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Will

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Reply with quote  #1 
Anyone know anything about a Channel Master 6785 Polarizer Plus Lnb? I have a chance to buy a new one in box. Thanks.
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Will-Johnstown pa
cpsp0

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Reply with quote  #2 
If you can buy a new one, it must be new old stock. I think that Channel Master stopped making that LNB. If I remember right, their website shows just OTA stuff now. I bought a OTA preamp from them not long ago and did not see any FTA stuff listed.



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RickCaylor

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Reply with quote  #3 
Hi Will,

I could not find anything about it either.  See if you can get the specs or any numbers off of the part so maybe you can find out what the Temp. and Stability is.

Depending on how old it is, it may not be worth it, as things have changed so much from the Analog days.  Instead of a 65K, 45K or even a 35K C-LNB, has now been replaced by 20K and 15K and even lower temps so you can lock the current digital channels.  The Norsat Line of LNB's also have very Low Stability which is also key in locking the digital signals.

Rick

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Please e-mail or call me if need to make contact @ rickcaylor@aol.com or Ricks Satellite / 816-228-1801.

Captain_Kurtz

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Reply with quote  #4 
It's not an LNB or an LNBF, it's a feedhorn:

https://www.shoppok.com/morgantown/a,49,120056,Channel-Master-6785-Polarizer-Plus-Antenna-Feed-for-C-Band----150.htm?utm_source=ClazMisc&utm_medium=feed&utm_campaign=global&trmsource=clazoutfeed

Channel_Master_6785_Polarizer_Plus_Anten_5c0f17aad5c10.jpg 

Captain_Kurtz

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Reply with quote  #5 
Chaparral equivalent, new from Rick:

C-Band Polarotor Adjustable Feed with New Servo Motor
Part # - Chaparral - PR 1 E

http://www.rickssatelliteusa.com/rickssatellitefeedhorns.htm#
Captain_Kurtz

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Reply with quote  #6 
BTW, at first I thought he was talking about something like the

California Amplifier C-Band LNBF 31477

"pulse switched" LNBF. It's an LNBF that has a wire that you connect to the Pulse line from the receiver that would normally go to the servo motor, to select polarity. No servo motor or other moving parts - all done electronically.

There are two sellers on ebay right now with NOS units for sale.

A neat idea for its time, but I would have to think those are functionally obsolete, because don't all modern digital receivers support voltage switching to select polarity?
And who wants to use an analog receiver to both move the dish *and* select polarity?

However, if you can find a "normal" voltage-switched Cal Amp LNBF from that era, they are practically worth their weight in gold, and will run rings around modern Chinese LNBFs (sorry for the pun).

I suppose you could use the Cal Amp 31477 with a Titanium ASC1 positioner, since it supports servo motors.
Will

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Posts: 176
Reply with quote  #7 
Thanks for all the replies. I have 3 c band dishes in use here. A 12 ft. Janeil dark star with a modern lnb. A 10 ft. and 8ft. with servo switching. Also, shoe box full cal amp and other lnb's. Some of these lnb's work good with my servo set up. I like the ability to be able to skew. I have been able to get weak signals via skew control that otherwise would not get without it. I actually found this item for $50. I will offer him less. Might be worth getting in current setup? Btw Rick, I bought a Ku dish with motor from you years ago. When you were on "Power Hour" show aka late Joyce Riley show, you gave a fta system away to my disabled veteran friend. I set it up for him on Galaxy 19. You were also so helpful with me when I was setting my first ku dish. Thank you again for a wonderful forum.
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RickCaylor

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Reply with quote  #8 
Hi Will,

Thanks for the kind words and trip down memory lane with Joyce Riley.  Very special lady who helped save my live a few years back when colon ruptured from dealing with the stress from the murder trail for the Illegal Immigrant that murdered my Mother and Father in their Bible Store in 2004.

We had many Great Moments in Radio History on the Radio with Joyce.  As I would say on the air, "Let's put the Receiver on The Power Hour and Break Off the Knob!"  She was always good at laughing at my corn ball jokes as well, Like, where did the Peg Leg Pirate go for Breakfast???  Well... of course... IHOP!

The biggest problem with the older LNB's is the higher temperature.  You should have a 20K or lower for good consistent Digital Locks with today's signals.  I have so many older higher temp units that are just drawing dust now, that I will never go back to.  Nothing wrong with experimenting and testing things out and seeing.  That is how we all learn.

The forum is what it is because of all of the Great People that Participate from all walks of life and backgrounds.  While we may not all agree on many different topics and things in life, this forum allows folks that share a passion or interest in this hobby to gather and share information in a friendly and informative way and we are thrilled that you have joined us here.

Rick

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It's Another Great Day to Be Alive! Keep Your Eyes on the Sky!
Please e-mail or call me if need to make contact @ rickcaylor@aol.com or Ricks Satellite / 816-228-1801.

RickCaylor

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Reply with quote  #9 
Captain Kurtz,

Thanks for the info on the Feed, as I see now that it is a feed horn and not an LNBF.  So, yes you could use this and add a good LNB and still run a servo motor.  I have seen some of these years ago when we did a lot of service calls and did not care for them as much as I did for the Chaparral units, but they did perform fine.

If you could get a Dual C-Band Ortho Mode feed horn and 2 LNB's and eliminate the Servo Motor, you would get a stronger signal, but it does require getting it skewed perfectly when mounting on the dish and of course there is no controlling the polarity from inside, like you can do now with a servo motor.  We are currently still out of stock of the Chaparral Dual C Feeds, but they are finally getting some more built and should have some back in stock in about a month.

Thanks,

Rick

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It's Another Great Day to Be Alive! Keep Your Eyes on the Sky!
Please e-mail or call me if need to make contact @ rickcaylor@aol.com or Ricks Satellite / 816-228-1801.

Captain_Kurtz

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Reply with quote  #10 
Hello Rick -

I'm of course with you 100% on the C-band ortho feed with two LNBs, but since Will seems to be committed to a skewable feed, I also agree with you completely that the modern LNBs (not be confused with modern LNBFs !!) are vastly superior to older models, and the Norsat 5150F that you sell:

http://www.rickssatelliteusa.com/rickssatellitelnblnbf.htm

is an ideal LNB for C-band for what we are doing here on this forum (video and some audio feeds) and your price of $107.50 shipped, with your reputation and service behind it, is an exceptional deal, and what I recommend whether he buys the Channel Master 6785, or gets something newer. IMO, the LNB will have a much bigger impact on performance than the feedhorn, given the need for LNB stability and low phase noise in the age of digital. I would keep the shoe box full of older LNBs as spares.

I am confident that if he buys that NOS CM 6785 feedhorn (or a new Chaparral PR1E from you) and mounts a Norsat 5150F on it, and puts that combination on his 12' Janeil dark star dish, he will see a remarkable improvement over the "modern" LNBF he has on it now. (An ortho feed with two 5150s would of course be better yet.)

Finally, maybe it doesn't get said often enough, but never forget how much all of us appreciate what you do for this hobby, and that we are all here for you.
Will

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Posts: 176
Reply with quote  #11 
I am using a Norsat on the 8 ft. Unimesh. Actually, it gets almost all the Dvb-s2 signals that I see posted. My 10 ft. Sami is used for South America satellite's. 43.1, 40.0, etc. All my C & Ku dishes are planted carefully due to trees issue's. Neighbor next to me does not even watch me anymore. I go out so many times I play with dishes, he figure's normal day at my humble dwelling.
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