[Hammarlund] Hammarlund Digest, Vol 130, Issue 8

radiomanL radiomanL at verizon.net
Fri Nov 28 17:34:07 EST 2014 

I usually just disconnect the old can and leave it in place , then install 
individual capacitors . they are small enough that one can generally find 
space for then without installing terminal strips . can usually find the 
nearest connection point where the wire that hooks to the cap terminal is 
and solder the replacement there . the old rigs have plenty of space under 
the chassis .

andrew
kd5pnt
----- Original Message ----- 
From: <hammarlund-request at mailman.qth.net>
To: <hammarlund at mailman.qth.net>
Sent: Friday, November 28, 2014 1:01 PM
Subject: Hammarlund Digest, Vol 130, Issue 8


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> Today's Topics:
>
>   1. HQ-180 can capacitor (Robert Sauvan)
>   2. HQ-180 hum in CW mode (Charles Ochs)
>   3. Re: HQ-180 hum in CW mode (barcand at nccray.com)
>   4. Re: HQ-180 can capacitor (Richard Knoppow)
>   5. Re: HQ-180 can capacitor (L L bahr )
>   6. Re: HQ-180 can capacitor (Robert Sauvan)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 28 Nov 2014 07:09:05 -0700
> From: Robert Sauvan <rsauvan at beyondbb.com>
> To: Hammarlund Mail List <hammarlund at mailman.qth.net>
> Subject: [Hammarlund] HQ-180 can capacitor
> Message-ID: <54788201.2070803 at beyondbb.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Hi all,
> I had been working on my HQ-180 replacing this and that and doing a
> complete alignment. It works fine (better than ever) but I still feel I
> have distorted cw signals somewhat. I had posted this previously and
> most pointed to the AVC section of the circuits but I have not located
> anything amiss there.  I am curious to know whether or not the
> possibility of one of the caps in my can capacitor might be causing the
> issue. I always noticed that there was a large electrolytic mounted
> under the chassis that I thought looked a bit out of place. After
> digging into it a bit more, It became obvious it was replacing one of
> the can capacitors. So, this got me to thinking that maybe the can cap
> is starting to slowly fail and therefore possibly this is my issue with
> the distorted cw signals. SSB signals sound good. I have made a bunch of
> resistance and voltage measurements (except at this can cap area) but
> have not found a spot that is looking really bad. So, any ideas?
>
> Thanks-Bob-W0YBS
>
>
> ------------------------------
>
> Message: 2
> Date: Fri, 28 Nov 2014 13:03:59 -0500
> From: Charles Ochs <chuckochs at hotmail.com>
> To: "hammarlund at mailman.qth.net" <hammarlund at mailman.qth.net>
> Subject: [Hammarlund] HQ-180 hum in CW mode
> Message-ID: <BLU178-W344407F66F877571C6B5ABAE7E0 at phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Sounds to me that you are "closing in" on the problem. A failing filter 
> cap will often be more audible as the 60 HZ content of the B+ will beat 
> against the steady tone of a CW signal.Troubleshooting should ALWAYS start 
> with the power supply. Can capacitors should ALWAYS be considered 
> "suspects" and must be carefully eliminated before proceeding onward to 
> other things. Without a healthy power supply, the radio can not be 
> expected to operate properly.Given the age of the HQ-180, it should be 
> assumed that if these caps are not bad now, they will be shortly--so just 
> replace them. The preferred method--used by all "professional" 
> re-builders, is to remove the can, and re-stuff it with individual 
> electrolytics. This is tricky surgery but will result in a receiver that 
> both works properly, as well as preserving original under-chassis 
> appearance.If you don't care about appearance, or future resale value, you 
> can always cobble in some clutter of terminal strips and individual 
> electroly
> tics. This is up to you. In either case, you will have eliminated one of 
> the main trouble spots.
>
> ------------------------------
>
> Message: 3
> Date: Fri, 28 Nov 2014 12:14:02 -0600
> From: barcand at nccray.com
> To: "Charles Ochs" <chuckochs at hotmail.com>
> Cc: "hammarlund at mailman.qth.net" <hammarlund at mailman.qth.net>
> Subject: Re: [Hammarlund] HQ-180 hum in CW mode
> Message-ID:
> <d51625350211c25a0995cfc322b848cc.squirrel at webmail.nccray.com>
> Content-Type: text/plain;charset=iso-8859-1
>
> Of course there is a 3rd option.  Order an exact new replacement
> multi-section can electrolytic from Hayseed Hamfest (google it) and do a
> new replacement. Less work than a re-stuff, cleaner looking than
> under-chassis added caps, but this also will diminish the "original look"
> if you are striving for that aspect. Just a suggestion.
>
> Bernie in ND
> WD0GMD
>
>
> On Fri, November 28, 2014 12:03 pm, Charles Ochs wrote:
>> Sounds to me that you are "closing in" on the problem. A failing filter
>> cap will often be more audible as the 60 HZ content of the B+ will beat
>> against the steady tone of a CW signal.Troubleshooting should ALWAYS 
>> start
>> with the power supply. Can capacitors should ALWAYS be considered
>> "suspects" and must be carefully eliminated before proceeding onward to
>> other things. Without a healthy power supply, the radio can not be
>> expected to operate properly.Given the age of the HQ-180, it should be
>> assumed that if these caps are not bad now, they will be shortly--so just
>> replace them. The preferred method--used by all "professional"
>> re-builders, is to remove the can, and re-stuff it with individual
>> electrolytics. This is tricky surgery but will result in a receiver that
>> both works properly, as well as preserving original under-chassis
>> appearance.If you don't care about appearance, or future resale value, 
>> you
>> can always cobble in some clutter of terminal strips and individual
>> electroly
>>  tics. This is up to you. In either case, you will have eliminated one of
>> the main trouble spots.
>> ______________________________________________________________
>> Hammarlund mailing list
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>> ** For Assistance: dfischer at usol.com **
>>
>>
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>
>
>
>
> ------------------------------
>
> Message: 4
> Date: Fri, 28 Nov 2014 10:26:58 -0800
> From: "Richard Knoppow" <1oldlens1 at ix.netcom.com>
> To: "Robert Sauvan" <rsauvan at beyondbb.com>, "Hammarlund Mail List"
> <hammarlund at mailman.qth.net>
> Subject: Re: [Hammarlund] HQ-180 can capacitor
> Message-ID: <7BE16CD2D1A84B2D91AF20360F6F7155 at VALUED20606295>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=response
>
>
> ----- Original Message ----- 
> From: "Robert Sauvan" <rsauvan at beyondbb.com>
> To: "Hammarlund Mail List" <hammarlund at mailman.qth.net>
> Sent: Friday, November 28, 2014 6:09 AM
> Subject: [Hammarlund] HQ-180 can capacitor
>
>
>> Hi all,
>> I had been working on my HQ-180 replacing this and that
>> and doing a complete alignment. It works fine (better than
>> ever) but I still feel I have distorted cw signals
>> somewhat. I had posted this previously and most pointed to
>> the AVC section of the circuits but I have not located
>> anything amiss there.  I am curious to know whether or not
>> the possibility of one of the caps in my can capacitor
>> might be causing the issue. I always noticed that there
>> was a large electrolytic mounted under the chassis that I
>> thought looked a bit out of place. After digging into it a
>> bit more, It became obvious it was replacing one of the
>> can capacitors. So, this got me to thinking that maybe the
>> can cap is starting to slowly fail and therefore possibly
>> this is my issue with the distorted cw signals. SSB
>> signals sound good. I have made a bunch of resistance and
>> voltage measurements (except at this can cap area) but
>> have not found a spot that is looking really bad. So, any
>> ideas?
>>
>> Thanks-Bob-W0YBS
>
>     The quickest way to check a cap is to replace it. Don't
> bridge another across it because if its leaky that will make
> no difference.
>     Bad filter caps cause all sorts of problems without
> necessarily increasing hum a lot. For instance, one of my
> SP-600s began to have very bad spurious signals, this turned
> out to be one of the filter caps. Also check any cap
> associated with the AVC, the bypass caps must have good
> performance because AVC circuits are usuall rather high
> impedance so it doesn't take much leakage to upset them.
>     Its likely Hayseed Hamfest has direct replacements for
> the original can cap.
>
>
> --
> Richard Knoppow
> Los Angeles
> WB6KBL
> dickburk at ix.netcom.com
>
>
>
> ------------------------------
>
> Message: 5
> Date: Fri, 28 Nov 2014 13:38:25 -0500 (EST)
> From: "L L bahr " <pulsarxp at embarqmail.com>
> To: Richard Knoppow <1oldlens1 at ix.netcom.com>
> Cc: Hammarlund Mail List <hammarlund at mailman.qth.net>
> Subject: Re: [Hammarlund] HQ-180 can capacitor
> Message-ID:
> <101473549.11005352.1417199905393.JavaMail.root at embarqmail.com>
> Content-Type: text/plain; charset=utf-8
>
>
> Bob,
>
> My thoughts are most likely you don't have a bad can cap.  I say that 
> because you say you have the distortion only on CW.  If the can cap was 
> bad I would think you would notice distortion on voice too. (Are you sure 
> you have no distortion on voice?)  That said, it sounds like someone 
> "strapped" an outboard electrolytic across a section of the can cap.  This 
> is bad practice but surely indicates someone was trying to "shore up" a 
> weak can electrolytic. (They do dry out over time.)  If I were you, I 
> would remove the strapped in cap along with the can cap and replace it 
> with a fresh can cap you either rebuild yourself or buy from a dealer 
> selling fresh can caps for your radio such as Hayseed Hamfest.  I would do 
> this even if you had no CW distortion.  (Those original electrolytics were 
> designed with a 6 to 8 year life.)  It's possible this will also repair 
> the CW distortion problem too as the distortion might be more apparent on 
> CW then on phone.
>
> Lee, w0vt
>
>> Hi all,
>> I had been working on my HQ-180 replacing this and that
>> and doing a complete alignment. It works fine (better than
>> ever) but I still feel I have distorted cw signals
>> somewhat. I had posted this previously and most pointed to
>> the AVC section of the circuits but I have not located
>> anything amiss there.  I am curious to know whether or not
>> the possibility of one of the caps in my can capacitor
>> might be causing the issue. I always noticed that there
>> was a large electrolytic mounted under the chassis that I
>> thought looked a bit out of place. After digging into it a
>> bit more, It became obvious it was replacing one of the
>> can capacitors. So, this got me to thinking that maybe the
>> can cap is starting to slowly fail and therefore possibly
>> this is my issue with the distorted cw signals. SSB
>> signals sound good. I have made a bunch of resistance and
>> voltage measurements (except at this can cap area) but
>> have not found a spot that is looking really bad. So, any
>> ideas?
>>
>> Thanks-Bob-W0YBS
>
>
> ------------------------------
>
> Message: 6
> Date: Fri, 28 Nov 2014 12:01:10 -0700
> From: Robert Sauvan <rsauvan at beyondbb.com>
> To: Richard Knoppow <1oldlens1 at ix.netcom.com>, Hammarlund Mail List
> <hammarlund at mailman.qth.net>
> Subject: Re: [Hammarlund] HQ-180 can capacitor
> Message-ID: <5478C676.60905 at beyondbb.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>
> I believe my next step will be to replace the can capacitor. Hayseed has
> them for $35.00 or so but I have some electrolytics that can be mounted
> under the chassis. I know the diehards would just go for the replacement
> can cap but I can do that later. I think I will try the electrolytics I
> have and see what happens. As I have been tuning the bands this morning,
> I am noticing the SSB signals are a bit distorted as well. All I have,
> to compare the sound of this unit, is my HQ-170A. I would assume the 2
> radios should sound fairly similar. If that seems to care care of the
> problem Im done. If not, I will dig into the AVC circuitry again.Will
> let you know what comes out of this.
>
> Thanks-Bob-W0YBS
>
>
> On 11/28/2014 11:26 AM, Richard Knoppow wrote:
>>
>> ----- Original Message ----- From: "Robert Sauvan" <rsauvan at beyondbb.com>
>> To: "Hammarlund Mail List" <hammarlund at mailman.qth.net>
>> Sent: Friday, November 28, 2014 6:09 AM
>> Subject: [Hammarlund] HQ-180 can capacitor
>>
>>
>>> Hi all,
>>> I had been working on my HQ-180 replacing this and that and doing a
>>> complete alignment. It works fine (better than ever) but I still feel
>>> I have distorted cw signals somewhat. I had posted this previously
>>> and most pointed to the AVC section of the circuits but I have not
>>> located anything amiss there.  I am curious to know whether or not
>>> the possibility of one of the caps in my can capacitor might be
>>> causing the issue. I always noticed that there was a large
>>> electrolytic mounted under the chassis that I thought looked a bit
>>> out of place. After digging into it a bit more, It became obvious it
>>> was replacing one of the can capacitors. So, this got me to thinking
>>> that maybe the can cap is starting to slowly fail and therefore
>>> possibly this is my issue with the distorted cw signals. SSB signals
>>> sound good. I have made a bunch of resistance and voltage
>>> measurements (except at this can cap area) but have not found a spot
>>> that is looking really bad. So, any ideas?
>>>
>>> Thanks-Bob-W0YBS
>>
>>     The quickest way to check a cap is to replace it. Don't bridge
>> another across it because if its leaky that will make no difference.
>>     Bad filter caps cause all sorts of problems without necessarily
>> increasing hum a lot. For instance, one of my SP-600s began to have
>> very bad spurious signals, this turned out to be one of the filter
>> caps. Also check any cap associated with the AVC, the bypass caps must
>> have good performance because AVC circuits are usuall rather high
>> impedance so it doesn't take much leakage to upset them.
>>     Its likely Hayseed Hamfest has direct replacements for the
>> original can cap.
>>
>>
>> -- 
>> Richard Knoppow
>> Los Angeles
>> WB6KBL
>> dickburk at ix.netcom.com
>>
>
>
>
> ------------------------------
>
> Subject: Digest Footer
>
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>
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> ------------------------------
>
> End of Hammarlund Digest, Vol 130, Issue 8
> ******************************************
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