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DB4 vs Channel Master 4221

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Old 03-04-2010, 11:08 AM   #1
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Default DB4 vs Channel Master 4221

What are your comments about the DB4 vs the CM4221? Which is more sensitive and which has a wider reception area? Thank you.
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Old 03-04-2010, 11:20 AM   #2
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Hello Ray,

Ken Nist has modeled these two antennas (plus others). You can see his modeled gain data here: http://www.hdtvprimer.com/ANTENNAS/comparing.html

Based on Ken's data, the CM4221 has higher net gain than the DB-4. If you click on each antenna (bottom of net gain chart), you can see the modeled beamwidth. The two antennas appear to have similar beamwidth. However, it is important to note that modeled data does not always match up well with field test results. The two are pretty close in performance. Pick one and try it on your roof, looking for the spot which gives you best reception. Location of the mount is critical for success with OTA reception.

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Old 05-12-2010, 06:24 AM   #3
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The DB4 & DB8 have poor matching transformer designs. The 'F' fitting is only held on by solder to the small fragile circuit board within the plastic enclosure which WILL break eventually. Also, the 4221/4228 was a better design when it was made in the US.

The original CM design is still the 'king of the road' if you can find a new one (which I did last year).
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Old 05-12-2010, 07:00 AM   #4
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Originally Posted by videobruce View Post
The DB4 & DB8 have poor matching transformer designs. The 'F' fitting is only held on by solder to the small fragile circuit board within the plastic enclosure which WILL break eventually. Also, the 4221/4228 was a better design when it was made in the US.

The original CM design is still the 'king of the road' if you can find a new one (which I did last year).
With all due respect, the balun PCB in the DB4/8 is extremely efficient on UHF (although it is terrible on VHF). I've been doing some balun testing on a spectrum analyzer w/tracking generator and it's the most efficient on UHF that I've tested so far.

Your point regarding the mechanical weakness is less of a concern than it used to be. The plastic enclosure in which the PCB is enclosed now has a molding to better secure the hex portion of the F-connector. It still has considerable room for improvement, but it is much improved over the original design in which the solder was the only thing that held it together.

FWIW, I have an "original" 4228 around here somewhere. I'll see if I can pull its 6 or 7 year-old balun and see how it has held up to the real world.
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Old 05-12-2010, 09:47 AM   #5
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It might be a good electrical design, but mechanically, it sucks. I'm not familiar with any 'new' design, unless it was in the past year or so. Both baluns on a DB8 instalation that I reinstalled (moved the antenna among other things for someone), broke. The boards both cracked.

Any 4228 I have seen had no balun.
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Old 05-12-2010, 11:22 AM   #6
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If it doesn't have a balun, it cannot be connected to coax...
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Old 05-12-2010, 01:52 PM   #7
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Quote:
Originally Posted by videobruce View Post
... The original CM design is still the 'king of the road' if you can find a new one (which I did last year).
I think there may be a new king - the Kosmic SuperQuad by EscapeVelocity. (Albeit a bit more costly.)
http://cgi.ebay.com/ws/eBayISAPI.dll...m=180499561043

Quote:
If it doesn't have a balun, it cannot be connected to coax...
Can't argue with that.
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Old 05-13-2010, 04:13 AM   #8
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Does anyone here know about of have they tested this antenna?

http://www.partsforhdtv.com/high-gai...14f08583081cad
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Old 05-13-2010, 06:27 AM   #9
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Quote:
If it doesn't have a balun, it cannot be connected to coax...
You were commenting on the balun is separate. Any balun could of been used for testing.
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I think there may be a new king - the Kosmic SuperQuad by EscapeVelocity.
It's a refined 4221. Period. How about a 8 bay version?
Always love when mileage is given for a spec. In the right location and conditions, a coat hanger could receive at that stated distance.
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Last edited by videobruce; 05-13-2010 at 07:09 AM.
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Old 05-23-2010, 09:23 PM   #10
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If you read the feedback on the 4221HD on Amazon you will see the quality isn't like they use to be when they were made in the USA.
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Old 05-23-2010, 09:34 PM   #11
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LovesToWatch: said

Quote:
Does anyone here know about of have they tested this antenna?
That Yagi style antenna might be a little less wide band than what they claim but the price is really cheap enough though.

If you click on the HDTV Antenna link on that site, they have a very reasonable priced 4 bay antenna that looks like much better quality than the Channel Master 4221HD.
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Old 05-26-2010, 01:40 PM   #12
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Ive had a DB4 up now for about 4-5 months. We have had some pretty nasty wind storms and other weather and its holding up pretty well so far. Reception overall is solid and I get my local VHF station perfectly. I also get good reception from the rear of the antenna.

Its not perfect but its a decent buy and will probably serve most users that are within reasonable range to their main towers. I have mine mounted about 1/3 of the way down my roof.
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Old 02-07-2011, 05:40 PM   #13
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Default Broken DB4 Connector? Parts??

Hi,

I found this page searching for a board for my DB4.

I was in the process of installing it for the first time, and in trying to make sure that the UHF connector was tight the solder point broke and it is now useless.

It doesn't look like it can simply be re-soldered.

Does anyone know if it is possible to fix this and where I might find the board with the UHF connector soldered onto it to replace the broken one?

Thanks, very much.

--- John in Ohio
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Old 02-07-2011, 08:03 PM   #14
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Originally Posted by whonew View Post
Hi,

I found this page searching for a board for my DB4.

I was in the process of installing it for the first time, and in trying to make sure that the UHF connector was tight the solder point broke and it is now useless.

It doesn't look like it can simply be re-soldered.

Does anyone know if it is possible to fix this and where I might find the board with the UHF connector soldered onto it to replace the broken one?

Thanks, very much.

--- John in Ohio
Contact the manufacturer. The antenna has a lifetime warranty.
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