Rob K6RB <k6rb at baymoon.com>
> Cc: yaesu at contesting.com
> Message-ID: <4239F90E.5020504 at erols.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> The audio on the Yaesu floats. If you provide a true ground you'll get
> AC hum. The transformer provides some isolation. I have an interface
> circuit that will provide
> you a better method to match the inputs and it's simple to construct.
> I'll email you direct with the attachement of the circuit diagram.
>
> Good luck,
> dave
> wa3gin
>
> 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
>>
>>
>>_______________________________________________
>>Yaesu mailing list
>>Yaesu at contesting.com
>>http://lists.contesting.com/mailman/listinfo/yaesu
>>
>>
>>
>
>
> ------------------------------
>
> Message: 4
> Date: Thu, 17 Mar 2005 13:56:59 -0800
> From: Steve Lawrence <SMLX at earthlink.net>
> Subject: Re: [Yaesu] Hmmm in the audio from the FT1000D to the DX
> Doubler
> To: Yaesu List <yaesu at contesting.com>
> Message-ID: <a3a3c3318109ecb7d1e9ad16ef2e1a28 at earthlink.net>
> Content-Type: text/plain; charset=US-ASCII; format=flowed
>
> FYI -
>
> I don't have experience with a DX doubler. I use a Griffin iMic
> connected to a Mac USB port. I completely eliminated hum by using mini
> telephone modem 600-600 ohm transformers for DC isolation in both of
> the stereo audio out lines and the Mic input line to an FT1000D.
> Additionally, there has been no problem with signal levels.
>
> 73, Steve WB6RSE
>
>
>
> ------------------------------
>
> Message: 5
> Date: Thu, 17 Mar 2005 17:02:15 -0500
> From: Pete Smith <n4zr at contesting.com>
> Subject: Re: [Yaesu] Hmmm in the audio from the FT1000D to the DX
> Doubler
> To: "Rob K6RB" <k6rb at baymoon.com>, <yaesu at contesting.com>
> Message-ID: <6.2.0.14.2.20050317170136.021375d0 at mail.adelphia.net>
> Content-Type: text/plain; charset="us-ascii"; format=flowed
>
> 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
>>
>>
>>_______________________________________________
>>Yaesu mailing list
>>Yaesu at contesting.com
>>http://lists.contesting.com/mailman/listinfo/yaesu
>
>
>
> ------------------------------
>
> Message: 6
> Date: Thu, 17 Mar 2005 14:18:18 -0800
> From: Steve Lawrence <SMLX at earthlink.net>
> Subject: Re: [Yaesu] Hmmm in the audio from the FT1000D to the DX
> Doubler
> To: Yaesu List <yaesu at contesting.com>
> Message-ID: <f56b737037a45b37093dae97d7282267 at earthlink.net>
> Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
>
> Here are the mini telephone modem transformers I used:
>
> http://www.allelectronics.com/cgi-bin/category.cgi?
> category=790750&type=store
>
> 73, Steve WB6RSE
>
>
>
> ------------------------------
>
> Message: 7
> Date: Thu, 17 Mar 2005 14:21:44 -0800
> From: Steve Lawrence <SMLX at earthlink.net>
> Subject: Re: [Yaesu] Hmmm in the audio from the FT1000D to the DX
> Doubler
> To: Yaesu List <yaesu at contesting.com>
> Message-ID: <bc4875be00f4098af1b3dfe11a8aa9e1 at earthlink.net>
> Content-Type: text/plain; charset=US-ASCII; format=flowed
>
> Here are the mini telephone modem transformers I used:
>
> Looks like the link is user connected specific. Try this:
>
> http://www.allelectronics.com/
>
> click on Transformers and then Telephone/Modem Transformers
>
> 73, Steve WB6RSE
>
>
>
> ------------------------------
>
> Message: 8
> Date: Thu, 17 Mar 2005 18:28:35 -0800
> From: "Gary Smith" <wa6fgi at sbcglobal.net>
> Subject: Re: [Yaesu] Hmmm in the audio from the FT1000D to the DX
> Doubler
> To: "Rob K6RB" <k6rb at baymoon.com>, <yaesu at contesting.com>, "Pete
> Smith" <n4zr at contesting.com>
> Message-ID: <004301c52b62$2ff67ec0$a130fea9 at datasmit>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Umm... what is a "DX doubler"? I am in the dark was to what this could be.
> Thanks to all,
> 73,
> Gary... wa6fgi
>
> ----- Original Message -----
> From: Pete Smith
> To: Rob K6RB ; yaesu at contesting.com
> Sent: Thursday, March 17, 2005 2:02 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
> >
> >
> >_______________________________________________
> >Yaesu mailing list
> >Yaesu at contesting.com
> >http://lists.contesting.com/mailman/listinfo/yaesu
>
> _______________________________________________
> Yaesu mailing list
> Yaesu at contesting.com
> http://lists.contesting.com/mailman/listinfo/yaesu
>
>
> ------------------------------
>
> Message: 9
> Date: Fri, 18 Mar 2005 11:58:04 -0500
> From: "Tyler Stewart" <k3mm at comcast.net>
> Subject: Re: [Yaesu] Hmmm in the audio from the FT1000D to the DX
> Doubler
> To: "Rob K6RB" <k6rb at baymoon.com>, <yaesu at contesting.com>, "Pete
> Smith" <n4zr at contesting.com>
> Message-ID: <004101c52bdb$a6a17b00$0200a8c0 at family>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> 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
>>>
>>>
>>>_______________________________________________
>>>Yaesu mailing list
>>>Yaesu at contesting.com
>>>http://lists.contesting.com/mailman/listinfo/yaesu
>>
>> _______________________________________________
>> Yaesu mailing list
>> Yaesu at contesting.com
>> http://lists.contesting.com/mailman/listinfo/yaesu
>>
>
>
>
>
> ------------------------------
>
> _______________________________________________
> Yaesu mailing list
> Yaesu at contesting.com
> http://lists.contesting.com/mailman/listinfo/yaesu
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>
> End of Yaesu Digest, Vol 27, Issue 8
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