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Bird Termaline Model 61 (1 & 5W)

This forum exists for the purposes for discussing service monitors (This includes but is not limited to Motorola, HP, Aeroflex, GD, etc). Additional topics allowed include test procedures, interpretation of test results, where to find information about specific tests, antenna VSWR, return loss testing, duplexer and filter alignment, etc.

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fineshot1
Posts: 913
Joined: Wed Oct 12, 2005 5:13 am

Bird Termaline Model 61 (1 & 5W)

Postby fineshot1 » Thu Sep 28, 2017 10:01 am

Looking for anyone with experience with this old workhorse.
I need to calibrate this great old watt meter. Both scales low
and high are off by about 25%. Some info but not a lot on the
internet and the guy at Bird says it is too old and obsolete
but i still have a good use for it.
fineshot1
NJ USA

Audiotron
New User
Posts: 43
Joined: Wed Apr 05, 2017 5:51 am

Re: Bird Termaline Model 61 (1 & 5W)

Postby Audiotron » Thu Sep 28, 2017 12:24 pm

Hi ,

The times I came across this model measuring incorrectly was with R102 changed..

fineshot1
Posts: 913
Joined: Wed Oct 12, 2005 5:13 am

Re: Bird Termaline Model 61 (1 & 5W)

Postby fineshot1 » Fri Sep 29, 2017 4:43 am

Audiotron wrote:Hi ,

The times I came across this model measuring incorrectly was with R102 changed..


Yes - I measured R102L at about 11.7K and R102H at about 12.7K. Both should be exactly 9.1K
and I have not taken apart the head and not sure about how to do that safely. I am in foggy
territory as to taking this head apart.
fineshot1
NJ USA

fineshot1
Posts: 913
Joined: Wed Oct 12, 2005 5:13 am

Re: Bird Termaline Model 61 (1 & 5W)

Postby fineshot1 » Wed Oct 18, 2017 7:50 am

Today i swapped CR101 and CR102 and had positive results but still not
as accurate as i would expect it to be if it were properly re-calibrated.
Using CR102 in the Hi/Low selection ports gets the accuracy much closer
than before when using CR101. While using the low scale I measured an
HT output on 460Mhz 470 mW and using A General Dynamics R2670A measured
at 510mW. The GD 2670 and Bird 4304 match each other so I am confident that
I am close but no cigar.
fineshot1
NJ USA


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