[TenTec] ARGONAUT 515 problem

[Carl Moreschi]

I still say it is normal and SB-N on 80 meters is USB by design.

Carl Moreschi N4PY
58 Hogwood Rd
Louisburg, NC 27549
www.n4py.com

On 9/5/2016 11:02 AM, Tim wrote:
> Hi Rick,
>
> This now sounds like a dirty switch contact.
>
>
> Tim
> KE4KE
>
>
> On 09/05/2016 09:58 AM, rick at dj0ip.de wrote:
>> I haven't taken the radio apart yet, Lee.
>> Yes, the LSB pin has a direct connection to +12v through a pull-up
>> resistor,
>> and the mode switch grounds the pin for SB-R.
>>
>> Last time I worked on Argonauts I had a scope, VTVM, signal generator,
>> freq.
>> counter, etc.
>> Today I only have a DVM and a freq. counter.
>>
>> What's blowing my mind is that it works normal on 40m and reversed on
>> 80m.
>> I can't see how the band would have anything to do with it.
>>
>> I can borrow a scope from our ham club and perhaps use a QRP rig as a
>> signal
>> generator.
>> I need to check how high the impedance is on my DVM. Dunno if I can use
>> that instead of a VTVM or not.
>>
>> There's always a reason and once you find it, it usually makes sense.
>> Right
>> now it makes no sense to me.
>>
>> 73 - Rick, DJ0IP
>> (Nr. Frankfurt, Germany)
>>
>>
>>
>> -----Original Message-----
>> From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Lee
>> Sent: Monday, September 05, 2016 4:49 PM
>> To: Discussion of Ten-Tec Equipment
>> Subject: Re: [TenTec] ARGONAUT 515 problem
>>
>> Congratulations on getting a 515 Rick. Bet you'll have lots of fun
>> with that radio.
>>
>> You are correct about leaving the mode switch in "Normal" position on all
>> bands normally...hehe.
>>
>> You probably found the problem by now but if not, check the voltage at
>> "LSB"
>> on the SSB GENERATOR board. It should be a positive voltage in "NOR" mode
>> and ground in "REV" mode. Doesn't look to me like that changes on any
>> band.
>>
>> 73,
>>
>> -Lee-
>>
>>
>> ------ Original Message ------
>> From: "rick at dj0ip.de" <Rick at dj0ip.de>
>> To: n4py3 at earthlink.net; "'Discussion of Ten-Tec Equipment'"
>> <tentec at contesting.com>
>> Sent: 9/5/2016 8:14:20 AM
>> Subject: Re: [TenTec] ARGONAUT 515 problem
>>
>>> Gm Carl,
>>>
>>> It's the other way around by me. I leave it in "Normal" for all bands
>>> except 80m. On 80 I have to switch to Reverse. I have owned 4 pyjrt
>>> Argonauts including one other 515 and none of them worked like this.
>>>
>>> 73 - Rick, DJ0IP
>>> (Nr. Frankfurt, Germany)
>>>
>>>
>>> -----Original Message-----
>>> From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Carl
>>> Moreschi
>>> Sent: Monday, September 05, 2016 1:52 PM
>>> To: Discussion of Ten-Tec Equipment
>>> Subject: Re: [TenTec] ARGONAUT 515 problem
>>>
>>> Rick, I think this is normal. The mixing scheme works such that LSB
>>> comes out as normal on 80 meters. I seem to recall that my Omni A
>>> worked the same way. I think they use the same crystal for 20 and 80
>>> meters to get to the IF and this yields USB on 20 meters and LSB on 80
>>> meters.
>>>
>>> Carl Moreschi N4PY
>>> 58 Hogwood Rd
>>> Louisburg, NC 27549
>>> www.n4py.com
>>>
>>> On 9/4/2016 10:51 PM, rick at dj0ip.de wrote:
>>>> Meanwhile, back at Ten-Tec . . .
>>>>
>>>>
>>>>
>>>> I have just received an Argonaut 515 in fairly good shape, just
>>>> needing a tune-up.
>>>>
>>>> However it does have one minor issue which has me stumped.
>>>>
>>>>
>>>>
>>>> On 80m I could hear lots of strong signals but all sounding like
>>>> Donald Duck.
>>>>
>>>> I switched to SB-R which should normally place the rig in USB mode
>>>> and
>>>> everything worked just fine.
>>>>
>>>> On 40m, and all other bands, I switch back to SB-N and everything is
>>>> fine.
>>>>
>>>>
>>>>
>>>> I haven't checked transmit yet to see if the wrong mode is only
>>>> selected in RX or if it is also during TX.
>>>>
>>>>
>>>>
>>>> What is curious to me is, the mode switch is labeled for SB-Normal
>>>> and
>>>> SB-Reverse, yet the signal input to the SSB generator board for
>>>> switching these is simply called LSB.
>>>>
>>>>
>>>>
>>>> What I am unable to find is how the position of the bandswitch can
>>>> pass a signal through the mode switch to tell it when to enable or
>>>> disable this LSB line. That must be the source of the problem.
>>>>
>>>>
>>>>
>>>> I believe this is very similar to the Triton IV so perhaps someone
>>>> with that radio understands how this works.
>>>>
>>>>
>>>>
>>>> Tnx.
>>>>
>>>>
>>>>
>>>> 73
>>>>
>>>> Rick, DJ0IP
>>>>
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