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 11 
 on: Today at 06:07:31 PM 
Started by AE4X - Last post by AA4PB
"So what's the difference between two buildings fed off different transformers, and 2 separate homes?"

The two buildings have CATV, phones, and alarm wiring running between them. I expect that the bonding would have been required anyway because the two buildings are next to each other, on the same property, and had the same owner so the inspector would assume that other wiring might be added between them in the future.


 12 
 on: Today at 06:04:13 PM 
Started by K2OWK - Last post by K2OWK
WN2C, Excellent article and repair instructions. It would take a lot of patience, but looks doable. If the cable I ordered does not work I will try the technique, and see if I can repair the original one.

Thanks for the info.

73s

K2OWK

 13 
 on: Today at 06:02:20 PM 
Started by KK6LRM - Last post by KK6LRM
Hi all,
I'm hoping someone out there can give me a little help.
I'm redoing a Collins 30L-1 amp. I have just about everything done.
The only thing left to do is "adjust" the  power switch.
Apparently it was hit and moved to the side, so it rubs against the front panel on one side.
It functions just fine. Everything I've been able to find says removing the front panel is a pain.
I have all tools necessary and am pretty good at working on things radio.
I'd like someone to give me a play by play of what is necessary to remove the front panel to straighten the switch.
Thanks very much in advance.

 14 
 on: Today at 06:00:31 PM 
Started by PA1ZP - Last post by AA4N
Suddenly, my key collection seems incomplete   Angry

 15 
 on: Today at 05:58:51 PM 
Started by W8JX - Last post by W8JX
The Chevy Volt uploads performance data via satellite every time you drive it. You can review electric and fuel consumption for as long as you own it. GM uses telemetry to tweak cars software as car is totally software driven/controlled. Car will maintain cruise control speed within 1mph uphill, level or downhill due to sophistication of software control. (it well apply regenerative braking going down hill if needed)  My daughter has a Subaru that uses two cameras to watch traffic and auto apply brakes if needed. All this and more is possible because Technology is getting cheaper and faster allowing more complex algorithms to be done quicker too. Sate with new laptops and tablets.

 16 
 on: Today at 05:45:41 PM 
Started by 9A5BDP - Last post by VK2TIL
I agree with the other replies.

The 2N3866 is an excellent post-mixer amplifier; with Ic of 40mA or more it has very good IP3 performance.

I think that you use the term "strong" to mean high-gain; I and some others use "strong" to describe an amplifier with good IP3.

The post-mixer amplifier is often followed by an attenuator of, perhaps, 3 to 6 dB; impedance match to the filter is important to preserve its response and an attenuator makes the impedance "seen" by the filter resistive and constant.

For a discussion of post-filter IF amplification techniques I recommend this paper;

http://www.ka7exm.net/hycas/hycas_200712_qst.pdf


 17 
 on: Today at 05:43:37 PM 
Started by K1CJS - Last post by W4KYR
Someone is counterfeiting a $30 radio?

 18 
 on: Today at 05:42:52 PM 
Started by AE4X - Last post by N9DG
I don't think you are permitted to have a separate ground on the sub-panel unless it is bonded back to the main panel ground. We had two buildings that were fed from different pole transformers and they still make us bond the two building grounds together.


So what's the difference between two buildings fed off different transformers, and 2 separate homes? 2 adjacent homes don't have to be bonded. Now I suppose if you had other wiring going back and forth (CATV, phone, etc) between buildings - but that's different.

In my case I'm feeding the detached garage from my house service entrance panel - so I get that. That was part of the problem - the quoting electrician (actually my wife did this without asking me!) said that the garage could be grounded separately. And I didn't believe him!

In NEC 2005 it was still permissible to have a separately grounded sub-panel in a detached building like a garage IF there were NO other conductive paths between the two buildings (phone lines, coax cables, metal water lines, etc.). In NEC 2008 it was changed that the sub panel in the second building in addition to having its own ground rod(s) must also be bonded to the main panel with a ground wire (4 wire system). I'd be surprised if there are many jurisdictions left anywhere that are still using NEC 2005 as their basis. So I'd get another quote from another electrician  Wink..

The other thing I've thought of is to have two operating positions - a "primary" position in the detached building for contesting etc, and a "secondary" position in the house. Maybe with a fat run of heliax between them. But my understanding is I still have to bond the two positions together and to the service entrance. So that complicates things even more.

Presumably the two stations would share or swap antennas, or have an interconnect feedline(s) as you noted.. For that reason alone I would want to bond the grounding systems together between both locations, this is true whether even if they are fed by separate electrical services or not. It has as much to do with the lightning protection aspects of the whole system as it does AC power system safety.

 19 
 on: Today at 05:36:22 PM 
Started by KC9ZNC - Last post by KC9ZNC
I'll try and post pic later tonight

 20 
 on: Today at 05:30:56 PM 
Started by K5USF - Last post by WT8E
My RS35A developed a very noticable hum, its an older unit but works FB. My problem was quickly found to be the top cover vibrating  on the front case. I cut a small piece of corrugated cardboard and raised the cover up, slipped in the cardboard and problem solved.

The cooling fan I have blowing on the heat sink makes more noise that the power supply.

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