[Boatanchors] SR-2000 and AM mode

[jeremy-ca]

If youre going to run the NCL-2000 on AM do it in the CW position, its just 
as linear and be satisfied with 250W out. With a well oiled blower it should 
be fine as you are well below the rated dissipation. Just dont lock the 
D-104 and walk away.

Carl
KM1H
National Radio 1963-69
Member of NCL-2000 Design Team



----- Original Message ----- 
From: "Mark Shaum" <k9tr at dtnspeed.net>
To: <boatanchors at mailman.qth.net>
Sent: Saturday, March 29, 2008 9:50 PM
Subject: [Boatanchors] SR-2000 and AM mode


> Dave asks:
>
>>The Hallicrafters SR2000 does not have an AM (or DSB)
>>position, at least mine does not.
>
>>Interesting possibility. Doea anyone know of a non
>>destructive reversible mod to use the Hurricane on AM?
>
>>Dave, W5WP
>
> Well.. unbalance the balanced modulator a bit to get some resting carrier 
> out, maybe 50-100 watts.  Advance the mic gain while watching the output 
> with a scope and you should be able to generate some reasonably 
> intelligible AM, although it will just be a carrier with one sideband. 
> Clip a capacitor across the IF filter and you will have both sidebands 
> with the carrier, but watch for spurious sigs.
>
> On receive, you will probably be stuck with zero beating the carrier and 
> limited bandpass.  I don't know if the SR-2000 has an AM receive mode with 
> a diode detector or similar.
>
> I really don't suggest the above with the Hurricane.  I've used my 
> NCL-2000 as an AM linear at about 300 watts carrier output and those 
> 8122's put out a LOT of heat in that service.  It's rough on the tubes and 
> they aren't cheap nowadays.
>
> Mark K9TR
>
> _______________________________________________
>