[HBR] My New HBR-13 Running FB on 40m CW

[Bill Cromwell]

Hi,

As forsweeping the passband look up "wobbulator" via your favorite 
search engine. You can build your own. Include a marker generator.

73,

Bill  KU8H

On 7/12/19 9:58 AM, ejparagi--- via HBR wrote:
> Hello Scott,
> 
> I too have been following the story of your HBR build and I agree with others who have complemented you on  your construction.  I think part of the reason more people don't take on a large project like this is the amount of time spent on metal working to make a good looking finished product.
> 
> In the absence of a spectrum analyzer and tracking generator, one can look at IF passbands with a sweep generator, a bridge, a diode detector and an oscilloscope.  I used such an arrangement for many years while aligning VHF and UHF low pass transmitter filters.  The 'scope display will look just like a textbook plot when all is set up correctly and the circuit is swept at the correct speed.  The bridge and detector were actually combined in a trade-marked device called a "Rho-tector," which was a common item in RF labs 40 years ago.  I think they were made by Telonic Microwave, but I cannot verify that at the moment.  There isn't much to one- you could easily fabricate one yourself.
> 
> It helps to have a way to put a marker or two on the sweep signal.  Most of our sweep generators had built in crystal oscillators to provide a marker function and it would make sense to use that method if you do a lot of work with the same IF frequency.  If you have a counter, you could probably build a couple of non-crystal controlled oscillators and check them occasionally for accuracy when you are making the final adjustments to the bandwidth.
> 
> Please keep us up to date on further progress with the HBR.
> 
> 73,
> Ed
> WB9RMA
> 
> 
> -----Original Message-----
> From: Whitebear1122 <whitebear1122 at comcast.net>
> To: HBR Receiver List <hbr at mailman.qth.net>
> Sent: Thu, Jul 11, 2019 8:15 pm
> Subject: [HBR] My New HBR-13 Running FB on 40m CW
> 
> I’ve been listening every night to 40m cw on my HBR-13L and it is such a joy to listen to signals from a radio that I built myself.  I’ve been wanting to build my own receiver since 1966.  I am actually shocked that I pulled this off considering it was the first radio project that I’ve ever built.
> 
> Tonight I was experimenting with the 100 KC IF transformer coupling with those ARC5 military IF transformers.  Initially I was running them with maximum coupling, signals were really loud, and the bandwidth really wide.  Tonight I minimized coupling on all 4 IF’s and it did narrow up the bandwidth quite a bit.  I think there is plenty of gain in the regenerative IF’s to overcome the lighter coupling.  I wish I had a spectrum analyzer with tracking generator and I could see the change in bandwidth depending on coupling.  I have been eyeballing that Rigol DS815 spectrum analyzer…. it would have helped my initial troubleshooting quite a bit.  I am planning on building a CW/SSB transmitter next and a spectrum analyzer would be a big help.
> 
> Tonight I was reading the HBR-13 Notes from the HBR website.  The first time I read them not much registered.  This time everything registered.  I really had to build it to understand
> 
> I still have to learn how to adjust the BFO variable caps and coil better.  I thought I had it tuned tonight but it was clearly way off.  I better go back to the HBR-16 article and re-read that.
> 
> I’m still having trouble with the S-meter and will replace it this weekend and see if that makes a difference.
> 
> I don’t have the radio in a cabinet yet.  I have two commercial cabinets to pick from.  One is a Hallicrafters cabinet that would accept the rack mount., and the other is a cabinet from an old commercial oscillator.  I plan to bring them in from the garage rafter storage and see if it’s something I want to use.  Otherwise I might try building a cabinet like K4CHE did, a minimal cabinet built directly up to the chassis and doesn’t waste an inch of space.
> 
> Just curious if there are many HBR folks on this list anymore.  Anyone building an HBR?
> 
> 73, Scott WA9WFA
> 
> 
> 
> 
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-- 
bark less - wag more