[HBR] questions about HBR-11

[Darrell, WA5VGO]

Joe,

I would use them in the same order as the BC-453. The coupling should 
presumably be optimum like that.

The hang AGC circuit can be found on Kee's HBR web site. Check out the 
schematic for the W7QBR improved HBR-16. The only thing I found was that it 
performed much better connected to the IF instead of using the audio. The 
attack was much faster and I got rid of some BFO leakage that was occurring.

One more passing thought. If you plan on using it on the higher bands(say, 
above 20 meters), Going to the Hartley oscillator and the additional gain 
it provides is very worthwhile. On the other hand, if you are only going to 
use it on 20 meters and below, the receiver has more than adequate gain 
without it.

73,
Darrell, WA5VGO






At 01:14 PM 11/18/2004 -0600, you wrote:
>Thanks for the replies!
>
>Follow-up questions for Darrell:
>
>If I use the 85 kc transformers in the HBR in the same order (input to 
>output) as in the BC-453, that should be a pretty safe bet, yes?
>
>Also, could you please point me to the hang AGC info?
>
>Regarding local AM stations, there's one on 1590 that may casue some 
>trouble. We'll just have to see how it goes.
>
>Tnx & 73,
>Joe K9LY
>
>
>
>At 7:55 PM -0600 11/17/04, Darrell, WA5VGO wrote:
>>Joe,
>>
>>No one is jumping on this, so let me throw out a few opinions.
>>
>>1) The IF transformers from a BC453 work very well. Many people have used 
>>them successfully, so you won't be in uncharted waters if you go this route.
>>
>>2)  I see no reason you can't use all three from the same BC453, although 
>>using all input transformers might give you a little better ultimate 
>>selectivity.
>>
>>3) Haven't tried it.
>>
>>4) They are unshielded, just like the photos depict.
>>
>>5) I haven't had this problem although (just as you stated) if you are in 
>>close proximity to one it could be a problem.
>>
>>6) The article does not call for one, but I found that adding one 
>>stiffened up the chassis and made a very significant improvement in 
>>mechanical stability.
>>
>>The only thing I will add is, as I have stated on this reflector before, 
>>the hang AGC makes such a major improvement in the overall performance, I 
>>wouldn't think of building one without it.
>>
>>Maybe some others will get in here and give their opinions.
>>
>>73,
>>Darrell, WA5VGO
>>
>>
>>
>>
>>At 03:44 PM 11/17/2004 -0600, you wrote:
>>>Howdy. I've got a few questions about the HBR-11 that I hope you who've 
>>>already been down this path can answer.
>>>
>>>1) Can I use the relatively large IF transformers (85 kc) from a 
>>>BC453-type receiver in the HBR-11 rather than the smaller 3/4 inch 
>>>transformers originally specified? In other words, was size the main 
>>>reason for using small 3/4 inch transformers in the original HBR-8/11/13 
>>>article?
>>>
>>>2) The HBR-11 uses three transformers in the 100 kc IF. Can the one 
>>>BC453 I've got provide all three transformers or do I need a second 
>>>BC453 to have enough of the right type?
>>>
>>>3) Has anyone made a 30 meter coil set? Are there any birdies or nasty 
>>>image responses when using an HBR-11 on this band?
>>>
>>>4) Pictures of the underside of the HBR-11 show that L4A and L4B (the 
>>>1610 kc IF transformers) do not have shield cans. Is that really how 
>>>they're supposed to be?
>>>
>>>5) Has anyone experienced direct IF pickup of the AM broadcast stations 
>>>that are now found between 1600-1700 kc? (I suppose one's proximity to 
>>>such a station would be the main culprit.)
>>>
>>>6) It seems the original article did not call for a chassis bottom 
>>>cover, is that correct?
>>>
>>>Hoping to build an HBR-11 one of these years.....  ;-)
>>>
>>>73,
>>>Joe K9LY
>>>************************************
>>>Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
>>>construction notes...... via http://www.qsl.net/k5bcq/
>>>Retrieve reflector archived data via 
>>>http://mailman.qth.net/mailman/listinfo/hbr
>>
>>
>>
>>************************************
>>Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
>>construction notes...... via http://www.qsl.net/k5bcq/
>>Retrieve reflector archived data via 
>>http://mailman.qth.net/mailman/listinfo/hbr
>
>************************************
>Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
>construction notes...... via http://www.qsl.net/k5bcq/
>Retrieve reflector archived data via 
>http://mailman.qth.net/mailman/listinfo/hbr
>