[Milsurplus] Milsurplus Digest, Vol 73, Issue 2: TCS receiver suffers

[Henry Mei'l's]

How does it suffer - is it because loading is done int the TCS transmitter 
and not via the exteranl loading coild - thus not matching the antenna to 
the receiver ?

Henry Meils OZ1UF, Cph.
----- Original Message ----- 
From: <milsurplus-request at mailman.qth.net>
To: <milsurplus at mailman.qth.net>
Sent: Saturday, May 01, 2010 6:00 PM
Subject: Milsurplus Digest, Vol 73, Issue 2


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> Today's Topics:
>
>   1. Re: TCS loading coils (WA5CAB at cs.com)
>   2. TCS antenna loading coil (Robert Flory)
>   3. Re: Official Mod Described (C.Whitaker)
>   4. Re: TCS loading coils (B Smith)
>   5. Small arms question (Rob Flory)
>   6. GRT-21/23 (Glenn Little WB4UIV)
>   7. University UL-8217 Microphones Available (Steve Hilsz)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 1 May 2010 01:27:48 EDT
> From: WA5CAB at cs.com
> Subject: Re: [Milsurplus] TCS loading coils
> To: w8au at sssnet.com, milsurplus at mailman.qth.net
> Message-ID: <55f2f.666ae376.390d15d4 at cs.com>
> Content-Type: text/plain; charset="US-ASCII"
>
> OK.  It took about two hours in the shack to check all of this, first
> dismounting and disassembling the 47205 Loading Coil and then the same 
> with the
> transmitter,  The RMCS is correct in that Switch Position 6 is minimum
> inductance in the 47205 External Loading Coil.  In my defense, I normally 
> keep my
> TCS-14 transmitter tuned up on 3885 and connected to the 45' wire.  A few
> weeks ago I needed the wire for something else but needed the TCS too 
> (local
> signal) and basically loaded it up into the loading coil and forgot I had
> done it.  I ran out to the shack, saw the switch set to 0, and came back 
> in and
> wrote the previous.
>
> However, on the internal rotary inductor, I didn't say max what or min
> what.  And in practice it wouldn't matter, regardless of what I was 
> thinking
> when I wrote it.  Crank it from lock to lock key down.  If you don't get 
> an RF
> Ammeter reading, unkey and go to the next step on the external coil and 
> try
> again.  Perry is correct of course in that 43 on the rotary inductor dial 
> is
> minimum inductance and 0 is max.
>
> Something sorta good did come out of this though, not that it is of major
> international importance.  NAVSHIPS 900,291 is the final revision manual 
> on
> the TCS-7, 9, 10. 11 and 12.  Figure 97 is the drawing on the 47205. 
> There
> are three errors on it.  The front view drawing shows the switch at 
> Position
> 3.  Normally, one would expect all the other drawings to be consistant. 
> The
> Electrical Circuit drawing shows it in Position 4.  Section A-A shows it 
> in
> Position 2.  And Section B-B incorrectly shows which terminals the wires
> from the coil go to.  The terminal on the right side of the switch, shown 
> as
> unused, actually connects to the right end of the coil and the right-hand
> front panel post.  The rest of the wires also need to move one terminal to 
> the
> right, leaving two unused on the left side of the switch.  Now I know why
> that drawing always bothered me.  It never seemed to make sense.  And it
> doesn't.  I'm not sure that with the TIF editor tools I have I can fix it 
> neatly.
> So I added correction comments for future reprints.  Anyone who has the
> manual, whether from me or an original, should as the typical Navy 
> Temporary
> Change Notice might say, make pen and ink corrections as indicated above. 
> I
> have not yet checked whether the same or a similar drawing is in the thin
> Preliminary manuals that were done on the TCS-12. 13, 14 and 15 and if so
> whether it has the same error.  If you have one of those manuals and they 
> have a
> similar drawing and the Electrical Circuit diagram shows switch wipers
> going to coil terminals numbered 2 and 4 and the front panel drawing shows 
> the
> knob pointed at 3, then they are also wrong.
>
> In a message dated 4/30/2010 8:30:06 PM Central Daylight Time,
> w8au at sssnet.com writes:
>> At 05:39 PM 4/30/2010, WA5CAB at cs.com wrote:
>> >I suspect a lot of RM's when tuning the transmitter, instead of
>> >turning the external loading
>> >coil to 0 (minimum inductance) and running the internal loading coil to
>> >max, then click the external to coil and go back to min on the
>> >internal, and so
>> >forth, which is the proper way to do it if you haven't a clue where the
>> two
>> >controls need to be, would first turn the external coil up until an
>> ammeter
>> >reading showed up and then fine tune it with the variable.  The
>> transmitter
>> >really doesn't care.  And it's quicker.  But the receiver suffers.
>>
>> Interesting.... all of the TCS sets I've used, including my own have the
>> minimum inductance at the high number end, not zero.  Also the external
>> loading coil is minimum L or bypass at position 6, not 0.
>>
>> Always thought that was odd, but I adapted to it.:-)
>>
>> (no I wasn't standing on my head when tuning them)
>>
>> Perry w8au
>>
>
> Robert & Susan Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
>
>
> ------------------------------
>
> Message: 2
> Date: Sat, 1 May 2010 05:16:01 -0400
> From: "Robert Flory" <robandpj at earthlink.net>
> Subject: [Milsurplus] TCS antenna loading coil
> To: "milsurplus" <milsurplus at mailman.qth.net>
> Message-ID: <410-220105619161859 at earthlink.net>
> Content-Type: text/plain; charset=US-ASCII
>
> The external loading coil gets pretty useful with short antennas at the 
> low end of the frequency range.  With a 12" whip on my automobile, I could 
> not tune my TCS transmitter at 3.5Mc.  3.9Mc was ok.  Even with the 
> 30-foot whip found on many vessels, the loading coil would come into play 
> at 2Mc.
>
> RF
>
> ------------------------------
>
> Message: 3
> Date: Sat, 01 May 2010 07:49:35 -0400
> From: "C.Whitaker" <whitaker at pa.net>
> Subject: Re: [Milsurplus] Official Mod Described
> To: "milsurplus at mailman.qth.net" <milsurplus at mailman.qth.net>
> Message-ID: <4BDC154F.8050008 at pa.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> de WB2CPN
> Some equipment was modified more than others.
> AF had a thing called the Modification Work Order,
> MWO, with a number similiar to the T.O. number.
> You might find that stenciled on the equipment.
> The driving force was the Unsatisfactory Report.
> In many cases you'll find equipment modified on a
> local basis.  Like me putting a BC-610 on the
> broadcast band.   Lots of times the equipment would
> be changed at the factory,  and a letter suffix assigned.
> Anytime you see a receiver that got up to the "Q"
> version, it has been the route.  And Robert may have
> thought about this,  but when any equipment had
> multiple manufacturers,  each model could be slightly
> different to avoid patent problems or the availibility of
> components.
> 73  Clete
>
>
>
>
>
>
> ------------------------------
>
> Message: 4
> Date: Sat, 1 May 2010 08:55:59 -0400 (Eastern Daylight Time)
> From: "B Smith" <smithab11 at comcast.net>
> Subject: Re: [Milsurplus] TCS loading coils
> To: "Milsurplus" <milsurplus at mailman.qth.net>
> Message-ID: <4BDC24DC.0000A1.03100 at DELL560>
> Content-Type: Text/Plain;  charset="iso-8859-1"
>
> We have been down this road before- - - but anyway on my two TCS
> transmitters, on the CIH-52245-A the near end of the loading coil was
> attached to the switch S-103 on the wiper. On my COL 52245 the "far end" 
> of
> the Loading coil was connected to the wiper on S-103.
>
> Breck k4che
>
>
> ------------------------------
>
> Message: 5
> Date: Sat, 1 May 2010 09:40:36 -0400 (EDT)
> From: Rob Flory <robandpj at earthlink.net>
> Subject: [Milsurplus] Small arms question
> To: milsurplus <milsurplus at mailman.qth.net>
> Message-ID:
> <18852098.1272721236844.JavaMail.root at wamui-junio.atl.sa.earthlink.net>
>
> Content-Type: text/plain; charset=UTF-8
>
> Different kind of milsurplus....
>
> Can someone give me the dimensions of a clip for an M1911 .45 cal ?  I 
> want to make some blocks to fill an ammo pouch for a living history 
> representation of WWII US Marine.
>
> RF
>
>
> ------------------------------
>
> Message: 6
> Date: Sat, 01 May 2010 10:12:19 -0400
> From: Glenn Little WB4UIV <glennmaillist at bellsouth.net>
> Subject: [Milsurplus] GRT-21/23
> To: Milsurplus at mailman.qth.net
> Message-ID: <6.2.3.4.2.20100501095711.0340d370 at mail.bellsouth.net>
> Content-Type: text/plain; charset="us-ascii"; format=flowed
>
> I have a module that I got at a hamfest.
> It is ITT assy 8004890G1.
> It is a Driver/Power Amplifier, RF.
> Can anyone verify that this is part of the GRT-21 or GRT-23 transmitter?
> These only put out 10 Watts.
> This amplifier looks like it is capable of much more with the proper 
> heatsink.
> The output modules (3) are assy number 8004892G1 and each have two RF
> power transistors.
> The transistors are TRW PT6702.
> The transistors have a date code of 7451.
> The PA modules look like this
> http://www.bpbsurplus.com/lc/cart.php?target=product&product_id=16983&category_id=256
>
> Google just finds voltage regulators and people that want you to get
> a quote for the transistors.
>
> Any help as to what this came from and the device ratings greatly 
> appreciated.
>
> 73
> Glenn
> WB4UIV
>
>
>
>
>
> ------------------------------
>
> Message: 7
> Date: Sat, 1 May 2010 08:59:40 -0700
> From: "Steve Hilsz" <jydsk at tds.net>
> Subject: [Milsurplus] University UL-8217 Microphones Available
> To: "milsurplus" <milsurplus at mailman.qth.net>
> Message-ID: <7CFD52DA2303414BBAF443BE291F2936 at steve>
> Content-Type: text/plain; charset="iso-8859-1"
>
> University Loudspeakers manufactured some decent hand-held microphones and 
> I have some New Old Stock UL-8217 Dynamic Microphones available. The 
> frequency response is 100 to 9000 HZ at 25,000 Ohms impedance. The mics 
> are equipped with coil cords that are 14 inches when retracted and six 
> feet if you yank hard enough. The cords are terminated in wire stubs, no 
> connectors. These are nice push-to-talk mics for vintage equipment and are 
> priced at $12.50 each plus postage. See them at 
> http://phonesurplus.com/ul8217.html
>
> When ordering, send your address and I'll compute the exact shipping 
> charges.
>
> Steve Hilsz
> jydsk at tds.net
>
>
> ------------------------------
>
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> End of Milsurplus Digest, Vol 73, Issue 2
> *****************************************


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