Opinion: Worth making a AD DB8e; have DB4e already - Canadian TV, Computing and Home Theatre Forums

 
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post #1 of 4 (permalink) Old 2017-09-17, 10:30 PM Thread Starter
 
Join Date: Jan 2011
Location: Newmarket - North of Toronto
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Opinion: Worth making a AD DB8e; have DB4e already

Currently I have a AD DB4e that I'm not using. What are your opinions on converting it into a AD DB8e. I think I got the DB4e about 2-3 years ago before the introduction of the DB8e. I don't think AD made any changes to the current DB4e since. Currently I'm using a no name brand (8 bay) in the attic... so I can refuse that frame. Is it worth trying to get another DB4e? Or bite the bullet and sell the DB4e at a lost and get a DB8e? Thanks.
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post #2 of 4 (permalink) Old 2017-09-25, 08:01 PM
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Sure.... if you up to the task of modifying one product to fit another's frame, WHY NOT....it's certainly worth the savings.....

Since I've done quite a bit of Antenna Modeling (incl. Horiz. Stacked), I KNOW that the [Center-to-Center] Horizontal Separation Distance makes a difference....but not much, see Images #1-6 for "somewhat similar" FF4+DAR with RFC (RF Combiner):
Horiz-Stack 2xFF4 + DoubleAng Refl - RFC

You might want to send a PM to ADTECH to see what model number RF Combiner they use in the DB-8e and how much LOSS it has....they MIGHT have carefully selected it to be lower than most (typ. 0.5 to 1.5 dB).

I prefer using the ZERO-LOSS HHH (Holl_ands Horizontal Harness), but since I don't have measurements or an Antenna Model for DB-4e, I can't calculate the Optimized Dimensions......sorry....
http://imageevent.com/holl_ands/stac...blanglereflhhh

Antenna Simulations, Overload Calculations, etc: http://imageevent.com/holl_ands
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post #3 of 4 (permalink) Old 2017-09-27, 02:00 PM
 
Join Date: Oct 2010
Location: Antennas Direct Tech Support - St Louis
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Quote:
I don't think AD made any changes to the current DB4e since.
Just a minor change to the balun housing to improve mechanical reliability.

Quote:
Is it worth trying to get another DB4e? Or bite the bullet and sell the DB4e at a lost and get a DB8e? Thanks.
The DB8e requires a center-to-center separation of 70 cm between the two DB4e panels. I have no idea what the size of your current antenna's frame might be, but, if you plan to use the resulting assembly for an attic mount, simply attaching the DB4e panels to a 1x4 or 2x4 piece of wood at the correct distance would emulate the factory spacing of the two halves of a DB8e (sans adjustability, of course). The individual panels are combined using two 71.5 cm lengths of RG6 coax fed into the "signal combiner" which is a reversed two port splitter with pretty low insertion loss and good isolation between the two ports used as inputs. You can produce similar results with almost any decent quality splitter that is available to you locally.

Antennas Direct Tech Support
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post #4 of 4 (permalink) Old 2017-10-01, 01:12 PM Thread Starter
 
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Much thanks for all of the replies.
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