[HBR] questions about HBR-11

[Joe LeKostaj]

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