[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/
> >   
> 
> 
>  __________________________________________________
> Do You   Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam
>  protection around  
> http://mail.yahoo.com 
> ----
>  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/_
> (http://www.qsl.net/icom/)    
> 
> 
> 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
> Icom FAQ: http://www.qsl.net/icom/
>  


__________________________________________________
Do You  Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around  
http://mail.yahoo.com 
----
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/_ (http://www.qsl.net/icom/)   


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


More information about the Icom mailing list