Re: FW: Cable as shown is what you need
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Andrew - You are a wonderful resource to our group!
Micky KiXH (Group Admin)
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On 2022-08-07 05:27 AM, Andrew Lenton wrote:
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From: Max Donoghue [mailto:ve3tmt@...]
Sent: 06 August 2022 21:41
To: Andrew Lenton
Subject: Re: Cable as shown is what you need
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Some of the satellites have SSB uplink on UHF. Whether I use them or not at least I know the radio is capable.
Thank you for all the help along the way Andrew, I gained lots of experience in troubleshooting from your instructions.
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On Sat, Aug 6, 2022 at 4:20 PM Andrew Lenton <a@...> wrote:
Hi Good news I guess you mean bands, I would trust the meter on the radio, and the current going into the radio!
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Well done
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73
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Andrew
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2020 here of to eat a sandwich
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From: Max Donoghue [mailto:ve3tmt@...]
Sent: 06 August 2022 20:27
To: Andrew Lenton
Subject: Re: Cable as shown is what you need
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I've returned the tx according to the service manual. RF meter on radio now showing 50w.
I think the external meter is not accurate on UHF. Anyway I am very happy with the results.
Now I can work all the birds!
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On Sat, Aug 6, 2022, 3:17 PM Andrew Lenton <a@...> wrote:
Progress, so there were two faults Q4001 was put on by someone else chasing the fault, so we are back to chasing the low RF input
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So with -30 dBm in and 5 Watts out we have 37dB gain I much prefer that!
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So we are only looking for 10dB extra gain. To get 50 Watts
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Check what is coming in on VHF? Should be -20dBm ish?
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73
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Andrew
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From: Max Donoghue [mailto:ve3tmt@...]
Sent: 06 August 2022 20:03
To: Andrew Lenton
Subject: Re: Cable as shown is what you need
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Okay so I just unsoldered Q4001, cleaned the 4 tabs, resoldered and now I am getting 5W out on the meter with the RF power up all the way
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On Sat, Aug 6, 2022 at 2:58 PM Andrew Lenton <a@...> wrote:
I thought you were not getting anything UHF TX wise, what is the level on VHF TX?
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I also thought you were not getting anything out of the UHF VCOs' or do you have signal now there?
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-30dBm seems low, but I may be wrong
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-30dBm to 47dBm (50 Watts), is 77dB gain, on the PA board I am sure with that amount of gain it would hoot! So I feel it should have more coming in hence check what the VHF side is doing level wise?
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I have used professional DTV amplifiers, that go from -15dBm to 300 Watts (54dBm), but these are precision engineered and weigh over 150lbs !! 70dB gain
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73
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Andrew
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From: Max Donoghue [mailto:ve3tmt@...]
Sent: 06 August 2022 19:33
To: Andrew Lenton
Subject: Re: Cable as shown is what you need
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I'm getting -28.9 dBM om the input of Q4001 and -69.9 dBM on the output
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On Sat, Aug 6, 2022 at 2:15 PM Andrew Lenton <a@...> wrote:
Turn the gain to max see if you get any RF coming out
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From: Max Donoghue [mailto:ve3tmt@...]
Sent: 06 August 2022 19:13
To: Andrew Lenton
Subject: Re: Cable as shown is what you need
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I even tried using the HT to inject a signal on the low power setting. Nothing.
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On Sat, Aug 6, 2022 at 1:59 PM Andrew Lenton <a@...> wrote:
Interesting, not sure how much level it requires?
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You could measure the VHF side, see how much TX IF level is, the problem is if it say 50 to 100mW, it will damage the SA without an attenuator
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73
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Andrew
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From: Max Donoghue [mailto:ve3tmt@...]
Sent: 06 August 2022 15:01
To: Andrew
Subject: Re: Cable as shown is what you need
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Just tried a direct coax connection. No change.? HT is picking up the signal from the Tiny SA no problem though.
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On Sat, Aug 6, 2022, 9:47 AM Andrew <a@...> wrote:
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