[1000mp] (Was 160 m reception) Antenna Connector Summary & Technical Overview Manual

Fri, 15 Mar 2002 10:01:21 -0500

For the current topic about the antenna connectors and their status. The
forwarded email posted below my sign out is the more recent output on that
topic and includes info on the supplemental material you can order from
Yaesu, and where to find a copy on the internet for looking at while your
waiting on the mail. If you go back to the time period for that message, you
will find other postings, not all with the same subject exactly.

On my hard drive I have the archives for the FT-1000MP reflector that go
back to the beginning reflector that used to be Jehosophat.com that is no
longer functional. Then the two stages of reflectors on this system. Will be
glad to dig anything out of those that any one would like copies of. Have
shared a lot of the most common files with many on this list over  the
years.

73 from Bill - WD8ARZ
wd8arz#ix.netcom.com

----- Original Message -----
From: "WD8ARZ" <[email protected]>
To: <[email protected]>
Sent: Saturday, December 01, 2001 19:27
Subject: FT-1000MP Three Antenna Options - Grounded?

FT-1000MP Technical Overview Manual (B9200182B 1999.11 QS - not the service
manual) page 7 shows a Figure 2-1 Antenna Selection block diagram.

The text for this diagram is as follows:

(A) Antenna Selection and Switching

The FT-1000MP provides two SO-239 ('M') female connectors on the rear panel,
with 'A/B' selection via a front panel switch. Although multiple antenna
jacks are occasionally seen in other transceivers, they frequently suffer
from poor isolation, leading to signal bleed-through from the antenna(s) not
in use. In the FT-1000MP, the unused antenna jack is shorted to ground to
ensure total isolation.

A separate receive-only 'RX ANTENNA' access path is provided via a pair of
RCA connectors. These allow special receiving filters or preamplifiers to be
inserted into the receive line, or they allow attachment of a receive-only
antenna such as a loop or Beverage antenna for low-band reception.

A surge suppresser is included on the antenna input line, so as to suppress
static 'spikes' which could damage the input diodes and/or transistors.'

The circuit diagram in the Technical Supplement (Service Manual) page 6V-1
Labeled ANT Unit, does show the A and B SO-239 antenna connections
supporting grounding during transmit using relay's.

The circuit for the RX Antenna routes from the ANT Unit to the LPF Unit in
the Service Manual schematic on page 6L-1. This portion does show a
suppression device called a D6007 with a number below it of DSP-201M-S00B,
and it does go to ground off the RX antenna line. D6007 on page 6L-6 parts
listing does call it a SURGE ABSORBER MFGR'S DESIG Number DSP201M-S00B and a
YAESU P/N of Q9000375.

Well, I am pleased that Yaesu went to this detail to protect our antenna
inputs. After all the above, now what?

1) For normal operation's on single antenna I see no need to do anything any
different.

2) Using more than one antenna through the A/B selection, and no linear amp,
I still don't see the need to do anything different.

3) Using the RX Antenna Rca connection, I would want to use some external
protection just as an extra level of protection. Most surge suppressors fail
after so many hits. How do you know when that has happened and it didn't
short out? The next hit takes out other solid state devices...... ugh. An
external relay and or suppressor is still a good idea here.

4) If using a linear amp, I would want ALL antenna inputs with external
protection as covered in previous threads. Would also look at protection for
the computer connector.

None of this information has been verified by me for the FT-1000MkV, though
I would expect it to be the same. I can not say for sure, so can not answer
questions addressed to me about that.

73 from Bill - WD8ARZ
[email protected]

----- Original Message -----
From: "Marc Wullaert" <[email protected]>
To: "1000mp reflector" <[email protected]>
Sent: Saturday, December 01, 2001 15:23
Subject: [1000mp] mp RX ANT ???? Grounded
>
> Hi ,
> Is the RX antenna input on the 1000mp grounded while transmitting ?
>
> Or  should I build some input protective circuit like on page 3-15
> from on4un john low-band dxing book.
>
> 73
> marc on4ma

----- Original Message -----
From: "Duncan Cameron" <[email protected]>
To: <[email protected]>
Sent: Saturday, May 19, 2001 10:28
Subject: Re: [1000mp] Mark V Tech Review Manual
>
> The "Technical Overview" manual for either the 1000MP or MK5 are available
> by mail.  You just need to email and request one from
> " [email protected] ".  They are free!
> Regards,
> Scott Cameron

----- Original Message -----
From: "Doug McCann VA3CR" <[email protected]>
To: <[email protected]>
Sent: Sunday, December 02, 2001 11:38
Subject: RE: [1000mp] Re: Document - Technical Overview Manual
>
> The Technical Overview is available from Yaesu, and until it arrives, it
is
> on my web page at:
> http://www.qsl.net/va3cr/ , Enter the FT1000MP Web Site, and then click
> on the link, Technical Overview.
>
> Doug McCann VA3CR
> http://www.qsl.net/va3cr

----- Original Message -----
From: "Pete Smith" <[email protected]>
To: "WD8ARZ" <[email protected]>
Sent: Monday, December 03, 2001 17:51
Subject: Re: RX Antenna from ANT Unit to the LPF Unit - MP
>
> Hi Bill - I've ordered the technical overview from Yaesu.  Unfortunately,
> the Mark 5 owner's manual doesn't even say which of the RX antenna jacks
> (in and out) is to be used for the external antenna, much less what the
two
> jacks are for.  I wish there was a diagram such as you describe in the MP
> manual, but no such luck.
>
> Thanks for your help.
>
> 73, Pete N4ZR
> www.qsl.net/n4zr