[1000mp] Questions about Mark V

[Bob Main]

You are correct about 10 and 12mtrs.  There appears to be two tuned preamps 
and one is for 24-30MHz.  That is why you see the difference up there.

Bob
KB4CL

----- Original Message ----- 
From: "Garry Shapiro" <garry at ni6t.com>
To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>
Sent: Saturday, January 22, 2005 5:57 PM
Subject: RE: [1000mp] Questions about Mark V


> 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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>>
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