[ICOM] Another R-7000 question
Bonddaleena at aol.com
Bonddaleena at aol.com
Thu Dec 8 18:56:57 EST 2005
In a message dated 12/8/2005 6:38:09 PM Eastern Standard Time,
w3uhf at yahoo.com writes:
Hi Ron,
Sure, no problem. There is another variation of
IC-R7000 Power Supply that needs to be mentioned, and
that is the "special" version that EEB (Electronic
Equipment Bank, Vienna, VA) installed as part of it's
high-performance mods for the R-7000. While many of
the mods were intended for the "alphabet" agencies,
for various reasons, they were also made available to,
and marketed to, amateurs.
EEB's internal AC power supply replacement for the
R-7000 was intended, I believe, to power additional
external 12 volt equipment used, ahem, in conjunction
with the R-7000. Using this replacement supply, the
user could plug the R-7000 into a wall socket in the
hotel room, or wherever, and using a modified CK-70
plug, could power the R-7000 and ancillary equipment
via a tap off from the plug, without having to carry
extra wall warts or other power devices for the
ancillary equipment.
This is important to note, as the power supply they
designed and fitted into the R-7000 creates some
issues. The existing ICOM power supply was removed,
including the specially-wound low-profile transformer.
EEB installed a more conventional, higher current
transformer, like a Triad, but the physical
orientation of the transformer caused the flux lines
from the transformer to FM the VCO at a 60 Hz rate.
Normally, when using FM (which is what the R-7000 was
intended originally for, SSB was an afterthought) this
effect was not noticeable. When using SSB, however,
the quality of the SSB signal is poor at best, due to
the low-level FM'ing of the VCO that won't go away. It
causes the SSB audio to have a raspy quality.
Like so many other things, I discovered this by
accident in a customer's radio and proved the
cause/effect by rotating the transformer 90 degrees.
Unfortunately, the transformer could not be re-mounted
this way permanently, due to size constraints.
So, any users out there who have an EEB radio with
raspy sounding SSB audio, that is the problem. Perhaps
an application of mu-metal foil on the sidewall that
separates the power supply and the VCO compartment
would help, although I haven't tried this.
73 Frank W3UHF
--- Bonddaleena at aol.com wrote:
> In a message dated 12/8/2005 5:03:52 PM Eastern
> Standard Time,
> w3uhf at yahoo.com writes:
> Ron,
>
> The "default" radio had no DC connector on the
> radio
> side, just a blank rectangular cover plate. When
> you
> installed the optional IC-CK70 DC Kit (originally
> made
> for the IC-R70, hence the "70" in the part number),
> a
> new connector plate was installed on the radio, in
> lieu of the blanking plate. This option gave
> external
> access to the internal 12 vdc supply output, and 12
> vdc radio input. The supplied jumper plug was wired
> so
> that the internal 12 vdc supply looped back inside
> the
> radio. When using the external DC cable supplied
> with
> the IC-CK70 Kit, one could remove the jumper plug,
> connect the DC cable, and power the radio with an
> external DC source. This was particularly handy for
> "alphabet" agencies doing surveillance from a van,
> OR
> hams using the receiver in a "mobile environment",
> you
> decide. The mention of "no connector" in the
> operator's manual is consistent with the stock
> version
> R-7000.
>
> Hope this helps.
>
> 73 Frank W3UHF
>
>
>
>
> --- Bonddaleena at aol.com wrote:
>
> > Hello. I was looking at my R-7000 last night and
> it
> > appears 'different' from
> > the Owner's Manual.
> > In the OM, there is a picture of a connector and
> > jumper located on the rear
> > panel where the AC connector reside. The OM
> states
> > "your radio will not have
> > this connector". Strange, mine has it.
> > Looking at the schematic, this connector (P4 on
> the
> > Regulator Unit) simply
> > has the jumper P2 plugged into it. It supplies 12
> > VDC from the internal P/S
> > to the P1 / P11 connector.
> >
> > My question is this: Is it unusual for an R-7000
> to
> > be able to be powered by
> > 12 VDC instead of AC?
> > Does anyone else have this DC port on their
> radio?
> >
> > Just curious.....
> >
> > ron
> >
> > N4UE
> >
> > ----
> > Your Moderator: Dick Flanagan K7VC,
> > icom-owner at mailman.qth.net
> > Icom Users Net: Sundays, 1700Z, 14.316 MHz
> > Icom FAQ: http://www.qsl.net/icom/
> >
>
>
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> Your Moderator: Dick Flanagan K7VC,
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> Icom Users Net: Sundays, 1700Z, 14.316 MHz
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>
>
> Thank you Frank!
>
> This answers yet another dumb question of mine!
>
> ron
>
> N4UE
> ----
> Your Moderator: Dick Flanagan K7VC,
> icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
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>
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Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
Icom Users Net: Sundays, 1700Z, 14.316 MHz
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Frank, wow! Great info. You really know your Icoms.
As a side question:
I mentioned that I have an R71A. Although there is very limited overlap of
coverage, I tuned to some of the,er, dialogue on 26.185 Mhz. Switching the same
antenna and with both radios using identical speakers.
The R71A's audio quality is poor compared to the R7000. I understand that
Kiwa has a capacitor 'kit' to help with the 'wooley' audio, Have you ever done
this mod?
thanks,
ron
N4UE
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