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There was a reason the power supply fuse popped. Check voltages there first. Gary W0DVN

The same on all bands. The max peak in TUNE mode is closer to 80mA, not 100mA. protonmail.com_at_groups.io_lastradioman@...> wrote:

Are the other bands working?

My L7 had a shorting trace as well but I chose to remove the filter because that was where I mounted the step start, soft key and bias board at.

Group, I'd welcome any advice on where to start looking. The 5A fuse on the AC4 blew in my absence. Replaced the fuse, and cannot get a peak greater than 0.1A when switching from SSB to tune,

On one L7 that I serviced it had a "shorting" trace on the 11M filter? On Wednesday, December 25, 2024 at 07:38:24 AM EST, Roger KW4EMF <rogerlhill@...> wrote: Yes it had the band pass

This morning I confirmed that the band switch that switches the 10 volts to either the low VCO or the high VCO is working just fine. Any other ideas why on 15 and 10 meters the display is reading 51

Gang… I have a R8 sitting on my desk I got from a local ham. He went through it and replaced several handfuls of capacitors. The encoder was shot so he machined a new coupling to fit an off the

Peter, look for parts that are used only on 40m. These include various capacitors and inductors as well as a few resistors. Did you smell any smoke before this happened? I had one TR-4C that had a

I cleaned the pins and sockets on the VCO board today as well as the pins on the main board and saw no change. Have not figured out the best way to clean the band switch. 73, Jim Ve1RB

My TR-4C works fine on all bands with the exception of 40. Sensitivity is very low as if the antenna was unplugged, hum is heard in the speaker, and there is no ouput. The S1B-C section of the

Steve & Group, Found the answer: After email with Frank @ Noble, I learned that he'd designed the 450 and 250 CW filters with a slight offset that puts the filters on the LSB side of the PBT. 73 Jay

It's been a few years but IIRC I used a dental pick to coax the nut off and then popped the screw out. "Roger KW4EMF via groups.io" <rogerlhill@...> wrote: -- 73 -Jim NU0C

It doesn't say how to get that little stop screw out of the band switch. I can see it. But don't see any way to access it short of removing the band switch.?Sent from my T-Mobile 5G Device

They are both the same! Joe – W7RKN From: [email protected] [mailto:[email protected]] On Behalf Of Clayton kk4iz via groups.io Subject: Re: [DRAKE-RADIO] Drake AC-4 supplies do you have a

do you have a l4b or ?L-7 power supply ??

Tim,I’m interested in your AC-4s. I sent you an email through QTH. ?BarryKJ5GQM

I just added a capacitor to mine, that’s all it took. My SWR is 1.1 to 1.3 across entire 10m band with solid 1kw out and 60w exciter. Note: I did not add a capacitor to the 15m pi network as it

The way to check narrow filters and the IF alignment is to zero beat a signal and set the PASSBAND knob to 12 o’clock. Maximum signal strength should occur with the pointer at 12 o’clock. If this

Group- I've installed the set of three Noble CW filters in my R4C, and I like them. I have noticed that if the 500 or 250 CW filter is selected, the passband center is no longer at zero (12 o'clock) -