Marconi 2955 Help

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Hotwire
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Marconi 2955 Help

Post by Hotwire »

Good day all,

I have a fairly well taken care of 2955A. I plan on using it to do test/repair/alignment. But.. I failed to recognize the fact that it does NOT facilitate SSB. I do know there is a work around (1kz up or down for LSB or USB and 0% Modulation). Is there anything else I could or should be doing? Any accessories I should look into (attenuators, or cabling)? Also, the N Connector that usually says 75w max as a sticker on it that says 100w Max. I'v never seen this before, has anyone else?

Thanks a ton
Hotwire
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Re: Marconi 2955 Help

Post by Hotwire »

Here is a photo of the 100W sticker,
PXL_20201014_005047713.jpg
I have a radio (set to 10w) connected to the N connector... and I notice a few things.

- First : the SWR is threw the roof
- Second : The 2955 shows only 9mw
- Lastly : When I do a self test, the audio cracles for a few of the tests.

is my 2955 screwed? or am I just not doing things correctly?
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df2tb
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Re: Marconi 2955 Help

Post by df2tb »

Did you already have a look into the manual?
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Otter
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Re: Marconi 2955 Help

Post by Otter »

I've got to be honest - it doesn't sound good. I have a 2965 (not the 2955) and it's pretty much select the right input, select Tx test, connect radio, transmit and measure power etc.
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Re: Marconi 2955 Help

Post by cb4ever104 »

It's been a while since I've used one . Don't these have a self test function ?
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Hotwire
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Re: Marconi 2955 Help

Post by Hotwire »

Yes I read the manual.

It displays the right Freq when I tx into it. So it's still passing the signal threw, I'm just wondering if I have configured something wrong.

It does have the self test feature. I will have to look deeper into that.
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Re: Marconi 2955 Help

Post by Metradio »

Hotwire wrote: 14 Oct 2020, 00:56
I have a radio (set to 10w) connected to the N connector... and I notice a few things.

- First : the SWR is threw the roof
- Second : The 2955 shows only 9mw
- Lastly : When I do a self test, the audio cracles for a few of the tests.

is my 2955 screwed? or am I just not doing things correctly?
Would suspect the cable between the Macaroni and the radio on test...
From memory the audio crackles during Self Test.

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df2tb
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Re: Marconi 2955 Help

Post by df2tb »

May be a daft question but you pressed the blue button labelled TX before starting your measurement?

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Re: Marconi 2955 Help

Post by Edd200sx »

They default to Reciver test at switch on.

You select tx function.

If no power meter after that the attenuators blown probably
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Re: Marconi 2955 Help

Post by bigpimp347 »

self test noises is normal..
on the power and SWR double check the N type connection, they have to be just right..
if mines not just tight enough but not too tight it fails to read.

also if it's been stood a while work the relays a few times,press the N and BNC selector a few times to clean the relay.
lastly, give it time to warm up, 15 minutes usually..
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