[TenTec] Eagle AM filter requirement

Bob McGraw - K4TAX RMcGraw at Blomand.net
Thu Feb 6 08:47:52 EST 2014

Yes, Barry is correct to my recall.

As a general statement what is being said,  the 6 KHz filter is required if 
one wishes to transmit AM.  I guess what's not said is one can operate AM 
with the 15 KHz filter as well.   And if one only has the 2.4 KHz standard 
filter then AM operation would not be satisfactory.     Since AM is a double 
sideband signal with carrier,  a filter system of 6 KHz bandwidth is 
required.  Plus there is a difference in center frequency between the 6 KHz 
filter, required to pass both sidebands, where as the standard 2.4 KHz 
filter is intended to pass only one sideband.  I do recall that the FM 15 
KHz filter does have a bit more insertion loss, then the AM carrier output 
will be less than the expected 22 to 25 watts.

I've used the Eagle on AM making many contacts with those that know of my AM 
operations.  In general the audio is described a very good and the 
modulation is very good.  In fact, other than signal strength, most can't 
tell if I'm operating one of my high level transmitters or the Tentec Eagle.

Bob, K4TAX

----- Original Message ----- 
From: "Barry N1EU" <barry.n1eu at gmail.com>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Thursday, February 06, 2014 4:35 AM
Subject: Re: [TenTec] Eagle AM filter requirement

> Mike, my memory is that the 15KHz filter came later and the manual was
> probably written before then.
> 73, Barry N1EU
> On Thu, Feb 6, 2014 at 12:40 AM, Mike Manship <mjmanship at iquest.net> 
> wrote:
>> The ARRL review of the Eagle says that one may operate AM with either the 
>> 6
>> OR the 15kHz filter.
>> The Eagle manual states that the 6 kHz filter is required for AM 
>> operation.
>> Which of these statements is true? I would buy only the 15 if that is all
>> that is needed since that could be used
>> on AM and FM.
>> 73 de Mike W9OJ
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