It was 20 that was backwards but the general idea is valid.?
I do remember trying to tune up on 20 and seeing that the settings seemed really ¡°off¡±. Yeah, that will happen when you¡¯re tuning at 14.450¡
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Sun, Mar 31, 2024 at 15:45, Evan via groups.io <
k9sqg@...> wrote:
The RV-75 was part of the TR-7, called the 4310.
On Sunday, March 31, 2024 at 02:14:27 PM EDT, Rob Sherwood <rob@...> wrote:
What I didn¡¯t like about the old mixing scheme was my TR-4 and later TR-4C tuned backwards on 80m. This complicated the frequency scales of the discs immensely.?
By the time the TR-4Cw with RIT came along the old-style mixing method could have been replaced, but that wasn¡¯t Drake¡¯s style of management.?
?
For instance the DR-7 board of the TR-7 could have been simplified to a few chips.? Why didn¡¯t the RV-75 ever show up in a TR-7 or R-7?? The R-4C power supply
could have been updated by the factory like my RPS-4 board. ?The L-4B power supply needed updating like Harbach and others did.?
?
Sadly slow to react US amateur OEMs faded away with Ten-Tec the last of the vintage US companies.? Flex and Elecraft revived the US OEMs though the larger volume
OEMs are still out of Japan.?
?
With software (firmware) running all current products, it is interesting to see the variation in software stability across different brands.
?
Rob, NC0B
?
From: [email protected] [mailto:[email protected]]
On Behalf Of Rick W4XA
Sent: Sunday, March 31, 2024 11:49 AM
To: [email protected]
Subject: Re: [DRAKE-RADIO] Those of us members in the HALF Century (or more) Wireless Association
?
Manufacturers meaning Drake, right??
The majority of the others, Collins, Heath, Hallicrafters, Sideband Engrs, National? used single SSB filters and selectable crystal carrier/BFO oscillators to move the suppressed carrier frequency from one side of the filter passband to the other while without
shifting the final output frequency.
Swan (single filter)? put a USB/LSB "line" on the 350/500 VFO readout so you could retune when switching. (the 350 didn't even allow you to switch)? And many of their radios sideband switching selector was labeled "NORM/Opposite" to keep the myth going
Never did understand why Drake (one of the few "odd men out") used 2 filters.? Later even Kenwood and Icom and I think Yaesu used only 1 SSB filter Although many Yaesu radios (like Swan)? needed to retune to get back to the original freq.
The phasing transmitters did a simpler and better job of staying on the same suppressed carrier frequency!
"NORM" should have always been upper sideband!? But as always,? I digress!!
On Sun, Mar 31, 2024 at 05:12 AM, Steve Wedge, W1ES/4 wrote:
And yet, for some reason, manufacturers maintained this configuration, necessitating the use of an extra filter ¡ª which is by far more expensive than two simple crystals.?
Time flies like an arrow. Fruit flies like a banana.
?
--
73/Rick
W4XA
*Every post is created using Linux
