[Yaesu] RE: Yaesu Digest, Vol 19, Issue 12

Tue Jul 27 12:34:57 EDT 2004

Hi to all,
This comment is for Marty, WO0Q and anyone dealing with the FT 1000D 
headphone issue, after having gone through several pairs of headphones 
myself, I have found the Yaesu YF-77 to be the best solution as far as good 
sound goes and I tend to overlook the low level hum at minimum AF gain, 
since I typically never use the radio at such low levels of AF gain 
anyway... So eventhough the hum is still present, it mostly remains more an 
"academic" rather than actual problem.
Another pair of headphones that comes very close in terms of audio response 
and can eliminate the hum completely with adjustment of its internal (in 
line ) volume control, is a 16 Ohm model from AIWA which I bought from Radio 
Shack sometime ago, but I do not have their model # with me now. If 
interested, I can look it up when at home and email you....

73,
Marinos, ki4gin

>From: yaesu-request at contesting.com
>Reply-To: yaesu at contesting.com
>To: yaesu at contesting.com
>Subject: Yaesu Digest, Vol 19, Issue 12
>Date: Tue, 27 Jul 2004 12:00:33 -0400 (EDT)
>
>Send Yaesu mailing list submissions to
>	yaesu at contesting.com
>
>To subscribe or unsubscribe via the World Wide Web, visit
>	http://lists.contesting.com/mailman/listinfo/yaesu
>or, via email, send a message with subject or body 'help' to
>	yaesu-request at contesting.com
>
>You can reach the person managing the list at
>	yaesu-owner at contesting.com
>
>When replying, please edit your Subject line so it is more specific
>than "Re: Contents of Yaesu digest..."
>
>
>Today's Topics:
>
>    1. Yaesu 400 series (Stuart Bloom)
>    2. RE: FT-1000 60 Hz Hum Problem (Marty Rosenzweig)
>    3. FT-747/SB-1400 drift (Doug Walker)
>    4. Re: FT-747/SB-1400 drift (Thomas Giella KN4LF)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Mon, 26 Jul 2004 11:41:52 -0700 (PDT)
>From: Stuart Bloom <sbbloom69 at yahoo.com>
>Subject: [Yaesu] Yaesu 400 series
>To: yaesu at contesting.com
>Message-ID: <20040726184152.38942.qmail at web20422.mail.yahoo.com>
>Content-Type: text/plain; charset=us-ascii
>
>Hi,
>I have a FTdx-400 and a FRdx-400 (but no FLdx-400).
>Both are sick, and I've been assembling parts to
>restore them.  I just haven't had time to work on them
>(I'm still working on the house).  I hope to work on
>them this winter since I hope to have my shack and
>workbench moved by October.
>
>Stuart
>KD5HVO
>
>
> > From: "Michael Charteris" <empire1963 at hotmail.com>
> > Subject: [Yaesu] The Classic Silver 400/401 Series
> > Yaesu Equipment of the
> > 	1960's
> > Date: Mon, 26 Jul 2004 08:04:22 +1000
> > To: yaesu at contesting.com
> >
> > Hi There,
> > Mike, VK4QS here. I have just joined the group,
> > though for a while I have
> > been reading the postings. I am a devotee of the
> > Yaesu FLDX400 TX//FRDX400
> > RX, as well as the FT400/401 series that came out in
> > the late 1960's early
> > 1970's, and the above sets are what make up my
> > station here in Ipswich,
> > Queensland, Australia.
> >
> > Having said that, I did a search of the Postings for
> > the Yaesu 400/401
> > series and there was only 3 postings from memory. I
> > noticed that Harry
> > Leeming G3LLL is a member of the group, and I would
> > just like to say harry I
> > have read and have a copy of your excellent article
> > on the FT401,
> > "A Fresh Lookat the FT401". I would be very
> > interested to know Harry, if you
> > ever serviced or had anything to do with the FRDX400
> > and the FLDX400 Twins,
> > and if so, would you say that they had much in
> > common with the Collins
> > "S-LINE of the time, seeing that the Yeasu Twins had
> > Mechaincal Filters. I
> > had heard a rumour that Yaesu actually tried very
> > hard to follow and copy
> > Collins in there early sets like the FR/FLDX400
> > Twins, though i am not sure
> > of any truth about that. Perhaps you might be able
> > to put paid to that
> > rumour Harry.
> >
> > I am curious as to how many of the other member of
> > the group actually have
> > and use or have had inthe past the FRDX400/FLDX400
> > Twins. It would be good
> > to hear from you as there are a many of them out
> > there under benches doing
> > nothing I reckon. I have owned many Yaesu's in the
> > past, from the FT200 to
> > the FT401B, but never an FT101E series. My mainstay
> > Rig in the shack is the
> > Yaesu FT980, circa 1984 or so, and it goes like a
> > treat, often receiving
> > excellent reports for the transmitted signal and
> > Audio. I wonder how many
> > have FT980 in the group also.
> >
> > Anyway friends I look forward to hearing from you
> > and seeing your postings
> > if perhaps they apply to your station. I really
> > enjoy the Classic Yaesu's of
> > the 1960's, and perhaps you do too.
> > All the best for now
> > Cheers Mike VK4QS
>
>
>
>
>
>__________________________________
>Do you Yahoo!?
>New and Improved Yahoo! Mail - 100MB free storage!
>http://promotions.yahoo.com/new_mail
>
>
>------------------------------
>
>Message: 2
>Date: Mon, 26 Jul 2004 15:24:35 -0600
>From: Marty Rosenzweig <marty at cmn.net>
>Subject: [Yaesu] RE: FT-1000 60 Hz Hum Problem
>To: yaesu at contesting.com
>Message-ID: <41057693.5070703 at cmn.net>
>Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>Greetings,
>Well Marinos gets the grand prize today! I tried a pair of Koss phones
>and no hum. The Koss measured about 240 ohms...I know that's DC
>resistance, not impedance, but it does indicate a much higher impedance
>than the Yaesu phones which measure about 34 ohms DC. A couple of 220
>ohm resistors in series with each "channel" and the hum is gone with a
>somewhat higher AF gain control position than without the resistors.
>Interesting that Yaesu doesn't design phones appropriate for (at least)
>this radio (or maybe not designing radios for common low impedance
>phones!), and it also explains why some FT-1000 users don't experience
>the hum at all.
>I expect it's all an exercise in technology and the radio really doesn't
>perform any better now, with the modification, but the knowledge is
>worth the effort!
>That brings me to the question of what people like in headphones,
>particularly for the 1000, I guess? I bought the Yaesu phones to
>optimize voice and, primarily, CW response  as opposed to the wide
>bandwidth of high quality audiophile phones. They're also much lighter
>than the Koss I used to use.
>
>Any ideas?
>
>Thanks to everyone who responded and ain't the Internet (and this list)
>a great resource?
>
>73,
>
>Marty
>WO0Q
>
>
>Marinos Markomanolakis, M.D. wrote:
>
> > Dear Marty,
> >
> > My 1000D has the same low hum noticeable only when using the
> > headphones and having the AF pot all the way CCW. I have seen this in
> > other rigs too TR7, Tube radios etc and it is related to the use of
> > low impedance headphones.
> > If you try using headphones with low (16 Ohm) impedance that either
> > have volume control or you can add a variable resistance in series
> > with them before going to the radio, you will see the problem
> > disappearing when you increase the resistance and returning when going
> > back towards the 16 Ohm.
> > Then you can check the added resistance value with a multimeter and
> > add a small (or 2 one in each channel) resistor within a Radio Shack
> > large stereo plug and then connect your headphones through it to the
> > 1000D.
> > Of course in doing so you will have some attenuation in your audio but
> > the hum will be gone.
> >
> > Hope this helps,
> >
> > 73,
> > Marinos, sv9dru/w4 or KI4GIN
> >
> >
> >>
> >> Greetings,
> >> I have a 1992 FT-1000 which, with the RF and AF gain CCW (off) and
> >> everything disconnected from the radio except a pair of Yaesu
> >> headphones, has a very noticeable 60 Hz hum (about 5 mv on the scope,
> >> both channels (ie., main and sub in "stereo").
> >
> >
>
>
>
>
>------------------------------
>
>Message: 3
>Date: Mon, 26 Jul 2004 22:02:33 -0500
>From: "Doug Walker" <dwalker at telepak.net>
>Subject: [Yaesu] FT-747/SB-1400 drift
>To: <yaesu at contesting.com>
>Message-ID: <001001c47386$2a52fc30$cea2af42 at your6pdpt9ypa2>
>Content-Type: text/plain;	charset="iso-8859-1"
>
>I have a Heath SB-1400 (repackaged FT-747) that drifts around 500 cycles 
>before settling down. Any suggestions. Once it settles down, it performs 
>pretty good, and I have left it powered up 24/7 as a means of combating the 
>problem, but I got the radio to use mobile, so I need to get it stable 
>before putting it in my car. Any suggestions? They would be greatly 
>appreciated.
>Doug N5LIP
>
>------------------------------
>
>Message: 4
>Date: Mon, 26 Jul 2004 23:24:29 -0400
>From: "Thomas Giella KN4LF" <kn4lf at tampabay.rr.com>
>Subject: Re: [Yaesu] FT-747/SB-1400 drift
>To: "a Yaesu E-Group" <yaesu at contesting.com>
>Message-ID: <001e01c47389$3a599640$6401a8c0 at thomas>
>Content-Type: text/plain;	charset="iso-8859-1"
>
>The cold start 500 hz drift is within rated specs for that rig. An optional 
>and more stable TCXO master reference oscillator would probably help allot. 
>I think the FT-747GX uses the TCXO-4, same as the FT-840.
>
>73,
>Thomas F. Giella, KN4LF
>Plant City, FL, USA
>Grid Square EL87WX
>Lat & Long 27 58 31 44N 82 09 51 98W
>
>PODXS 070 PSK31 Club Member #349
>
>KN4LF Solar Space Weather & Geomagnetic Data Archive: 
>http://www.kn4lf.com/kn4lf5.htm
>KN4LF Daily HF/MF Radio Propagation Outlook: 
>http://www.kn4lf.com/kn4lf6.htm
>KN4LF HF/MF Radio Propagation Theory Notes: http://www.kn4lf.com/kn4lf8.htm
>KN4LF Amateur & SWL Radio History: http://www.kn4lf.com
>   ----- Original Message -----
>   From: Doug Walker
>   To: yaesu at contesting.com
>   Sent: Monday, July 26, 2004 11:02 PM
>   Subject: [Yaesu] FT-747/SB-1400 drift
>
>
>   I have a Heath SB-1400 (repackaged FT-747) that drifts around 500 cycles 
>before settling down. Any suggestions. Once it settles down, it performs 
>pretty good, and I have left it powered up 24/7 as a means of combating the 
>problem, but I got the radio to use mobile, so I need to get it stable 
>before putting it in my car. Any suggestions? They would be greatly 
>appreciated.
>   Doug N5LIP
>   _______________________________________________
>   Yaesu mailing list
>   Yaesu at contesting.com
>   http://lists.contesting.com/mailman/listinfo/yaesu
>
>
>   ---
>   Outgoing mail is certified virus free by Grisoft AVG 6.0.
>   Checked by AVG anti-virus system (http://www.grisoft.com).
>   Version: 6.0.727 / Virus Database: 482 - Release Date: 7/26/2004
>
>------------------------------
>
>_______________________________________________
>Yaesu mailing list
>Yaesu at contesting.com
>http://lists.contesting.com/mailman/listinfo/yaesu
>
>
>End of Yaesu Digest, Vol 19, Issue 12
>*************************************

_________________________________________________________________
Is your PC infected? Get a FREE online computer virus scan from McAfee® 
Security. http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963