[Test-Equipment] RF spectrum analysis

Mon Jan 20 15:15:18 EST 2014

Brian doesnt need another one yet. Maybe when he leaves Tbilisi Georgia in 
July.

Glad to here youre still moving along with those projects.

I can give you an intro to Joe Walsh, he may be able to point you to some 
customers.He is also into home brewing gear.

Carl
KM1H

----- Original Message ----- 
From: "Brian Burns" <brian at lessonsinlutherie.com>
To: "'Discussion of Electronic Test Equipment'" 
<test-equipment at mailman.qth.net>
Sent: Monday, January 20, 2014 2:52 PM
Subject: Re: [Test-Equipment] RF spectrum analysis

> Hey Carl,
>
> Buy your son one of my flamenco guitars so that I can afford some good 
> test
> equipment!
>
> Cheers,
>
> Brian
>
> -----Original Message-----
> From: test-equipment-bounces at mailman.qth.net
> [mailto:test-equipment-bounces at mailman.qth.net] On Behalf Of Carl
> Sent: Monday, January 20, 2014 11:36 AM
> To: Discussion of Electronic Test Equipment
> Subject: Re: [Test-Equipment] RF spectrum analysis
>
> I didnt find a need for a TG at HF, just use Max Hold. I started with a
> cheap $50 used Wavetek sweeper from a hamfest that provided up to 4 
> markers
> and a counter is all that is needed to assure accuracy or align it.
>
> The 141T  8553B 0-110 MHz plug in also has a 0-11 mHz select that makes
> doing filters and IF's a snap.
>
> For a cheap signal generator the URM-25D is OK but not very stable for the
> higher frequencies and is a PITA to do an overhaul. Unknowns are $50-100
> while a properly rebuilt one can run $150 and up. Many are also missing 
> the
> adaptors that are mounted in the cover. I retired mine about 15 years ago
> and paid $50 for a HP-606A which was what National Radio used even for the
> HRO-500 and military gear in the 60's.
> A fairly simple overhaul and alignment.
>
> I also have an 8640B which is a pita to use and has many weaknesses which 
> is
> why they are so cheap. I parked mine for anything under 60 MHz and picked 
> up
> another hamfest 606A for $40 which was an easier overhaul. I use the pair
> for IP3 and other measurements as well as having 2 signals when doing
> tracking, saves a lot of time.
>
> The HP 8568B is a good SA if you can find one. We used them at a few 
> places
> I worked and a dim to unviewable CRT sent them to scrap since a new CRT 
> cost
> more than the unit was worth. Of course HP offered a great trade in on a 
> new
> model.
>
> Carl
> KM1H
>
>
> ----- Original Message -----
> From: "W2HX" <w2hx at w2hx.com>
> To: "Discussion of Electronic Test Equipment"
> <test-equipment at mailman.qth.net>
> Sent: Sunday, January 19, 2014 10:02 PM
> Subject: Re: [Test-Equipment] RF spectrum analysis
>
>
>>I agree too, but he will also need a TG. That will probably bring the 
>>total
>
>>cost up
>>
>> -----Original Message-----
>> From: test-equipment-bounces at mailman.qth.net
>> [mailto:test-equipment-bounces at mailman.qth.net] On Behalf Of Francesco
>> Ledda
>> Sent: Sunday, January 19, 2014 9:28 PM
>> To: Discussion of Electronic Test Equipment
>> Cc: Discussion of Electronic Test Equipment
>> Subject: Re: [Test-Equipment] RF spectrum analysis
>>
>> Agree 100%.  There is no need to buy a Chinese toy, when you can get a
>> good and high quality US made unit!
>>
>> KF5rxv
>>
>> Sent from my iPad
>>
>>> On Jan 19, 2014, at 7:50 PM, "Carl" <km1h at jeremy.mv.com> wrote:
>>>
>>> Find a working HP-141T system, vintage but a decent SA for ham use. I
>>> used one on the workbench about 12 years and now its used for TX
>>> monitoring.
>>> They all need a bit of  TLC as caps dry out and take SS parts with them.
>>> Only the CRT is in the unobtainium category so be sure it is nice and
>>> bright. Its better than paying $3-4K for a newer HP prone to the same
>>> issues and has proprietary parts. The 141T is all discrete components,
>>> ie: transistors, diodes, cap, etc.
>>>
>>> The only thing you will find somewhat reasonable for a VNA is one of the
>>> kits that work with a PC. Not cheap but less pizzas needed.
>>>
>>>
>>> ----- Original Message ----- From: "Brian Burns"
>>> <brian at lessonsinlutherie.com>
>>> To: "'Discussion of Electronic Test Equipment'"
>>> <test-equipment at mailman.qth.net>
>>> Sent: Sunday, January 19, 2014 7:35 PM
>>> Subject: Re: [Test-Equipment] RF spectrum analysis
>>>
>>>
>>>> Hello Ron,
>>>>
>>>> ~ Maybe something like this will work for you
>>>> http://groups.yahoo.com/neo/groups/PHSNA/info
>>>> This is a current project and pretty simple to build, still evolving
>>>> but very functional right now.
>>>>
>>>> That certainly looks like what I've had in mind. However my building
>>>> experience is from all the way back in the 1950's, and programming is
>>>> way over my pay grade! Do you mean I'm finally going to have to wrap
>>>> my mind around a "flow of holes"?
>>>>
>>>> Cheers,
>>>>
>>>> Brian
>>>>
>>>>
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