[ARC5] My 10 meter BC-454...

[Leslie Smith]

Ken,
Speaking generally, stability diminishes with the square of the
frequency, so IF a 3 to 6 MHz receiver is stable within (say) 4 KHz at
3MHz, I'd expect the same set using the same style of constructing &
quality components to drift by 40kHz, approximately.  Not good for SSB. 
OK as a 2m tunable IF, I think.

73 from Australia, 
(
where the temperature 5 km from my home was measured by the BOM (Bureau
of Metrology) thermometer at 44.3 degrees one week ago)
 
  Leslie Smith
  vk2bcu at operamail.com


On Thu, Jan 24, 2013, at 13:14, Kenneth G. Gordon wrote:
> On 23 Jan 2013 at 19:55, David Stinson wrote:
> 
> > 
> > ----- Original Message ----- 
> > From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
> > 
> > > Well, I fired it up this afternoon:...
> > > 
> > > And it is quite obvious that the original owner 
> > > never did finish his masterpiece...
> > 
> > As was the case with the great majority of so-called "conversions."
> > I've been looking at "converted" Command Sets for decades. The number
> > actually finished into something useful is a fraction of the thousands
> > of them just chopped into scrap.
> 
> That is interesting: I have several BC-453s and R-23/ARC-5 chopped into 
> single channel VLF receivers, all set up for 22.3 KHz. Some even have 
> crystal-controlled BFOs. I have several 85 KHz crystals now.
> 
> > But since this one is already "done up,"
> > I'd be very interested in how it works-out, Ken.
> > Gordon- Wasn't there another tube you could sub
> > for the 12SK7 in the RF?
> 
> 12SG7 for one.
> 
> BTW, I aligned the IFs: they were WAAAAAAY off. Gain was substatially 
> improved.
> 
> I then tried to align the HFO. It now tunes from about 28.25 to 30 MHz.
> 
> It is NOT very stable. It sounds as though the HFO coil is hanging loose
> in 
> the box.
> 
> I may fix that.
> 
> Ken W7EKB
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

-- 
http://www.fastmail.fm - Accessible with your email software
                          or over the web