[Heath] LMO rebuilding....did I mess it up?
Guy Giacopuzzi
gggdds at js-net.com
Mon Mar 14 08:54:39 EDT 2016
Well, it's not quite that easy...I don't know if this LMO is TRW or
not...no markings...and it had the "warble" problem Glen Zook has talked
about....so I had to do the "braid" mod and getting that on and off
isn't easy...then you have to "cock" the spring loaded anti-backlash
gear and get it back onto the worm drive...anyway...I did all of that
and I'll have it back into the 101' over the weekend....I guess you guys
with TRW LMO's only have to lube them again, no braid, right?
What/where do you get your grease? I assume it's conductive, right?
Guy,
WA6OQQ
On 3/14/2016 1:47 AM, G3OOU at aol.com wrote:
> Hi Guy
> Simple solution, just slacken the LMO tuning capacitor shaft to the
> worm gear, rotate it 180 degrees and retighten.
> 73
> /
> Bob/
> Bob F Burns G3OOU, G-QRP 6907, @BobFBurns
> Crystal Palace Radio & Electronics Club: www.g3oou.co.uk
> <http://www.g3oou.co.uk/>
> Technical web site: www.qsl.net/g3oou
> <http://www.qsl.net/g3oou>
> In a message dated 13/03/2016 23:49:04 GMT Standard Time,
> gggdds at js-net.com writes:
> <http://www.qsl.net/g3oou>
>
>
>
> It*is* working; it tunes 5.0 to 5.5mhz as tested with my
> counter.....only problem is that 5.0nhz is at the full
> counterclockwise position of the shaft--I set it up backwards!!
> Guy
>
> <http://www.qsl.net/g3oou>
> On 3/13/2016 3:29 PM, <http://www.qsl.net/g3oou>G3OOU at aol.comwrote:
> <http://www.qsl.net/g3oou>
> <http://www.qsl.net/g3oou>
>> Hi Guy
>> I would check the frequency of the LMO output with a frequency
>> counter before doing anything else. It should tune from 5.5 -
>> 5MHz plus a small overlap i.e. it tunes from high to low when the
>> SB101 tunes from low to high.
>> <http://www.qsl.net/g3oou>
>> 73
>> /
>> Bob/
>> Bob F Burns G3OOU, G-QRP 6907, @BobFBurns
>> Crystal Palace Radio & Electronics Club:
>> <http://www.qsl.net/g3oou>www.g3oou.co.uk
>> Technical web site: www.qsl.net/g3oou
>> <http://www.qsl.net/g3oou>
>> In a message dated 13/03/2016 18:26:02 GMT Standard Time,
>> gggdds at js-net.com writes:
>> <http://www.qsl.net/g3oou>
>>
>>
>>
>> Glen, and any other members of the Heathkit listserve,
>>
>> I think I have a problem, and it's not in Houston....I got
>> the 80 band tuned up on my SB-101, so I thought I'd try it on
>> the air..I found an 80 meter LSB group of hams talking ,and
>> having tuned up the 101' into a dummy load, I turned it onto
>> the antenna and called...they came right back and said I had
>> a nice signal...no tuner...I asked "what frequency are you
>> showing?" and he came back "3900khz". Only one problem...I
>> was tuned to 3691khz!! I checked this again on 40
>> meters...same thing...when I transmit a signal using my
>> Elecraft K2 on 7400khz, the 101' is reading (and receiving)
>> it on 7181khz...Did I do something wrong with the LMO? I
>> checked it's range of movement,and with the tuning unit
>> dialed all the way counterclockwise, the variable cap is
>> almost closed; then, five turns to the right and the cap is
>> fully opened, as I recall. I didn't check it on any other
>> bands, but at the moment, it would seem the LMO's output is
>> 219khz too low....right? It's reading 219khz low exactly on
>> both bands..... Help....
>>
>> A bit of history. I know virtually nothing about the history
>> of this 101'....I bought this one, with another 101' and two
>> HP23 series power supplies from a nearby ham for $100. He had
>> bought them from another ham, hoping to get one working one
>> out of the pair. He never had time to delve into either of
>> them....
>>
>> Guy
>> WA6OQQ,
>> On of the hams at Heath
>>
>>
>> On 2/1/2016 1:40 PM, Glen Zook wrote:
>> <http://www.qsl.net/g3oou>
>>> The LMO can be removed without removing the front panel.
>>> You do have to loosen the setscrew on the dial assembly,
>>> unsolder the wires to the LMO, and remove the 4-nuts on the
>>> underside of the chassis.
>>>
>>> Remove the main tuning knob and loosen the large nut on the
>>> panel that holds the shaft. Move the shaft so that the slip
>>> drive is removed from the dial. Then, lift the LMO from the
>>> chassis and away from the dial.
>>>
>>> After making the repairs, put the LMO back in place and
>>> reverse the directions.
>>> Glen, K9STH
>>>
>>> <http://www.qsl.net/g3oou>
>>> Website: <http://www.qsl.net/g3oou>http://k9sth.net
>>>
>>>
>>>
>>> <http://www.qsl.net/g3oou>
>>> ------------------------------------------------------------------------
>>> *From:* Guy Giacopuzzi
>>> <http://www.qsl.net/g3oou><gggdds at js-net.com>
>>> *To:* Glen Zook <http://www.qsl.net/g3oou><gzook at yahoo.com>
>>> *Sent:* Monday, February 1, 2016 2:22 PM
>>> *Subject:* Re: LMO rebuilding....
>>> <http://www.qsl.net/g3oou>
>>>
>>> Glen,
>>> Thanks for your help....I followed some of your advice, and
>>> the advice that I didn't follow came back to bite me.....I
>>> acquired a couple of SB-101's for a song (well, a song plus
>>> $100, but it included two power supplies....)....and I've
>>> been "bringing the 1st one 'back'" so to say....cleaning,
>>> checking, going thru the tune up routine, etc......I rebuilt
>>> the LMO on an SB-101....removed the front panel, etc to get
>>> to it...had to do a lot of general cleaning as the entire
>>> dial assy was all gummed up. I took apart and cleaned the
>>> LMO...lubed it, removed and cleaned the stops, but/I didn't
>>> do the braid thing/......I used a high end light oil for the
>>> lube...from Kroil....I got it on the air last night, loaded
>>> it into a 75 ft long wire w/ no tuner and joined a group at
>>> about 3800kc or so but they kept reporting I was "jumping
>>> all over the place"...as I listened, I heard them, but the
>>> frequency kept changing...or "warbling" as you say. My
>>> signal was plenty powerful, and the group was spread out all
>>> over the California coast up past San Francisco...so the
>>> 6146B's were really kicking, so to say. So, I reread your
>>> email and this time, downloaded the file on LMO rebuilding.
>>> I'm going to attempt removal of the LMO w/o removing the
>>> front panel--can I do that? Maybe I'll have to remove the
>>> "escutcheon" to set the dial on right...Anyway, now I think
>>> I've got to do the braid....I was going to use a bit of
>>> "soldering" or maybe I should say "de-soldering" braid...Is
>>> that ok? Anyway, I should have followed /all/ of your
>>> advice, not just some of it. One other interesting
>>> thing....when I tuned in the stations, my RF gain control
>>> didn't work, and when I looked at it, the diode on the
>>> middle terminal had let go...but wow, did the receiver/have
>>> a lot of gain/. When I hooked it back up, the gain seemed
>>> to back down a bit. I thought I'd play with that just a bit
>>> to see if the control is somehow hurting the overall
>>> receiver gain...
>>> <http://www.qsl.net/g3oou>
>>
>> --
>>
>>
>>
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>> <http://www.qsl.net/g3oou>
>>
>
> --
>
> <http://www.qsl.net/g3oou>
>
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