[1000mp] Questions about Mark V

[Garry Shapiro]

It's about the difference between a preselector and a preamplifier, i.e.
bandwidth. If you do not have very strong out-of-band signals that could
cause front-end overload, it seems to me that it does not matter much. But
on 160, for example, strong B/C stations may be present, not all that far,
percentage-wise from where you are listening. (I was also astounded to
discover that several commercial coastal stations below the BC band were
absolutely HUGE here.) Another factor is whether one needs the gain
differential on a band like 160, which is not noise-floor limited.

For weak signal topband DXing from my QTH, which is ringed by canyon walls,
I tend to use FLAT. During 160 contests, which for me have largely been
domestic contests, I am frequently better off using TUNED or IPO.

On 10 and 12m, it is another story. There the preamp gain in TUNED exceeds
FLAT and is essential, at least for me.

Garry, NI6T

-----Original Message-----
From: 1000mp-bounces at mailman.qth.net
[mailto:1000mp-bounces at mailman.qth.net]On Behalf Of Bob Main
Sent: Saturday, January 22, 2005 4:57 AM
To: All about Yaesu 1000mp
Subject: Re: [1000mp] Questions about Mark V


True, but what I still am wondering is if FLAT is a broadband preamp that
gives me more gain (so the manual says), then why ever use it in TUNED mode?
It seems to me that in TUNED mode because you loose some of your gain that
this would hinder hearing weaker stations.  Although I will admit the amount
that you hear them between the two choices may not be that noticable, there
is still a loss of gain between TUNED and FLAT.  (By the way, I set mine to
TUNED when I got the radio years ago, since I have read the manual again and
came to the above understanding I am wondering, why did I do that and
looking for some justification in it before I switch it to FLAT.)

73s
Bob

----- Original Message -----
From: "Garry Shapiro" <garry at ni6t.com>
To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>
Sent: Saturday, January 22, 2005 1:09 AM
Subject: RE: [1000mp] Questions about Mark V


> And selecting IPO bypasses the TUNED/FLAT stuff entirely.
>
> Garry, NI6T
>
> -----Original Message-----
> From: 1000mp-bounces at mailman.qth.net
> [mailto:1000mp-bounces at mailman.qth.net]On Behalf Of Bob Main
> Sent: Friday, January 21, 2005 7:22 PM
> To: w2nra at optonline.net; All about Yaesu 1000mp
> Subject: Re: [1000mp] Questions about Mark V
>
>
> Actually Art, the there are two tuned amps.  One covers 160-40 and the
> other
> is 12-10, so 17, 20 and 30 are not covered and even for 20 mtrs they say
> that the difference between the flat and tuned would be minor anyway.
>
> Bob
> KB4CL
>
> ----- Original Message -----
> From: "Art Searle W2NRA" <w2nra at optonline.net>
> To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>
> Sent: Friday, January 21, 2005 9:00 PM
> Subject: Re: [1000mp] Questions about Mark V
>
>
>> Hi Bob
>>
>> Bob Main wrote:
>>
>>> Page 44 - A "wide band" or a "tuned" preamp is available and set by menu
>>> 8-4.  It appears you get a high gain if 8-4 is set to "flat" whether
>>> than
>>> "tuned".  I don't understand what having it set to "tuned" does for you.
>>
>> I think of this as a choice between a broadband preamp and a preselected
>> preamp.  You only have the choice 20 meters and below.
>>
>>> Page 45 - IPO, according to the manual it says if you are below 10MHz
>>> that they suggest it be engaged.  Last night I was on 40 mtrs and played
>>> with the button and heard no change where I was listening.  What is your
>>> understanding of when this is useful?
>>
>> The IPO button is a preamp on/off in reverse.  When the IPO is off the
>> preamp is on  When the IPO is on the preamp is off.
>>
>> 73,
>> Art
>> W2NRA
>>
>>
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