[ARC5] ARC5 Digest, Vol 138, Issue 9
alexseddio at gmail.com
alexseddio at gmail.com
Sun Jul 19 01:08:30 EDT 2015
Good night then...
Sent from my iPhone
> On Jul 18, 2015, at 8:14 PM, arc5-request at mailman.qth.net wrote:
>
> Send ARC5 mailing list submissions to
> arc5 at mailman.qth.net
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://mailman.qth.net/mailman/listinfo/arc5
> or, via email, send a message with subject or body 'help' to
> arc5-request at mailman.qth.net
>
> You can reach the person managing the list at
> arc5-owner at mailman.qth.net
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of ARC5 digest..."
>
>
> Today's Topics:
>
> 1. Off topic - OS-8 (Kenneth G. Gordon)
> 2. AZON and RAZON Control Box (Robert Eleazer)
> 3. SCR274 field test (J Mcvey via ARC5)
> 4. Re: SCR274 field test (Brian)
> 5. Re: SCR274 field test (Roy Morgan)
> 6. Re: SCR274 field test (Kenneth G. Gordon)
> 7. Re: SCR274 field test (Kenneth G. Gordon)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 18 Jul 2015 13:34:54 -0700
> From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
> To: ARC5 at mailman.qth.net
> Subject: [ARC5] Off topic - OS-8
> Message-ID: <55AAB86E.27526.3D67D43E at kgordon2006.frontier.com>
> Content-Type: text/plain; charset=US-ASCII
>
> In my stash of "stuff" I found two OS-8s: an OS-8 and an OS-8B.
>
> I have manuals for both units.
>
> Both "work" after a fashion, but the trace is skewed and not a straight-line.
>
> I suspect the main problem is in the power supply section.
>
> Looking at the schematics, I see that there are three diodes, all selenium
> rectifier types. It has been my experience that selenium-diodes become,
> after a long while, not so much a diode, but a dual-resistor which shows a bit
> less conductivity in one direction than another.
>
> Therefore, I plan to replace them with modern diodes and a series resistor to
> keep the voltage closer to the original voltage.
>
> What is the group's experience with OS-8(X)?
>
> Ken W7EKB
>
>
> ------------------------------
>
> Message: 2
> Date: Sat, 18 Jul 2015 18:43:01 -0400
> From: "Robert Eleazer" <releazer at earthlink.net>
> To: <arc5 at mailman.qth.net>
> Subject: [ARC5] AZON and RAZON Control Box
> Message-ID: <463F559672CA4EB5819BADCEED2B5439 at DH26DQ31>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Ebay item: 171857913480
>
> Wayne
>
>
> ------------------------------
>
> Message: 3
> Date: Sun, 19 Jul 2015 00:28:46 +0000 (UTC)
> From: J Mcvey via ARC5 <arc5 at mailman.qth.net>
> To: "ARC5 at mailman.qth.net" <ARC5 at mailman.qth.net>
> Subject: [ARC5] SCR274 field test
> Message-ID:
> <130647969.332163.1437265726287.JavaMail.yahoo at mail.yahoo.com>
> Content-Type: text/plain; charset=UTF-8
>
> I was hoping that I could run the dual rx/tx setup off of my? jeep battery, but it seems it needs a stiffer deep cycle type to keep up with the load in transmit. The jeep batter sagged badly and for that matter so did the deep cycle battery (11v under full load), but it was sufficient to keep things working.
> I think i'm missing something about the nature of dynamotors and batteries ...
> With the two transmitter filaments ( 4X 1625) @ 2a and the rx pulling about 2.5a, that's a constant 4.5a, add the dyno in stanby which bring the the total cw break-in receive mode 7.5a.
> The dyno says 9a @ 12V continuous duty for 440v @ 200 ma .That should be a max of 16.5a a key down. So how can 16.5 amps draw a 130AH battery down to 11v from it's fully charged resting voltage of 12.6v ? ( it recovers on key up)
> When I was using a SMPS, it sounded good, now I've got some chirp due to power droop.What say you experts?
> BTW, I was doing this in "original spec" using a very short wire antenna of about 35 feet on 80 meters in NVIS config. Loads right up at about 50% inductance with coupling also about 50%. I like to stick a NE-2 ( leads shorted together) in the antenna clip on the bc-442 to see how bright I can make it glow. It tracks well with antenna current.
>
>
> ------------------------------
>
> Message: 4
> Date: Sun, 19 Jul 2015 11:26:18 +1000
> From: "Brian" <brianclarke01 at optusnet.com.au>
> To: "J Mcvey" <ac2eu at yahoo.com>, <ARC5 at mailman.qth.net>
> Subject: Re: [ARC5] SCR274 field test
> Message-ID: <E401C7712F2146F9AF913A61FD8B5B44 at BrianPC>
> Content-Type: text/plain; format=flowed; charset="utf-8";
> reply-type=original
>
> Hello J,
>
> You are looking at only the steady-state current. Elsewhere in the manual
> you will find the start-up current listed. You need to allow for 120 A
> start-up on the transmit dynamotor.
>
> 73 de Brian, VK2GCE.
>
> On Sunday, July 19, 2015 10:28 AM , you said:
>
> I was hoping that I could run the dual rx/tx setup off of my jeep battery,
> but it seems it needs a stiffer deep cycle type to keep up with the load in
> transmit. The jeep batter sagged badly and for that matter so did the deep
> cycle battery (11v under full load), but it was sufficient to keep things
> working.
> I think i'm missing something about the nature of dynamotors and batteries
> ...
> With the two transmitter filaments ( 4X 1625) @ 2a and the rx pulling about
> 2.5a, that's a constant 4.5a, add the dyno in stanby which bring the the
> total cw break-in receive mode 7.5a.
> The dyno says 9a @ 12V continuous duty for 440v @ 200 ma .That should be a
> max of 16.5a a key down. So how can 16.5 amps draw a 130AH battery down to
> 11v from it's fully charged resting voltage of 12.6v ? ( it recovers on key
> up)
> When I was using a SMPS, it sounded good, now I've got some chirp due to
> power droop.What say you experts?
> BTW, I was doing this in "original spec" using a very short wire antenna of
> about 35 feet on 80 meters in NVIS config. Loads right up at about 50%
> inductance with coupling also about 50%. I like to stick a NE-2 ( leads
> shorted together) in the antenna clip on the bc-442 to see how bright I can
> make it glow. It tracks well with antenna current.
>
>
>
> ------------------------------
>
> Message: 5
> Date: Sat, 18 Jul 2015 22:04:23 -0400
> From: Roy Morgan <k1lky68 at gmail.com>
> To: J Mcvey <ac2eu at yahoo.com>
> Cc: ARC-5 List <ARC5 at mailman.qth.net>
> Subject: Re: [ARC5] SCR274 field test
> Message-ID: <31F7603E-CF0A-45BE-B08D-2B3B456D24D0 at gmail.com>
> Content-Type: text/plain; charset=windows-1252
>
>
>> On Jul 18, 2015, at 8:28 PM, J Mcvey via ARC5 <arc5 at mailman.qth.net> wrote:
>>
>> ...how can 16.5 amps draw a 130AH battery down to 11v from it's fully charged resting voltage of 12.6v ? ( it recovers on key up)
>
> Note well where you are measuring the voltage. There may well be IR drop in the leads from your battery to the radio - if you are measuring the voltage at the radio, I?d bet on it. And especially so if you are getting the radio supply voltage from somewhere other than the battery terminal itself.
>
> If the wire to the radio does not come off the battery itself (and the connectors are bright and shiny inside) you?ll have voltage drop in the vehicle harness.
>
> Roy]
>
> Roy Morgan
> k1lky68 at gmail.com
> K1LKY Since 1958
>
>
>
> ------------------------------
>
> Message: 6
> Date: Sat, 18 Jul 2015 20:09:50 -0700
> From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
> To: ARC5 at mailman.qth.net
> Subject: Re: [ARC5] SCR274 field test
> Message-ID: <55AB14FE.13614.3ED1695E at kgordon2006.frontier.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
>> On 18 Jul 2015 at 22:04, Roy Morgan wrote:
>>
>> If the wire to the radio does not come off the battery itself (and the
>> connectors are bright and shiny inside) you?ll have voltage drop in the vehicle
>> harness.
>
> Abso-freaking-lootely. If your dynamotor is NOT connected DIRECTLY to the
> battery through at least a #10 stranded wire, you WILL lose voltage via an IR
> drop.
>
> #10 stranded wire is good for 30 amps with minimum drop in conduit.
>
> Personally, if that were my rig, I'd be using something like 3-ought welding
> cable.
>
> Ken W7EKB
>
>
> ------------------------------
>
> Message: 7
> Date: Sat, 18 Jul 2015 20:14:37 -0700
> From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
> To: J Mcvey via ARC5 <arc5 at mailman.qth.net>
> Subject: Re: [ARC5] SCR274 field test
> Message-ID: <55AB161D.1464.3ED5C815 at kgordon2006.frontier.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
>> On 19 Jul 2015 at 0:28, J Mcvey via ARC5 wrote:
>>
>> I was hoping that I could run the dual rx/tx setup off of my? jeep battery, but
>> it seems it needs a stiffer deep cycle type to keep up with the load in
>> transmit.
>
> No. You just need bigger wire and a better connection.
>
>> The jeep battery sagged badly and for that matter so did the deep cycle
>> battery (11v under full load),
>
> I'll bet you're measuring that voltage at the dynamotor...
>
> What is the voltage at the battery?
>
>> but it was sufficient to keep things working. I
>> think i'm missing something about the nature of dynamotors and batteries ...
>> With the two transmitter filaments ( 4X 1625) @ 2a and the rx pulling about
>> 2.5a, that's a constant 4.5a, add the dyno in stanby which bring the the total
>> cw break-in receive mode 7.5a. The dyno says 9a @ 12V continuous duty for 440v @
>> 200 ma .That should be a max of 16.5a a key down.
>
> Yes, but that is after the dynamotor is already up to speed.
>
>> So how can 16.5 amps draw a
>> 130AH battery down to 11v from it's fully charged resting voltage of 12.6v ?
>
> IR drop in the cables or connectors.
>
> Use bigger wire and better connectors. I would suggest 3-ought welding
> cable.
>
> Ken W7EKB
>
>
> ------------------------------
>
> Subject: Digest Footer
>
> _______________________________________________
> ARC5 mailing list
> ARC5 at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/arc5
>
>
> ------------------------------
>
> End of ARC5 Digest, Vol 138, Issue 9
> ************************************
More information about the ARC5
mailing list