From: yaesu-request@contesting.com
Reply-To: yaesu@contesting.com
To: yaesu@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@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@contesting.com
You can reach the person managing the list at
yaesu-owner@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@yahoo.com>
Subject: [Yaesu] Yaesu 400 series
To: yaesu@contesting.com
Message-ID: <20040726184152.38942.qmail@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@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@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@cmn.net>
Subject: [Yaesu] RE: FT-1000 60 Hz Hum Problem
To: yaesu@contesting.com
Message-ID: <41057693.5070703@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@telepak.net>
Subject: [Yaesu] FT-747/SB-1400 drift
To: <yaesu@contesting.com>
Message-ID: <001001c47386$2a52fc30$cea2af42@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@tampabay.rr.com>
Subject: Re: [Yaesu] FT-747/SB-1400 drift
To: "a Yaesu E-Group" <yaesu@contesting.com>
Message-ID: <001e01c47389$3a599640$6401a8c0@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@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@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@contesting.com
http://lists.contesting.com/mailman/listinfo/yaesu
End of Yaesu Digest, Vol 19, Issue 12
*************************************