[Heath] LMO rebuilding....did I mess it up?
Guy Giacopuzzi
gggdds at js-net.com
Sun Mar 13 19:48:34 EDT 2016
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
On 3/13/2016 3:29 PM, G3OOU at aol.com wrote:
> 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.
> 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 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>
>> <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>
>> <http://www.qsl.net/g3oou>
>> <http://www.qsl.net/g3oou>
>> <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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