[TenTec] Eagle IF output

[dukeshifi]

It’s not QUITE useless because one can indeed get a band spectrum using it. However, the strong peak at 9.025 MHz is stronger than the band spectrum. It is fixed in position so that frequency would be “invisible” on any SDR or other  device (such as my spectrum analyzer). 

Still, I played with the Eagle for a while with my spectrum analyzer as a readout and it was generally as useful as, say, a Kenwood SM-220 with BS-8 bandscope board. In fact, an SM-220, with its center point set to 9 MHz,  would work rather well with this IF output on the Eagle, aside from the prominent peak 25 KHz from the IF center point. Since that peak never moves, you can account for it in routine use.

Gary

W0DVN

PS: I do not know why this peak is there!

> On Aug 7, 2022, at 9:29 PM, Barry N1EU <barry.n1eu at gmail.com> wrote:
> 
> Several years back I posted my impression that the RX366/Eagle RX factory
> provided IF output was essentially useless (bordering on non-functional).
> The IF output mod documented by Rick VE7TK/VE7ASR works great on the Orion
> I/II and I documented a similar mod for the Omni VI/VI+.  I'm not sure if a
> mod was documented for the Eagle.
> 
> It might have been a mix up in Ten Tec engineering at the time that
> resulted in that jack being characterized as a usable IF output.
> 
> That's as far as my memory goes.
> 
> 73, Barry N1EU
> 
> 
> 
> On Sun, Aug 7, 2022 at 4:56 PM dukeshifi <dukeshifi at comcast.net> wrote:
> 
>> I answered my own question. This is indeed an IF output and, with the
>> analyzer gain cranked way up, I get a spectrum of the Eagle. However, I get
>> a constant peak 25 KHz above the 9.000 MHz centerline.
>> 
>> Also, the passband tuning is not centered. Does anyone know the adjustment
>> for this?
>> 
>> Gary
>> 
>> W0DVN
>> 
>>> On Aug 7, 2022, at 6:21 PM, dukeshifi <dukeshifi at comcast.net> wrote:
>>> 
>>> I have a late Eagle. It has a coax going from the RX-TX board to an RCA
>> jack on the back. The cable plugs into TMP jack 15. This is not shown on
>> the Eagle schematic I have.
>>> 
>>> Is this an IF output? If so, I cannot seem to view its output with my
>> spectrum analyzer tuned to 9.0 MHz center.
>>> 
>>> Any help?
>>> 
>>> Gary
>>> 
>>> W0DVN
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