"Jeff Liebermann" wrote in message
...

At the time, I used a Gertsch FM-something. It's the box with only
the left handle showing at the extreme right of the pictu
http://802.11junk.com/jeffl/pics/Old%20Repeaters/slides/PMC02.html

I can not tell what the Gertsch is from the pix. I have a Singer/Gertsch
FM-10C, but it looks to be older than that. Do see the old generator next to
the scope. I have one like that and play with it from time to time.
Checked the output amplitude of it with my hp 8924c and it seems to be very
close allowing for the fact it is an analog dial and you have to set it to
the mark on the meter.



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On Sun, 26 Jan 2014 10:25:16 -0500, "Ralph Mowery"
wrote:

"Jeff Liebermann" wrote in message
.. .

At the time, I used a Gertsch FM-something. It's the box with only
the left handle showing at the extreme right of the pictu
http://802.11junk.com/jeffl/pics/Old%20Repeaters/slides/PMC02.html

I can not tell what the Gertsch is from the pix. I have a Singer/Gertsch
FM-10C, but it looks to be older than that.

I tried to find a better photo of the generator, but couldn't. It's a
Gertsch FM-7 and DM-3 modulation meter combination, which is partly
shown in the photo. I think it looked something like this:
http://www.ebay.com/itm/141159577401
The Measurements (later Boonton) Model 80 was my "calibrated" signal
source. I let it drift onto frequency using the FM-7, and used it to
measure sensitivity. If left on continuously, it was stable enough
for the old 50 KHz wide band radios.

Do see the old generator next to
the scope. I have one like that and play with it from time to time.

http://www.ko4bb.com/Manuals/09)_Misc_Test_Equipment/Boonton/Boonton_Model_80_Manual.pdf
I still have some acorn tubes for it buried somewhere.

Checked the output amplitude of it with my hp 8924c and it seems to be very
close allowing for the fact it is an analog dial and you have to set it to
the mark on the meter.

I had ours calibrated along with the FM-7. In order to operate in the
UHF commercial band (about 463 MHz), we had to use the 3rd harmonic
through a multiplier. It also lacked FM modulation which I added with
a varactor (varicap) diode. The techs said it was quite accurate and
fairly stable in the UHF region. I also had another RF source
consisting of the exciter chain from an old radio. Not the best, but
since it was crystal controlled, it was at least stable. For the late
1960's and early 1970's, it wasn't a bad arrangement.



--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

"Jeff Liebermann" wrote in message
news
On Sun, 26 Jan 2014 10:25:16 -0500, "Ralph Mowery"
wrote:

"Jeff Liebermann" wrote in message
. ..

At the time, I used a Gertsch FM-something. It's the box with only
the left handle showing at the extreme right of the pictu
http://802.11junk.com/jeffl/pics/Old%20Repeaters/slides/PMC02.html

I can not tell what the Gertsch is from the pix. I have a Singer/Gertsch
FM-10C, but it looks to be older than that.

I tried to find a better photo of the generator, but couldn't. It's a
Gertsch FM-7 and DM-3 modulation meter combination, which is partly
shown in the photo. I think it looked something like this:
http://www.ebay.com/itm/141159577401
The Measurements (later Boonton) Model 80 was my "calibrated" signal
source. I let it drift onto frequency using the FM-7, and used it to
measure sensitivity. If left on continuously, it was stable enough
for the old 50 KHz wide band radios.

Do see the old generator next to
the scope. I have one like that and play with it from time to time.

http://www.ko4bb.com/Manuals/09)_Misc_Test_Equipment/Boonton/Boonton_Model_80_Manual.pdf
I still have some acorn tubes for it buried somewhere.


The Boonton you have is the AM modle. The one I have is the FM modle and
the number is T1035B. From the pix you had it, at first glance it looked
like a differant modle as part of it was hidden. Mine works through the 450
mhz reagon. It does have a scale for something between 800 to 900 mhz that
is not calibrated. Also there is another oscillator that is not calibrated,
but adjustiable that covers some low frequencies of between maybe 3 to 30
mhz. I think that is the one or maybe a later transistorised version that
is shown in some of the old GE Mastr ll books.





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On Sun, 26 Jan 2014 13:20:29 -0500, "Ralph Mowery"
wrote:

The Boonton you have is the AM modle.

Yep. AM only. Someone modified it to look like the Motorola T1034 or
T1035. I found some info and schematics on that series of generators:
http://www.repeater-builder.com/motorola/test-equipment/moto-test-equip-index.html
Search for the T-1034 section. We had three of the Measurements Model
80 generators. One for the service van, one for the shop, and one for
spare parts.

The one I have is the FM modle and
the number is T1035B. From the pix you had it, at first glance it looked
like a differant modle as part of it was hidden.

Sorry. I'll see if I can find a better photo of the shop.

Mine works through the 450
mhz reagon. It does have a scale for something between 800 to 900 mhz that
is not calibrated. Also there is another oscillator that is not calibrated,
but adjustiable that covers some low frequencies of between maybe 3 to 30
mhz.

I hadn't seen any that did that. All the Measurements generators that
we had were AM only.

I think that is the one or maybe a later transistorised version that
is shown in some of the old GE Mastr ll books.

I'll look in my pile of MSTR II manuals tonite.

Drivel: I just found a box of Motorola Buyers Guides from the 1970's
in the office. Office closet archaeology is so much fun.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558